Demon Slayer AU : The Final Battle

by Asperger Hero

Spin off from Academy of the Omniverse Phase 2 where the Ultimate Multiverse Smash Bros Squad join forces with new heroes from the Multiverse to destroy Muzan once and for all and save the Multiverse ! Rated M for extreme gore scenes, Muzan god-complex and the Darker and Edgier world of Demon Slayer ! (Obviously !)

14. Saving the Multiverse, Muzan's Endgame !

(Academy of the Omniverse)

While the heroes are taking a necessary rest, back there, the attacks from the demons and other enemy troops are stopped but the defense barrier is still there while Ashton checks his phone which has a timer marking 2 hours and half before the dawn in the Taisho period.

"Only this time remains before dawn." Ashton whispered.

(Infinity Castle)

Now with Tanjiro it is incredible for him that all the Hashiras are alive which is 100 hundred times better and now with more heroes they have more chances to win and defeat Muzan.

"I'll set my heart ablaze during the battle!" Tanjiro heard Aidan's voice seeming like Kyojuro Rengoku inside his head.

Tanjiro's heart skipped a beat as he heard Aidan's voice, echoing Kyojuro Rengoku's signature catchphrase. The words "set my heart ablaze" carried a sense of determination and courage, with him alive he had more determination as he clenched his fists, a deep sense of purpose flickering in his eyes.

"I will too." He thought, his voice filled with conviction.

"I know what Giyu had gone through, he has low self-esteem after the deaths from his sister Tsutako and his friend Sabito, he just needed someone to help him." Tanjiro's heard Assana's voice, being the Water Elemental represents her personality like modesty and loyalty, also with Sabito revived, Giyu has now more confidence during the battle.

Tanjiro's heart ached hearing Assana's words about Giyu. He knew his fellow Water Hashira struggled with loneliness and self-doubt, stemming from the death of his sister and friend Sabito. The idea of Sabito being revived filled him with hope, knowing the positive impact it would have on Giyu's psyche. He was grateful to Assana for recognizing Giyu's plight and knowing exactly what he needed.

"Your brother Sanemi is just trying to protect you, even if he seems harsh and firm most of the time." Tanjiro heard Blake's voice when he was speaking with Genya.

Tanjiro listened intently to Blake's words, sensing a depth of understanding in his voice. He knew that Sanemi had a tough exterior, but deep down he cared for his younger siblings, Tanjiro and Genya, in his own way. The realization that Blake saw through Sanemi's harshness and saw the protective older brother underneath made Tanjiro appreciate his fellow Wind Hashira on a deeper level.

"You know, Sanemi was shocked and surprised when I managed to perform the Wind Breathing skills with my fans, also it is funny when Sanemi blushes every time Kanae hugs him." Skye's voice said with her gigglings inside Tanjiro's head.

"Despite Sanemi looking harsh and having anger issues, Kanae is there to soothe his emotions, they are the perfect couple." Tanjiro heard Cancer's voice, being the most sensitive girl of the Zodiac Warrior Girls.

Tanjiro chuckled hearing about Sanemi blushing when Kanae hugged him. It was a stark contrast to his usual stern demeanor. He knew that behind Sanemi's angry facade was a softer side that came out when he was with the ones he cared about. Cancer's comment about Sanemi and Kanae being the perfect couple confirmed what he already thought. They had a way of balancing each other out, and it was clear that they brought out the best in each other.

"At the beginning Obanai didn't trust anyone, since his childhood he lived in a family of pure women, bandits too, all of them were allied with a snake demon, when Obanai escaped the snake demon killed his whole family and tried to kill Obanai but he was saved by Kyojuro's father, however his only and surviving cousin blamed Obanai and told him that he must die, later he was adopted by Mr. Rengoku and even in the life as a Demon Slayer, Obanai still feels the claws from his late family trying to drag him to hell, eventually Obanai learned to trust everyone specially Mitsuri." Tanjiro heard Aries' voice in his head explaining about Obanai's backstory.

"All the spirits of Obanai's late family are trapped in my doll where those damned souls will live in torture." He heard Blake's voice said in his head.

"Knowing that you saved Mitsuri from Zohakuten, I'm sure Obanai will trust you." Scorpio's voice told him in his head.

"Also we told Obanai that you have a crush with Kanao, meaning that Obanai won't be jealous when you're with Mitsuri as a friend." He heard Cancer's voice again.

Tanjiro absorbed the information Aries provided about Obanai's backstory. He had no idea that Obanai's childhood had been so traumatic. The details about his cousin and the snake demon filled Tanjiro with sadness. Cancer's mention of his crush on Kanao was a bit embarrassing, but the reassurance that Obanai wouldn't be jealous when he was around Mitsuri as a friend eased his mind.

"Knowing that Gyomei is religious like me, it was easy befriending him, also Gyomei is fond of the children just like my little brother Uriel." He heard Taurus' voice in his head.

Tanjiro smiled at Taurus's words. He could imagine that Gyomei, as a religious person, would get along well with Taurus, who also seemed to share similar values. The mention of Gyomei being fond of children reminded Tanjiro of how gentle the Stone Hashira could be despite his imposing size and strength.

"At the beginning Muichiro was emotionless and sometimes cold, but he gained that personality when his twin brother Yuichiro died succumbing to wounds caused by a demon in the past, but after the battle on the Swordsmith Village, Muichiro came back to his compassionate, cheery and optimistic personality." He heard Alban's voice explaining about Muichiro in his head.

Tanjiro's heart ached for Muichiro upon hearing Alban's words. He had no idea that the Mist Hashira had lost his twin brother in such a cruel way, and that his personality had changed as a result. But the thought of Muichiro regaining his cheerful and optimistic personality after the battle at the Swordsmith Village brought a sense of hope to Tanjiro.

"The Demon Slayer's uniform of Mitsuri is revealing because it reveals the center of her chest, however Mitsuri doesn't look bothered by that." He heard Libra's voice in his head.

"Remember me to knock out Maeda, I should call him Kakushi Senile Pervert." He heard Seth's voice, referring to the Kakushi who created Mitsuri's uniform.

Tanjiro's cheeks flushed at the mention of Mitsuri's revealing uniform. It wasn't something he had noticed before, but now that it was pointed out to him, he couldn't help but think it was a bit... distracting. The comment about the Kakushi who created the uniform was amusing, and Tanjiro chuckled at the idea of someone knocking out Maeda for creating such a revealing outfit for the Love Hashira.

"It's surprising that Shinobu and Kanae know a lot about medicine, even Kanae was able to cure Kanao when she was catatonic." He heard Keith's voice, the Wood Elemental who revived those ones who were killed by the demons.

Tanjiro smiled at the thought of Shinobu and Kanae's medical expertise. The fact that Kanae had been able to cure Kanao when she was catatonic showed just how talented the older Kocho sister is. Tanjiro appreciated the reminder of how skilled the Kocho sisters were in the field of medicine. Their knowledge had proven invaluable in the past, and he knew they would continue to be an asset in the future.

"Shinobu and I are very close friends, apart that she is my brother Seth's girlfriend, she always is there to comfort me like she is a big sister, even I like that butterfly hair ornament in Shinobu's hair, also when she met Seth she started to change, her smile is becoming more sincere." He heard Aria's voice, reminding that sometimes Shinobu can be angry despite keeping her usual smile, just like Kanae.

Tanjiro smiled at Aria's mention of her friendship with Shinobu. The idea of Shinobu being like a big sister to Aria was heartwarming, and he appreciated the thought of how Shinobu had changed since meeting Seth. He also chuckled at the mention of the butterfly hair ornament in Shinobu's hair. It was a fitting accessory for the Insect Hashira, symbolizing her delicate and yet deadly nature.

"Sometimes it is surprising to hear that Uzui has three wives." Luke's voice said, Caleb's big brother, referring to Makio, Hinatsuru and Suma. "Surely they will have a big family in the future."

Tanjiro chuckled at Luke's comment about Tengen having three wives. The Sound Hashira's personal life was certainly unique, and the idea of him having a large family with Makio, Hinatsuru, and Suma was amusing yet heartwarming. Tanjiro appreciated the lighthearted moment, and it served as a reminder that even in the midst of a dangerous fight against demons, moments of joy and laughter were still possible.

"Tanjiro, are you ready?" Caleb asked him, referring to going in facing Muzan, not only to end the reign of terror of the King of the Demons, but better known as the King of the Cowards and after the battle, new memories will be created back with his family.

Tanjiro nodded his head, a solemn yet determined look in his eyes. The time had come to face off against Muzan Kibutsuji, the one responsible for so much pain and suffering across 1,000 years. He knew that the battle ahead would be difficult and dangerous, but he was ready for it. For the sake of his family, his friends, and all the innocent people who had suffered because of Muzan, Tanjiro was prepared to do whatever it took.

"Yes, I'm ready." Tanjiro with his firm voice answered Caleb's question. "Are you ready as well?"

He knew that they were going to face off against Muzan together, and he wanted to make sure that his comrade was truly prepared for the challenge ahead.

"I'm ready as I'll ever be!" Caleb said with determination to change the destiny of everyone who live in Japan from the Taisho Period. Tanjiro smiled at Caleb's words. The determination in his voice was reassuring, and it made Tanjiro even more confident in their chances of success.

"Let's do this then. Together, we'll change the destiny of everyone in Japan and put an end to Muzan's reign of terror." Tanjiro replied with a firm nod.

"I always wanted to say that." Caleb said.

Tanjiro chuckled at Caleb's words, understanding the lightheartedness in his tone. Despite the gravity of their situation, a bit of humor and levity was appreciated, he patted Caleb on the back, encouraging him.

"I had a feeling you'd been wanting to say that for a while." Tanjiro added.

*Sonic vs Shadow (Sonic Adventure 2)*

Now it's decided, the group of Caleb was now made by the Zodiac Warriors, Elemental 10, Corona, Winter, Krisi, Tanjiro, Magnamon X, shiny Mew, Luke, Wingdramon, Aria, Crescemon, Seth, Flaremon, Giyu, Kyojuro, Tai with WarGreymon, Matt with MetalGarurumon, Davis with Imperialdramon Swordfighter Mode, Takato with Guilmon Bio-Emerged into Gallantmon, Takuya as Aldamon, Koji as BeoWolfmon, Marcus with ShineGreymon Burst Mode, Mikey and Christoper with Shoutmon DX, Tagiru with Arresterdramon, Haru with Gaiamon who is a white and armored version of himself with a ring similar to the one of Arceus, Hiro with Siriusmon who is an armored and winged version of himself wielding a blaster in the left arm and a sword in the right arm, Mario, Luigi, DK, Link, Samus, Pit, pink Kirby, Meta Knight, Fox, Falco, Matt Sterling, Captain Falcon, Ash with Pikachu, Gaiomon, his Articuno, Marshadow, Latias, Azelf, Charizard, Pidgeot, Snorlax, Kangaskhan, Kingler, Butterfree, Lapras, Machamp, Heracross, Tyranitar, Sceptile, Glalie, Garchomp, shiny Corviknight (obtained after trading one of the Tauros), Gengar and Lucario, Gary has Ouryumon, Blastoise, Tyranitar, Hatterene, Scizor, Pinsir, Houndoom and Alakazam, shinies Typhlosion, Meganium, Feraligatr, Marth, Roy, Ike, Ness, Shulk, Pyra, Raiden, Mega Man, Mega Man X, Ryu in his Ranger form, Sonic, Shadow, Silver the Hedgehog, Chris Thorndyke with VictoryGreymon, Firion, Luneth, Cecil Harvey, Bartz Klauser, Terra Branford, Cloud, Leon (Squall), Zidane, Tidus, Bayonetta, Ren Amamiya as Joker, Luminary, Erdrick, Solo, Eight, Terry Bogard, Steve equipped with a Netherite armor, Shantae, Jin Kazama, Sora with his Oshawott, Riku with his shiny Litten, Bomberman, Yugo in his werewolf form, Lloyd, Strider, Siegfried, Demitri, Ratchet with Clank, Jak with Daxter, Sly Cooper, Dante, Nariko, Sir Daniel, Spike (Ape Escape), Cole MacGrath, Big Daddy, Kratos, Kat with Dusty, Emmett Graves, Isaac Clarke, Rash, Master Chief, Alex Mercer, Ryu Hayabusa, Ezio, Chris Redfield, Hanzo Hasashi, Sub-Zero, Ruby Ross, Goku, Luffy, Toriko, Naruto, Sailor Moon, Sakura (English), Yugi as Yami, Pegasus Seiya, Ryo of the Wildfire with White Blaze, Yusuke, Gon, Jotaro, Kenshiro, Kenshin, Inuyasha, Edward, Natsu, Ichigo, Kirito, Asta, Meisuke Nueno, Medaka Kurokami, Tsunayoshi, Deku, Meliodas, Cole as the Red Savage Ranger, Mickey Mouse, Buster Bunny, Samurai Jack, Mane Six, Korra Mei-Ling, Damian Noctis, Ace the Ice Hero with his own Articuno, Mike Andrew, Timothy Murdock, Scott Todoroki, Matt Shimura, Ace Murphy, Ky, Nex, Noel and Pax, most of the main ones from their worlds and experienced heroes are there with Tanjiro advancing through the fortress, however Tanjiro was feeling anxiety knowing that all the Hashiras were saved but the worst is going to happen knowing that their next opponent will be Muzan.

'They are alive, don't let down your guard, focus Tanjiro, focus!' Tanjiro told himself in his thoughts as he kept running.

They continued across the fortress.

*Ends*

When the Demon Slayers of minor rank arrived at the whereabouts of Muzan, they saw a flesh cocoon that held the King of the Demons, the kasugai crow told them to stand down all, but too late.

*Facing a Crisis (Hyrule Warriors)*

Muzan burst through it and flew up high into the air above his temporary holding container, however, he adopted a more monstrous and battle-esque form, with a dark-red scale-like mass covering most of his body (prominently on his limbs, his forehead, and the entirety of his lower body), sharp-toothed wide mouths all over of his body, and longer pale white hair. Looking like he had just stepped out of a vat of blood, he set his gaze on the slayers and showed no mercy by ripping and tearing them apart limb from limb with both his hands and feet. The mouths made quick work of their human flesh as well, shredding and eating it as soon as the teeth made contact.

It was truly a slaughter, and it all happened in the mere blink of an eye. The helpless Ubuyashiki family survivors leading the operation could do nothing to prevent every single member sent there from being cut apart or devoured by the Demon Lord, not even a lone Kasugai crow that tried to flee the scene was spared from the carnage, no one has died until right now.

"After living over a thousand years, I'd lost the sense to taste food… but now that I'm starving, it's very delicious…" Muzan murmured with a light chuckle as the mouths across his body used their long, forked tongues to lap up the human blood splattered across his skin. "You're deliberately sending food straight to me… my compliments, Ubuyashiki."

Muzan licked his lips and then held up his right hand, a messy clump of hair sprawled around it. It was Tamayo's head, with just what was just above where her chin used to be left. His thumb was now pierced deep into her left eye socket, and pieces of her blood flesh were falling away little by little. She had tried with all of her might to resist being absorbed by Muzan, but in the end, it was a futile gamble. Now, with a vicious sneer, Muzan was victoriously holding her head as if it were a prize he had just won.

"How is it, Tamayo? Even the 'turn a demon into a human' medicine you used still had no effect." Muzan chortled, Tamayo's raspy breaths like music to his ears.

"You're… going to fall… into hell…" She wheezed. Muzan's temple throbbed slightly as her veins bulged out, the resistance of Tamayo still put up to his will, getting on his nerves.

"So far, hundreds of humans have said that to me. But it's never happened, I'm sorry to say." He sadistically said.

"My… husband… and children… give them back…" Tamayo whispered, tears beginning to come from her one remaining right eye.

"Then die right now. Go to the side of the family you yourself slaughtered." Muzan told her.

With a loud bone-snapping noise, he crushed what remained of her head in an instant with his fist giving her an instant and merciless death. As this happened, Muzan unleashed himself upon the barely warned Demon Slayers who weren't able to hear Kiriya's order to retreat in time. Even when they did, they were unable to escape the carnage that had been unleashed upon them. Like a natural disaster of epic proportions, Muzan shredded through their ranks with extreme prejudice. Gallons of blood were spilled in mere moments as the awakened Demon Lord went on a rampage. He was going to personally bring an end to the meaningless struggle that's been a thorn in his side for far too long.

"First, the slayers but mainly the Hashiras, those Zodiac Warriors, Elemental 10 and Aether Team, then I'll personally capture Nezuko myself and absorb her. Then… I'll truly have become the most perfect being imaginable." Muzan said.

A Demon Slayer swung his sword and tried to behead Muzan from behind but his sword broke at the contact with the neck and rapidly Muzan lunged his right hand and then his upper half of his body was mutilated and devoured by Muzan. At the same time Muzan realized that most of the heroes prevented the deaths.

"It's time to use my new gifted power!" Muzan said as he manifested Tabuu's mark in his left palm.

Then all the demons and even Nakime manifested Tabuu's power thanks to Muzan's blood in their bodies and the fourth Upper Moon used the power of Tabuu manifested in the mark of her left palm which managed to destroy the canceling spell and then played her biwa multiple times sending a lot of structures waiting to crush the heroes and separate them from each other.

*Ends*

(Mount Sagiri)

Now back there, Kiriya was at an utter loss. His skin felt clammy from the sweat dripping off it, and terror gripped his heart so firmly it felt like he was suffocating. Hearing the deaths of his parents, and now his through inheritance, children at the hands of Muzan was like he was getting repeatedly punched in the gut, part of him wanted to quit because no one has died until Muzan emerged and killed most of the Demon Slayers.

'I didn't make it in time. It's my fault. I failed to give the right commands. Now a lot of people have lost their lives because of it.' He thought to himself as he spiraled deeper and deeper into despair, his hands were shaking and he could barely hear the voices of his sisters reaching out to him. 'Everyone strove hard for hundreds of years for this day. And everything we did to defeat Muzan… it's all my fault that it's now…"

"Kiriya!" Just as Kanata exclaimed she fiercely slapped him, bringing him out of his own head and sending him toppling to the floor, their other siblings couldn't help but gasp and cover their mouth with their hands.

Kiriya was left dazed by the slap, and almost instantly the pain set in that really made him come back to his senses.

"Keep yourself together, master! Give your next orders now!" Kanata shouted right in his face, the shaken Kiriya cupping his rapidly swelling cheek and staring at her in awe. "The fight isn't over yet!"

Despite everything they're going through, he silently thanked his sister for bringing him back from the brink. He had momentarily stared into the abyss, and now that he was back, he had a renewed sense of determination to see the wishes of his ancestors through to the end. With one quick glance over the maps assembled before him on his table, he had his orders.

"Keep sending reinforcements to Muzan's location. Have the crows spread more 'eyes' out. He has an incredibly wide attack range, so make sure not to get too close to him." Kiriya said firstly before pausing to wipe some blood away from his lips, the stinging pain in his cheek doing little to dissuade him from carrying out his duty. "Gather the Hashira at once, and all other members, even the otherworldly heroes. We're going to focus all our manpower on one place immediately."

When his sisters returned to their posts behind him, he thanked them for being there at his side even during that temporary moment of weakness. He was going to need them, more than ever, to help pull him through to the end.

(Infinity Castle)

Now back there.

"Revived! Muzan has revived! The Hashira and otherworldly heroes must gather at once!" Another kasugai crow informed.

"What?! Muzan revived while we were dawdling around?!" Mitsuri stammered as she leapt to a protruding tatami floor area to avoid being crushed by colliding sections of the Infinity Fortress.

Apparently Nakime was decided to kill everyone who weren't killed by the previous Upper Moons and Dark Clone demons.

Now with the main group, they continued faster until Virgo felt something.

"He is coming...!" She said.

Just as she said, Muzan appeared and landed in front of them, in his combat form.

Tanjiro's heart skipped a beat as Virgo Estrella sensed Muzan's approach. The atmosphere around them grew tense, the air thick with danger and anticipation.

*Tension (Super Mario Galaxy)*

As Muzan appeared before them, now in a more monstrous and fearsome form, Tanjiro's eyes widened in surprise and fear. The sight of the demon king, with his dark-red scales and multiple mouths, was both horrifying and intimidating. Tanjiro clenched his fists, steeling himself for the battle that lay ahead.

"Let's kill him properly but we better be careful..." Caleb said as they surrounded Muzan.

"You could not live with your own failure. Where did that bring you? Back to me. I thought by eliminating your families, the survivors would thrive. But you've shown me... that's impossible." Muzan told us, referring to the part that the families that he or his demons killed, and knowing Keith's power to revive those human lives along with the magic revival rituals from the Zodiac Warriors and Elemental 10 alike too plus the memories from the ones who survived knowing that for every survivor who is alike one of them could request to revive families, Tanjiro being a sample. "As long as there are those that remember what was, there will always be those that are unable to accept what can be... they will resist."

Tanjiro listened to Muzan's words, the demon king's arrogance and contempt evident in every syllable. The reminder of the countless families he had destroyed, the lives destroyed by the demons, filled Tanjiro with a burning anger. He clenched his fists tighter, his resolve strengthening with every word. The mention of survivors who remembered what was, and the ones who resisted, only served to fuel Tanjiro's determination to end Muzan's reign of terror once and for all.

The word 'failure' doesn't sit with us very well." Terran said with a glare, knowing that he and the rest of the Elemental children along with teens blessed by the Zodiac Constellations have the ability to revive deceased people and fix deep or so-called permanent scars.

"It would seem so." Muzan said.

"And how stupid are you?" Gemini said with a glare towards Muzan. "You brought yourself to us, you psycho."

Tanjiro glanced at Terran and the rest of the Elemental children, his gaze shifting to Gemini. The Zodiac Warriors and the Elemental teens stood steadfast and defiant in the face of Muzan's arrogance. Muzan's comment about the word "failure" only served to incense Tanjiro further, and Gemini's words mirrored his own thoughts. The fact that the Demon King had come straight to them, into their trap, was both surprising and infuriating.

"Let's say, we're all kinds of stubborn." Luke commented sassily, knowing that they'll do anything to prevent Muzan killing more people and even the Zodiacs and Elementals who have the ability to revive the killed people.

"No one's gonna buy what a b st rd like you says about your so-called 'thrive' or 'moving forwards' despite the innocent lives who are taken by you!" Caleb snapped at Muzan.

Tanjiro couldn't help but smile at Luke's sass, his spirit lifted by the unwavering determination of the Zodiac Warriors and Elemental children. Caleb's words echoed his own sentiments. The sheer audacity of Muzan, to spout off about thriving and moving forward despite the countless innocent lives he had extinguished, was infuriating.

"As long as there are survivors, any of them will come to us, because they have the memories of their deceased relatives, all of them will be revived and it will fix that kind of damage that you caused for years!" Leo declared while glaring towards Muzan.

Tanjiro's gaze shifted to Leo, a sense of hope surging through him at the young Zodiac warrior's words. The idea that any of the survivors would come to them, to seek the revival of their lost family members, filled Tanjiro with a fierce determination to protect them. The mention of fixing the damage Muzan had done and bringing back the dead served as a stark reminder of the Demon King's cruelty.

"Persistent. You're all seriously persistent. And it bores me. It sickens me from the bottom of my heart. Whenever you open your mouth, you only remember that one dumb notion about avenging your parents, kids, or siblings. You've all survived. That should be enough for you. So your family got slaughtered. What's the problem here? Think of yourself as lucky, and go back to the way you lived life before. And what if they were revived by a group of Zodiac Teens along with Elemental Brats whose magic rituals to revive people is a crime against the nature of my world. Look at it this way. Being killed by me is the same as encountering a great calamity, every human revived must be dead again and that's how it must be in the nature of this world. You don't need to think so hard about it. Rains, winds, volcano eruptions, earthquakes. Nobody tries to swear revenge on a natural disaster, no matter how many lives it takes. You can't bring dead humans back to life, those ones who revived them are against the laws of nature. Why not just stop fussing over the issue all the time, and live quietly to earn your daily wages? Most humans live that life. Why can't you all do that? There's only one reason. The Demon Slayers are an assembly of deviants while the Zodiac Warriors and Elemental 10 are a group of stupid and naive meddlers, lastly the boy who wields the Keyblade of Destiny and his legacy along with the only swordsman who can use the Sun Breathing are a plague in this world. And I'm tired of dealing with deviants, meddlers and plagues. I'm the one who really wants to put an end to all this, only I'm the one who can bring perfection to this world, a race of demons who is always above the human race." Muzan explained. "And after seeing everything, I'm thankful, because now I know what I must do. I will kill every human in this world until there is no one left to remember those who died. And then, after devouring Nezuko and gaining immunity to the sun, I'll create a new world, here in Japan, beyond this land and later the whole multiverse, teeming with life, that knows not what it has lost, but only what it has been given... and I will give perfect multiverse where only the strongest ones will live."

When Muzan explained that, knowing that the Zodiac Warriors and Elemental 10 come from different universes, plus the heroes from other worlds, he plans to kill the families of the Zodiacs and Elementals so that none of them remember those who died. Tanjiro's anger and disgust grew exponentially as Muzan spoke. The Demon King's arrogance and disregard for the lives he had taken were nothing short of monstrous. But when Muzan made clear his intention to kill every human in the multiverse, and then create a so-called perfect universe where only the strongest would live, Tanjiro's resolve hardened even further. Not only to save his own family, but to prevent Muzan from wiping out humanity and creating a multiverse ruled by demons.

"You will pay... everything for what you've done. We'll make sure you suffer a slow and painful death." Aidan said angrily as he had fire surrounding him.

"No one will ever lose you again! Ever!" Sagittarius added.

"You and your demons are opportunists of the darkness to kill and hurt innocent people, and therefore I won't forgive you!" Blake Pierce darkly said.

"Just as we told you before, you are beyond redemption, reason and humanity!" Aaron firmly said.

"You created your own name to be feared when you are a coward who cheats death!" Pisces said.

"I have fear, but I'm not afraid of you!" Luke said.

"We shall see." Muzan said with a smirk.

"Call yourself a savior." Libra sternly said.

"You're nothing more than a disgrace to all life who has no respect for life and death!" Keith firmly added.

"Also you're a big coward who wants to avoid death whatever it takes, which means to kill families to prevent someone talented like Yoriichi from appearing!" Capricorn dryly said.

"Your days of spreading fear and death will be over!" Aria said.

"This is for all your families you destroyed!" Seth said, being not afraid to turn himself against Muzan since he is a double agent.

"You fake to be the King of the Demons when you're really the King of the Cowards!" Alban coldly told Muzan.

"You claim that you want to bring perfection to the universe when your plot is anything but perfection." Gemini scowled.

"Only I see a heart of pure hatred towards humanity!" Cancer angrily said to Muzan.

"You inflict fear to humans and your own demons alike!" Assana angrily said.

"All those humans turned into demons received a fate worse than death!" Skye angrily added.

"Definitely you don't deserve to live anymore!" Terran firmly said.

"And that's because you don't know crap about life, ya." Scorpio said.

"Your search for immortality caused enough damage to this universe." Jupiter growled.

"Your better universe will only lead to chaos!" Leo said.

"Chaos that cannot be overcome, no matter how much you say it is possible!" Virgo added.

"And yet, you're too blind to see it like the idiot and senile you are." Aquarius snarled.

"We will make sure there is no future for you, Muzan Kibutsuji, King of the Cowards!" Aries said.

"This is why we're gonna stop you from creating this pathetic excuse of a new universe." Caleb snarled.

"One born out of blood." Tetsu added, growling.

"And one where everyone forgets existence itself!" Taurus added.

"They'll never know it. Because you won't be alive to tell them." Muzan said with an evil smirk, that no one will remember how will be created his "new" but excuse of perfect universe.

As the Zodiac Warriors and Elemental 10 stood defiant, each of them speaking their own words of defiance against Muzan's evil plan, Tanjiro's heart swelled with pride. The sheer determination and courage of his allies filled him with a renewed sense of hope. Muzan's smirk in response only fueled Tanjiro's anger. The Demon King's arrogance and belief that he would succeed in creating his so-called perfect universe was infuriating.

"No matter what you do, we'll never let you take our families away, not even mine twice! We'll defeat you and put an end to your reign of terror once and for all!" Tanjiro spoke with determination.

"Lady Tamayo...!" Caleb said in realization before demanding. "Where is she!?"

"The traitorous Tamayo? The one who injected me with the medicine which was supposed to turn me into a human? She is dead, but I ended her suffering, all to avenge a pathetic family of humans." Muzan coldly answered us for Tamayo's fate and not caring to insult her late human family.

Tanjiro's eyes widened in shock and sadness as he heard Muzan's answer. The loss of Lady Tamayo, a skilled demon doctor who had hoped to help turn Muzan into a human, was a painful blow. He clenched his fists tighter, his anger and determination only growing stronger with each passing moment. The way Muzan dismissed Tamayo's family as pathetic only served to fuel Tanjiro's hatred even more.

"Why are you so mad? I ended her suffering, I could do the same with you if I killed you in Asakusa, killing you early to reunite you with your family." Muzan told Tanjiro, referring to their first encounter before Tanjiro's family was revived.

Tanjiro's expression hardened at Muzan's words. He remembered their encounter in Asakusa all too well. The demon king's offer to kill him and reunite him with his family angered Tanjiro even further.

"You think that's what I want? To be reunited with my family like that? To die and leave my friends and allies to fight alone?" Tanjiro spat out his words, his voice tight with suppressed anger.

"If anyone has a pathetic existence, it is you, Muzan Kibutsuji, King of Cowards and Crappy Scum!" Caleb sassily told him, seemingly to have a mental breakdown. "If you have hatred against Tanjiro's family or my bloodline, unleash that hatred against us, but leave Tanjiro's revived family out of this!"

Cross vein marks appeared on Muzan's forehead and his eyes were pupiless showing his fury.

"Very well, but you will regret provoking my wrath like this, because no one is a nuisance for the King of the Demons and gets away with it! So, congratulations, Caleb Lhantis! I'll make sure you and Tanjiro suffer a slow and painful death!" Muzan angrily said.

The 12 Zodiac Warriors and 10 Elemental children and otherworldly heroes were taken aback by Caleb's sass and apparent mental breakdown, but none of them were willing to back down. Tanjiro, too, kept his guard up, his own anger and determination bubbling just below the surface. He was ready to take on Muzan, whatever it took.

"We'll see about that!" He replied, his voice steady and resolute.

"We will finish you like the monster that you really are!" Ky spoke firmly.

"You're confusing me, I'm not the monster, Yoriichi was the real monster, that was why I had to send every demon to kill every family related to the Sun Breathing, the family of Yoriichi, and even the family who pretends to be coal sellers, to prevent for someone like Yoriichi to appear and finish what I started 1,000 years ago." Muzan replied in retaliation but calmly.

Tanjiro scowls, his anger rising at Muzan's twisted logic.

"Yoriichi wasn't a monster!" He says firmly. "He was a hero, trying to save humanity from people like you! You're the one who's been terrorizing and killing humans for 1,000 years! Don't try to turn it around and act like you're the victim here!"

"Are you telling me that I'm a coward? Only a coward would accept dying." Muzan scowled in disgust. "I accepted my life as a demon to survive, you have no idea what I went through when I was a human, always frail and prone to diseases, accepting the day when someone has to die is pure cowardice!"

Muzan explained that he was a human and had a frail body just like Tanjiro's dad, Tanjuro, but accepted to die despite being a young adult. Tanjiro can't believe what he's hearing. Was Muzan really trying to justify his actions because he was weak as a human?

"That's not an excuse!" He says firmly. "Just because you were frail as a human doesn't give you the right to destroy lives! There are countless people with weak bodies who don't become monsters! And accepting death is not cowardice, it's a necessary part of life!"

"If you hadn't been so selfish, your family's death would still be the same, because every revived human goes against the nature of this world, my world, every revived human must stay dead." Muzan told them, but directly to Tanjiro at the mention of his family.

Tanjiro's expression darkens at the mention of his family.

"You're wrong!" He says firmly. "Bringing back my family was a gift, not a violation of nature! They deserve to live again, just like everyone else who was wronged by demons! As for you, you're the one who goes against nature! You're a parasite, feeding on the lives of others for your own selfish gain!"

"I could have killed you quickly and painlessly before your family was revived, could you be with them together as you so wanted, maybe you didn't want that? Isn't that ending you wanted, moving on when your family was dead?" Muzan asked Tanjiro.

Tanjiro is taken aback by Muzan's words, his eyes widening as he realizes the sick and twisted logic behind them. He knew that he wanted to be with his family again, but at what cost?

"I'm afraid that's not the point!" Aries started to speak. "The point is that they deserve a second chance to leave, therefore reviving people that you killed is not against the nature of your so-called world."

"You have a point, Multiverse Traveler. But I have another point, beyond Japan, across the sea, there are many people just like him, there are many of them dying by natural disasters, diseases, killing each other, even death in old age, and wanting to avoid death, you cannot save everyone at the same, I'm the one who can save them, being a demon will imply to live many years, once I granted sun immunity I can turn a strongest race than the humans even despite the sacrifices but all of them were worthy to get what I really desired for 1,000 years." Muzan said "reasoning" with them.

"You're delusional and mentally insane!" Tanjiro says firmly with a scowl and shakes his head in disgust. "You're not trying to save anyone, you're just trying to feed your own twisted sense of self-importance! And even if you could turn everyone into demons, what kind of life would that be? One of constant pain and suffering, endlessly feeding on innocent people! That's not salvation, that's damned eternal life!"

"So are you disregarding my point about the natural disasters, diseases, old age and even the people who kill each other? Those people in the world cannot be saved." Muzan reminded them, knowing that is true, sadly but true.

"No one's saying those problems don't exist!" Tanjiro says, clenching his fists and his frustration rising. "And yes, maybe we can't save everyone! But that doesn't give you the right to kill innocent people and turn them into monsters! There are other ways to address those issues, ways that don't involve terrorizing and hurting others! You're just using these issues as an excuse to justify your own evil actions!"

"You believe yourself the undead god but only I see an unredeemable monster who did nothing but avoid death while causing suffering directly or indirectly without regrets, even you didn't care in saving every Upper Moon demon before being killed by us." Caleb said, still angry, to Muzan and Tanjiro agreed with him but his expression still hardened.

"You're right." Tanjiro says before looking at Muzan with a mix of anger and disgust. "You're a monster who doesn't deserve redemption! You've caused nothing but suffering and destruction, with no regard for the lives you've destroyed! You claim that you're trying to save the world, but the only thing you're trying to save is yourself! It's time for you to pay for all the pain you've caused!"

"Only Nakime is the only one that I have, she is the one who has the control of the Infinity Castle. Actually I have underestimated you all, Demon Slayers, Zodiac Warriors, Elemental 10 and otherworldly heroes, very clever for the capricorn warrior to nullify Nakime's Blood Demon Art to prevent her to separate everyone from make me easier for my strongest demons to kill you all, and very skilful to kill the Upper Moon demons, despite they are no longer useful for me, I'll finish what they weren't able to finish." Muzan told them.

Tanjiro listens to Muzan's words, his expression hardening. He had expected Muzan to be a formidable foe, but he was surprised by the praise for his allies and their impressive abilities.

"Don't underestimate us!" Aidan says firmly. "We've faced and defeated powerful enemies before, including every Upper Moon and Dark Clone demon you've thrown at us so far! And we'll keep fighting until you're defeated, no matter what! Your reign of terror ends tonight!"

"I was planning you to kill you fast and painless, Tanjiro, but now I'm going to kill you slowly and painfully, I can bet your family will feel your presence even from very, every wound you receive and the agonizing pain they will feel you in peril, surely you will heard them crying as you will be dying slowly and painfully, but eventually they will be with you." Muzan told Tanjiro as the King of the Demons was getting ready to fight.

Tanjiro's eyes narrow, his expression darkening at Muzan's words. So Muzan was threatening to put his family through further suffering.

"You're wrong!" Tanjiro says firmly, his voice steely. "My family is not going to suffer any more because of you! I'll make sure you pay for everything you've done, no matter what it takes!"

Muzan's eyes narrowed as he saw Tanjiro's sword.

"The sword of Yoriichi, it took me many years to erase all his legacy!" Muzan said with bitterness.

Tanjiro grips his sword tight, his eyes burning with defiance.

"You may have thought you erased his legacy!" He says. "But you didn't! This sword is a reminder of his strength and determination! And it will be the weapon that brings your reign to an end!"

"Very well, then so be it, I will finish your existence, and then your Demon Slayer friends, your family, everything you love and everything you protected I will take away from you, and after killing you all, Bowser now will make the leader of the Brotherhood of Evil, and I will turn them all into demons who will obey me, I'll be like a god for them!" Muzan menacingly told us as his eyes turned completely white without pupils again, seeming like a feral and soulless monster.

"I'm afraid that is not gonna happen! Even if you become the leader of the Brotherhood of Evil, they'll be afraid of you!" Leo firmly said.

"Also Bowser is not pure evil as you are, Muzan!" Aries added.

Tanjiro's expression hardens further, his determination and resolve only growing stronger.

"And you won't take anything away from me!" He says, his voice steely. "You're the one who's going to be finished! I will do whatever it takes to protect my friends, my family, and everything I care about! And I will make you pay for all the suffering you've caused!"

"I could have given you the chance to prevent death, just as I accepted it, it was the only way to survive before being 20 years in human life and this is the thanks that I get!" Muzan said menacingly again.

"Let's agree to disagree!" Caleb said while pointing the schiavona sword and Keyblade at Muzan, Tanjiro nods in agreement with Caleb.

"We're not here to negotiate or agree to disagree!" He says firmly. "We're here to defeat you and stop your reign of terror! And we will not back down, no matter what you say!"

*Black Power (Kingdom Hearts: Birth By Sleep)*

Damian Noctis as Rookester used Power Addition twice for the team members with Sam as Silver Claw gives the first blow against Muzan by using Howl of the Moon, then Muzan started to unleash whips with sharpened bone tips at the heroes but they quickly dodged, then WarGreymon used Terra Force but Muzan dodge the attack, then MetalGarurumon used Metal Wolf Claw but Muzan used his whips to break the icy attack, Crescemon used Ice Archery but Muzan blocked the attack by lashing his whips, Flaremon used Crimson Beast-King Wave while Wingdramon used Wind Blast but Muzan lashed his whips to slice the attack but Magnamon Swordighter used Sacred Sword which managed to hit Muzan but it didn't much damage to him.

"It was a direct hit, but Muzan seems unharmed…" Magnamon Swordfighter grunted.

Everyone lunged to attack Muzan, even Tanjiro, Giyu and Kyojuro unleashed their Demon Slayers' marks for extra power-up, Aidan uses his broadsword and dragon gauntlet, Corona attacks with magma-stoned knuckle-thruster, Assana uses her dagger and aqua whip, Skye her fans and winged boots, Terran his axe with chained ball or flail, Aaron and Blake with the twin rings and their staff and scythe respectively, Alban was ice-surfing and using her ice spear, Krisi was kicking snowballs going like bullets, Winter was using a mace made of ice, Keith was using his twin axe, Jupiter his sabergun, Tetsu his double-edged sword and shield, Aries was firing grenades from his gun, normal, flash and fire (like the ones from Resident Evil games), Taurus was using the Blade of Hope, Gemini using her daggers from her hands and shoes, Cancer was using boomerangs and her claws, Leo was using the Sword of Light and his shield, Libra was using her rapier and Scale Scepter, Virgo was using her magic powered-up with her gauntlets and boots, Scorpio with his twin-scythe, Capricorn was using his magic and elemental spells with his tome, Sagittarius was using his broadsword, Aquarius using his armor was using his chain-swords to perform straight and spiral sword slashes and Pisces sculpted two samurai golems to fight Muzan, Caleb was using his Keyblade and schiavona, Seth was using his Keyblade and Twilight Wand, Aria was using her Keyblade and Battle Axe, Matt Sterling was using his lightsaber, Luke was using his Fire Gauntlet and Keyblade, even their Digimon partners plus shiny Mew were fighting too, however despite all the hits receive Muzan his wounds caused in battle are instantly regenerated.

"Your existence along with your family alive are the only thing connected to Yoriichi legacy which is an illness for my world, one where no one cannot die!" Muzan said.

Tanjiro scowled, his frustration growing with every regeneration of Muzan's flesh.

"You keep talking about Yoriichi's legacy!" He says. "But you're the only illness here! You're the one who's spread nothing but suffering and death for a thousand years! Our existence doesn't hurt anyone, but your reign does!"

"Very desperate to kill me, huh? If you do that, many more humans will die due to natural causes, those ones cannot be saved." Muzan told them.

Tanjiro clenches his teeth, his anger rising at Muzan's words.

"We're not trying to kill you because we're desperate!" He says firmly. "We're trying to kill you because it's the right thing to do! Your existence causes more pain and suffering than any natural disaster! And even if we can't save everyone from natural causes, we can at least stop you from hurting more innocent people!"

"Yeah, we won't let you destroy this world for selfish desires!" Ash declared before gaining Sir Aaron's outfit, the Rainbow Hero form. "Now Mega Evolve! And Gigantamax!"

Then Latias, Charizard, Pidgeot, Kangaskhan, Heracross, two Tyranitar, Sceptile, Glalie, Garchomp, Gengar, Lucario, Blastoise, Tyranitar, Hatterene, Scizor, Pinsir, Houndoom and Alakazam Mega Evolved, and surprisingly Charizard has a mix of his two Mega Evolved forms, the underbelly, eyebrows and underwings are orange color, he has a yellow v in the belly and a blue diamond in the v, three spikes in the tail, blue twin spikes in the forearms unleashing flames, pairs of spikes on each shoulder, twin spikes on the wings, flames unleashing from his mouth and three spikes on the head, two tips of the spikes are light blue while the central one is orange, the Mega Charizard Z roared.

Now for Snorlax, Kingler, Butterfree, Lapras, Machamp, shiny Corviknight and Hatterene gained their Gigantamax forms but still in their regular sizes.

"Sonic! Chaos Emeralds! Chaos Emeralds!" Pinkie Pie shouted.

"Okay then!" Sonic nodded before narrowing his eyes towards Muzan while using the Chaos Emeralds around himself, Mario, Luigi, Kirby, Shadow, Silver the Hedgehog and the Mane Six. "Now we'll show you!"

Then they became Super Mario, Super Luigi, Super Sonic, Super Shadow, Super Silver, Super Kirby (equipped with Starlight Armor and Starlight Sword) and Super Mane Six (just like in the battle against Mega Darkness Devimon from Digimon: Worlds in Danger in the chapter 94), all of them lunged to attack Muzan hitting him more but then unleashed a powerful shockwave which hit and pushed everyone back.

"Damn it…! Even if we're in the Super Forms, Muzan is still powerful for us…!" Super Shadow said.

"Everytime we cut him, he quickly regenerates himself…" Matt Sterling said as he watched and remembered closely.

Back in the battle, Gallantmon used Shield of the Just while Aldamon used Atomic Inferno and BeoWolfmon used Frozen Hunter, however Muzan swung his whips to slice away the three attacks, Imperialdramon used Positron Laser, ShineGreymon Burst Mode used Corona Blaze Sword, Shoutmon DX used Electric Buster Cross, Arresterdramon used Spiral Shredder, VictoryGreymon used Trident Gaia, Gaiomon used Rinkageki to fire traces of light, Ourymon used Immortal Dragon King Blade to fire energy beams, Gaiamon used Ultimate Adamas which summoned a giant blue spear of light before throwing it and Siriusmon used Photon Blaster to shoot rays of light with all of them hitting Muzan but he came out unharmed.

"Do you think that those attacks can defeat me?" Muzan asked. "I'm beyond all of you, no one, absolutely no one can surpass me!"

Muzan sent more whips trying to hit everyone as they dodged but one of the whips slashed Tanjiro in the right eyebrow which felt strong and painful, luckily his right eye was still fine, but suddenly he heard some voices.

"Tanjiro...!" He heard Hanako's voice, her younger sister who is younger than Nezuko.

"Look out...!" He heard Takeo's voice, his older brother who is older than his two siblings Hanako and Shigeru.

"Brother, don't die!" He heard Rokuta's voice crying too, his little brother of 3 years old.

Even if his family is alive he could hear their sadness and concern from very far away, Tanjiro's eyes widen in surprise and shock as he hears the voices of his family calling out to him. The pain from the scythe attack is momentarily forgotten as the weight of his family's concern for him hits him hard.

"Hanako… Shigeru… Takeo... Rokuta..." He murmurs, his voice slightly choked. "I…"

He suddenly feels an overwhelming sense of guilt and sadness, knowing that his family is witnessing his current struggle and the danger he's in. He clenches his jaw, feeling the weight of their concern and worry.

"Brother, please don't die!" Tanjiro heard Rokuta's crying voice which caused Tanjiro to stream tears with concern before dodging another scythe of Muzan.

"Looks like someone received motivation." Muzan evilly told Tanjiro.

Tanjiro wipes away the tears from his eyes, his expression hardening with a mixture of determination and anger.

"My family's watching…!" He says, his voice steady and firm. "And I won't let them down! I won't die here!"

The weight of his family's concern and Rokuta's crying voice ignites a fire within him, fueling his determination to overcome Muzan and protect them, then Ky along with Nex, Noel and Pax joined to fight Muzan.

"Most Keyblade Wielders!" Muzan said.

"Yeah, and we won't let you create your crappy world!" Pax said.

"You are without a doubt, a being that should not be allowed to exist at all!" Ky told Muzan as he scowled, like hearing Tanjiro's voice again.

"After everything you've done you must disappear!" Noel added.

"You better must leave all those families alone and never return to this world!" Nex said.

"And let them become Demon Slayers in the future, never!" Muzan said as he unleashed more whips.

"You asked for it!" Ky said.

Muzan started to unleash new abilities like tossing blood energy orbs at Ky who dodges out of the way and aerial slashes at Muzan with his Keyblade followed by casting Thundaga but Muzan summoned an axe made of flesh and bones to deliver a powerful swing and then delivers a slamming attack but Ky dodges and keeps slashing with his followed by an aerial crescent slash but Muzan teleported away and then reappeared behind Ky and delivers a powerful roundhouse kick and sends Ky down but Nex manages to catch Ky with his shadow hand and then unleashes shadow daggers and throws them at Muzan who swings multiple whips to protect himself but Ky gets behind and tries to slash with his Keyblade followed by a somersault slash while Nex sinks into the shadows and then rises and delivers a shadow uppercut but Muzan retaliated by unleashing four red blood orbs at the two who dodge out of the way and Nex delivers three brutal slashes with his Keyblade followed by unleashing shadow drills while Ky vertical slashes with Dawn of Hope followed by unleashing light rays.

"Is that all you got, pretty boy!?" Muzan asked before forming a big whip made of flesh and bones and lashes at the four but they dodged.

Then Noel delivers aerial slash with her Keyblade followed by casting Mega Flare while Pax aerial slashes with his Keyblade followed by casting White Thundaga but Muzan continues to unleash more whips at them but they dodge but Muzan grabs Noel and delivers a powerful kick and sends Noel down but Pax quickly saves her and then transforms his Keyblade into a bow and fires light arrows at Muzan who disappears and reappears and delivers vertical slashes with two blades made of flesh and bones but Noel triple slashes with her Keyblade followed by unleashing light and dark rays and strikes while Pax horizontal slashes with his Keyblade but Muzan unleashes blood waves at the them but dodge and Noel enters her Limit form and uses Pure Dive but Muzan delivers a powerful rapid punch but Pax counters and diagonal slashes with his Keyblade.

"Not bad at all, but I'm more powerful, I'm superior than all of you together!" Muzan said before planting his arms on the ground to summon spikes of flesh and bones trying to impale the four of them but they dodged.

Noel comes and diagonal slashes with her Keyblade followed by a graceful spin slash but Muzan unleashes his whips to strike at Noel but Pax bashes them away and then vertical slashes with his Keyblade followed by Tai Chi fighting style but Muzan strikes back with triple punching and sending a thrusting kick but Noel horizontal slashes with her Keyblade followed by casting Blizzagga while Pax transforms his Keyblade into a katana and delivers many slashes but Muzan unleashes two blood orbs at them who dodge out of the way and Pax casts White Blizzaga while Noel triple slashes with her Keyblade followed by a flip slash but Muzan unleashes blood waves at them but dodge out of the way and Noel horizontal slashes with her Keyblade followed by casting Earthga while Pax delivers aerial slashes with his Keyblade but Muzan disappears and then unleashes more flesh and bones spikes from the ground but they dodged and Noel came back to normal.

"You four will die soon!" Muzan told them.

Muzan unleashed another bigger whip but they dodged then Ky enters his Limit form and uses Sonic Blade while Nex casts Dark Blizzaga followed by casting Dark Thundaga but Muzan forms a scythe made of flesh and bones before swinging it at the two followed by a spinning strike but Ky triple slashes with his Keyblade followed by casting Earthga while Nex delivers a sliding shadow strike and then delivers a brutal shadow kick but Muzan unleashes more blood orbs at them who dodge and Nex unleashes shadow tentacles and lashes at Muzan while Ky diagonal slashes with his Keyblade followed by a sliding kick and a lower slash but Muzan swings more whips trying to trap them but they avoid the whips and Ky horizontal slashes with his Keyblade followed by unleashing light chains and slashes while Nex vertical slashes with his followed by unleashing a shadow fist and delivers a punch striking Muzan.

"Why don't you just disappear!?" Muzan asked as he fired a rain of arrows made of blood-like energy but they managed to dodge the arrows.

They dodge the arrows and Ky aerial slashes at Muzan who unleashes another blood wave to push Ky back but Nex unleashes shadow blades and sends them at Muzan forms a hammer made of flesh and bones before delivering strong swings followed by a slamming attack and then launches explosive blood orbs at them but they dodge and Ky diagonal slashes Muzan with his Keyblade followed by casting Firaga while Nex horizontal slashes with his Keyblade and casting Dark Firaga to strike the King of the Demons allowing Ky to vertical slashes with his Keyblade followed by a roundhouse kick to strike but Muzan grabs Ky and then throws him against the wall before unleashing blood orbs but Ky dodges and aerial slashes with his Keyblade followed by unleashing a powerful light attack while Nex unleashes a shadow hand and grabs Muzan who managed to get up before forming dual swords of flesh and bones in his own both arms and slashed the two slashes at the two but Nex strikes back with his Keyblade followed by unleashing a shadow claw and slashes with it but Muzan delivers a series of punches at Nex followed by a powerful roundhouse kick but Ky horizontal slashes with his Keyblade followed by a blade stand kick but Muzan unleashes blood orbs to strike at the two who dodge and try to attack but Muzan unleashes whips to try slash them but Ky vertical slashes with his Keyblade followed by a crescent slash while Nex casts Dark Thundaga but Muzan disappears and unleashes a big whip but Nex crushes the whip with his shadow hand and brutal slashes Muzan.

"How can you defeat a being of pure perfection?" Muzan asked.

"You're nothing but an abomination!" Caleb growled as he went to fight Muzan.

"You're certainly better than some of the pests I've met after my revival, but you're not really trying to kill me… are you trying to buy time for the sun to rise?" Muzan questioned, seeing right through them and making Tanjiro and Caleb growl. "The light won't reach into this fortress, and can you really manage when more of your allies have already died?"

"What do you mean?" Aria questioned as she leaped up to avoid the man as he tried to pummel her with his fists.

"The Hashira in the striped haori and the false demon with the strange hair already seem to have been killed by my subordinate, you know?" Muzan said.

Tanjiro, Caleb and Aria felt like they had been punched in the gut, while Pinkie Pie, Noel, Cancer, Assana and Scorpio gasped. Obanai and Mitsuri were dead? How? What had happened? Why hadn't they gotten a notification from a Kasugai crow? No one of the Hashiras has died until now. Muzan hoped that revealing what he could see through Nakime's vision, the scene of Obanai bisected by two sections of the Infinity Fortress and Mitsuri completely liquified, would demoralize his foes, but then Aries quickly whispered to Capricorn who then used a telepathy spell to speak through the team members.

"Mitsuri and Obanai are not dead, this is an illusion created by Yushiro." Aries said through telepathy which reassured them.

"So, where is your princess now?" Muzan asked, referring to Kairi.

"He is far away from the battle!" Sora replied.

"And what about the Insect Hashira who was close to dying at the hands of Doma?" Muzan asked, referring to Shinobu.

"I sent her far away from the battle, out from your reach!" Seth replied.

"It doesn't matter because once I kill you all, I'll go to kill her too, because I swore that this is the night where all the Hashiras must die and I will keep my word!" Muzan declared, willing to kill all the Hashiras that he waited for the Upper Moon demons to kill them, even the ones who were revived like Kyojuro and Kanae.

"Not on our guard!" Zodiac Warriors and Elemental 10 shouted as they transformed to their Stellar Forms and Primal Forms respectively.

"Now here's a special gift from my girlfriend!" Seth said as he jumped and tossed smoke grenades which contained a lot of wisteria clouds surrounding Muzan.

Then all the group of heroes engage Muzan once more, however Caleb along with Tanjiro and Aria landed in another part as they dodged the whips of Muzan but then they saw many corpses of Demon Slayers of Lower Rank, mutilated, quartered and disembodied, proof that Muzan killed them all, Tanjiro covered his nose as he caught the fool scent of the blood, Caleb was shocked and terrible because I couldn't save those lives, and Aria was horrified before feeling dizziness, anxiety, almost losing balance, collapsing in her knees, grabbing her head tightly with both hands, hyperventilating and hardly holding back her tears as she saw too much death. Tanjiro clenched his jaw at the gruesome sight before him. The stench of blood and the dead bodies of the Demon Slayers filled the air, a stark reminder of the lives lost in the battle against Muzan. He glanced at Aria, alarmed at her distressed state. He knew that the sight of death could be too much for some, and it appeared that Aria was struggling to hold back her tears. Tanjiro knelt down beside her, trying to offer some comfort.

"Aria, are you okay? Take deep breaths." Tanjiro told her.

"I'm trying..." Aria replied on the verge of mental and emotional breakdown.

"Now you see it, Tanjiro. This is all the proof that all humans are weak and pathetic, only becoming demons would live for more years instead of dying in vain like that, you cannot save everyone at the same time." Muzan told them as Caleb stood in front of Aria to protect her while she was in a distressed state.

Tanjiro scowled at Muzan's words. The Demon King's arrogance and disregard for human life infuriated him. He knew that not all humans were weak and pathetic, and that there were countless others who fought with courage and determination. Seeing Aria in such a distressed state only fueled Tanjiro's anger and determination.

"That's where you're wrong!" Tanjiro firmly said. "There are humans among us who have strength and resilience. Human lives are not weak and pathetic!"

They continued fighting against Muzan.

"From aboooove!" A familiar cheery voice said.

A loud crashing sound like thunder came from above Muzan, where a section of the floor with all the tables and chairs set up suddenly exploded. Mitsuri came flying through with her long, whip-blade already poised to attack and fire in her eyes. Muzan's head whipped around, staring at the woman he thought had certainly perished, or at least been incapacitated for a while, with wide eyes.

"Love Breathing Sixth Form: Cat-Legged Winds of Love!" Mitsuri bellowed as she twirled herself around and around, creating multiple wide, sweeping attacks that struck Muzan multiple times on the chest and forced him back.

Mitsuri landed on both feet in front of Tanjiro and the others, grinning a tiny bit at her attack's success, but soon pouted when Muzan showed practically no damage whatsoever. Rather than press another attack though, she stood by her friends, with Obani soon appearing from the hole created by her and acting as a shield for Caleb and Aria. Once Muzan saw him too, he became confused. Through his shared eyesight with Nakime, he had seen for himself their deaths occur in real time. Obanai's bisection and Mitsuri's liquefaction, it was impossible for it to have been faked. He knew the Demon Slayer Corps could be crafty in certain situations but faking the deaths of two of their most high-profile members couldn't have been planned from the start.

"Impossible! They were supposed to be dead! All you Hashiras must be dead!" Muzan growled with rage as he turned to Nakime but at the same time her eyes was covered by a talisma and Yushiro was above her. "Nakime!? What's going on!?"

"What am I doing? I'm manipulating this woman's vision, you dumba$$!" Yushiro snarled seemingly from the very walls around them.

What Muzan didn't realize had happened was Yushiro, using his talismans as a way to hide his presence, succeeded where Mitsuri and Obanai could not. He managed to finally get behind the Biwa demon and used another one of his talisman's to make it seem as though the two Hashira had been crushed by one of her attacks. Then he had plunged his fingers deep into the sides of her cranium in order to directly link up with her, granting him total control over the entirety of Muzan's hidden fortress. That allowed him to open up a direct shortcut to where Muzan was for not only Obanai and Mitsuri, but for a few others who were nearby.

"Muzan, you have committed the heaviest sin in this world… you took Lady Tamayo from me. I'll make you kneel in regret!" Yushiro said.

The whole chamber quaked once again, before a loud rumbling was heard getting closer and closer to them. All of a sudden the far wall was torn apart by the forced entry of two different sections of the Infinity Castle, where the doors then opened up and spilled out more reinforcements, the remaining Hashiras and the other heroes who arrived at the fortress.

"Everyone! They're all here now!" Caleb thought as Aria couldn't help but smirk slightly in relief as she made eye contact with the other Hashiras with the heroes and nodded her head.

"Seems like you ran into some trouble yourself there, Aria. But I can see you're doing just fine, right?" Kanae asked with a smile to Aria

"Yeah. I don't think I have to tell you who made it possible, either." Aria replied, Sanemi grumbling a tiny bit before he fixed his gaze back on Muzan.

"It's time to finish off that ba$tard…" Sanemi said.

"I couldn't agree more." Gyomei agreed while twirling his flail with such force that it was making the ceiling beneath him creak and bend.

The Infinity Castle rumbled and groaned again, before it started to feel like every single part and section of the near-endless labyrinth began to move upwards. Muzan had to catch his balance a little, as did the heroes. That could only mean one thing. Yushiro was using his control over Nakime and, by extension the Infinity Castle, to drive them upwards towards the surface where Muzan could be exposed to the only weakness that was sure to kill him, the light of the morning sun.

"C'mon, just a bit closer…!" Caleb whispered.

The assembled heroes were engaged with Muzan in a bitter fight that was rapidly destroying the room they were in every passing second. Yushiro from his position with Nakime could see everything that was happening and was trying to assist his allies any way he could, with a rumble he changed their position to an entirely new area, forcing Muzan to direct his attention to both him and the enemies before him. Yushiro could feel Muzan's influence start to seep into his mind, starting by a discoloration and corruption beginning to spread through his fingers up and up his arms. The younger demon fought back against the King of the Demons, and with Tanjiro and the others heroes assisting by attacking the master monster directly, he could keep himself sane so that he could continue utilizing Nakime to bring the fortress closer and closer to the surface.

"Stop interfering and die!" Muzan roared as he kicked Luke away, his cry directed towards Yushiro.

"Water Breathing Fourth Form: Striking Tide!" Giyu performed his attack

"Serpent Breathing First Form: Winding Serpent Slash!" Obanai performed his attack.

A two-pronged assault by Obanai and Giyu forced Muzan again to focus on his enemies, his back growing several large bone spikes as he used his hands and forearms to block and deflect their blades while lunging at them at the same time. Cuts were made on his body but they instantly healed, before the floor suddenly turned into two massive sliding doors that opened up, revealing a chasm that sent him falling into it along with the two Hashira. Tanjiro and the others were quick to follow, bouncing back and forth from wall to wall of the chasm to trade blows with the King of the Demons and continue to press the attack. Kanae and Kyōjuro with their blinding speed blindsided Muzan left and right, their Flower Breathing and Flame Breathing techniques frustrating him to no end until he finally decided enough was enough. Firstly, to handle the situation with Yushiro, he clenched his hand tightly and instantly crushed Nakime's head with his own cells in her body.

*Ends*

"Finally…" Aries said, knowing what is gonna happen.

However, Yushiro gasped as Nakime's blood splattered over his hands and clothes, but he managed to direct her to raise the Infinity Fortress to the surface.

'Dammit, he killed her! If she dies, the whole fortress will come apart and crush everyone except for Muzan!' Yushirō thought.

Just then the structures started to collapse completely as the team members were dodging the falling structures.

'The fortress is coming apart around us! If we don't get outside, we're all going to be squished flat!' Obanai thought as a sense of urgency overtook him, spurring his body on to fight harder.

(Academy of the Omniverse)

Now there, the structures around the academy started to collapse and fall down but luckily the barrier around the academy protected everyone.

"What is happening?" Kairi asked.

"The fortress is falling down." Green Yoshi said as he watched.

"Yes, once Nakime is destroyed, the Infinity Castle will collapse." Ashton said but then he received a message before reading it. "The Infinity Castle is collapsing and falling down, send reinforcements from everywhere, we must make sure Muzan is defeated, we must hold him until dawn, two hours remain."

Ashton nodded in understanding knowing that it is time to put an end to a future multiversal threat.

(Taisho Period: Mount Sagiri)

Shinobu along with the triplet girls couldn't help but gasp as they felt tremors.

"I must go." Shinobu said and they nodded before going outside.

As she advanced she saw many structures from the Infinity Castle but also the corpses of the Demon Slayers of Lower Rank, she gasped with concern before running to help Seth.

(Town)

Now with the heroes' group, all of them arrived in a town.

"We're outside… but we brought him right into a town!" Sanemi exclaimed, the other heroes quickly coming to for when Muzan would make his own emergence.

"Dammit, there's gotta be loads of people here, and it's not even dawn yet…" Obanai cursed while looking around at all of the buildings and the night sky. "How are we going to evacuate the people and keep Muzan contained at the same time?"

"We're just going to have to figure it out. The master should already know the situation and have dispatched the Kakushi to aid in making the area safe for battle!" Gyomei announced to soothe the worries of his comrades.

"I already called my dad!" Aidan said as he showed his phone.

"Somehow, I feel like I want to take a deep breath…" Caleb said.

*Catastrophe (Super Mario Galaxy)*

Suddenly, Muzan Kibutsuji burst through a pile of rubble as he launched a big shockwave which hit and pushed back everyone.

"Caleb! Look what have you done! You wanted this!? I worked so hard to create my perfect world! I had it all with the Blood Moon Demons and the Infinity Castle! You stuck your goddamn business and ruined everything that I worked for, including the last trace of Yoriichi which was supposed to be gone!" Muzan roared with an incredible fury, in a rage and villainous breakdown, that made Caleb try to crawl away but Muzan stomped his back with his left foot and then grabbed him by the head with his right hand before punching him in the ribs and sending him crashing into a wall. "Now you will suffer like me!"

Muzan grabbed Caleb by the shirt collar before slamming against the floor and launching him through many buildings.

"You're nothing but a stupid, weakling, annoying and pathetic meddlesome brat who messed in my quest for immortality! Come out and die! Or are you too scared!?" Muzan asked Caleb with a menacing tone before asking with a snarling tone. "Did you think you could hold me until dawn? I will destroy everything you love, just like you destroyed everything that I worked for 1,000 years!"

*Ends*

While Caleb was trying to recover himself, Tanjiro managed to recover himself and performed an attack from his Sun Breathing which hit Muzan as he growled like a soulless beast at Tanjiro before shoulder ramming him and sending him to crash against a wall as he felt blood escaping from his mouth however Tanjiro managed to get up before confronting Muzan.

*A Great Evil (Hyrule Warriors)*

Tanjiro stumbled back, his body jarring from the impact of Muzan's attack. He spat out a mouthful of blood, his eyes narrowing in determination as he faced down the King of the Demons. He knew that Muzan was at his most dangerous when he was enraged like this. His powers seemed almost limitless, and he was driven by a single-minded focus on creating his own perfect world. Tanjiro knew that he had to fight with everything he had if he hoped to stand a chance against Muzan. Tanjiro clenched his fists after listening to Muzan's outburst, said furious words and accusations towards Caleb filled Tanjiro with a fierce determination.

"Don't you dare take your anger out on him!" Tanjiro snapped, his voice filled with righteous fury. "Caleb is a brave and loyal friend who has fought alongside us every step of the way! He may be young, but he has more courage and tenacity than you could ever hope to possess!"

"HIM!?" Muzan roared intensely before ranting. "He took everything away from me! Now I will do the same to him! He has the fault to exist, as his bloodline did not deserve to exist! Just look around you, the Infinity Castle is destroyed and Caleb has the fault for interfering with my goals, just like you!"

Tanjiro clenched his jaw, his anger only growing hotter at Muzan's accusations towards Caleb and his bloodline.

"You're deadly wrong!" He snapped back. "Caleb is not responsible for your failures or your twisted desires! It is you who has brought suffering and tragedy upon countless lives, all in pursuit of your own selfish goals!"

Tanjiro stepped forward, his voice steady and determined despite the fear and uncertainty that coiled in his gut.

"If anyone is to blame for the destruction of the Infinity Castle and the deaths of countless Slayers, it is you, Muzan Kibutsuji!" He told the villain.

"My Blood Moon Demons, Upper and Lower ones did the job, destroying everyone who is related with the Demon Slayers from the past, I started this 1,000 years ago, I will finish it, and no matter how cruel or ruthless my actions are, I'll do everything to fulfill my words, I'm the future of this world, I'm their only salvation!" Muzan expressed his fury.

Tanjiro narrowed his eyes, his anger mixing with a deep sense of incredulity at Muzan's words.

"You call yourself their salvation? You're nothing but a monster who has brought nothing but misery and death wherever you go!" Tanjiro shouted as he clenched his fists, his heart pounding with a mixture of anger and determination. "We won't let you finish anything! We'll stop you and end your rule of terror, no matter what it takes!"

Muzan growled as he disappeared in seconds before punching Tanjiro again sending him to crash against many buildings, the other Hashiras along with Zodiac Warriors, Elemental 10, even Caleb's close friends went to interfere but Muzan sent another huge shockwave which hit and pushed back everyone before unleashing his whips but then many Demon Slayers of Lower Rank interfered by using their own bodies to sacrifice themselves for the Hashiras, Zodiacs, Elementals, otherworldly heroes and Tanjiro alike.

"Charge!" A random Demon Slayer shouted. "Get in front of them!"

"Use your bodies as a wall to protect the pillars and the other heroes!" A random Demon Slayer instructed as they were protecting the Hashiras and otherworldly heroes.

"Don't let Muzan kill them!" A random Demon Slayer said.

"At the very least, we'll protect the swordsmen who can stand against Muzan!" Another Demon Slayer explained.

"The Hashiras protected us for years!" Another random Demon Slayer said.

"We were saved by the pillars so many times up to now!"

"If it wasn't for them, we would've died a long time ago!"

"Don't lose courage! Fight!"

"Now we will return the favor to them!" The Demon Slayers of Lower Rank kept fighting against Muzan's assault.

"Stop it! Stop it! Everyone!" Mitsuri and Super Pinkie shouted in despair.

Tanjiro tried to move but he was too tired as he watched how more Demon Slayers were being injured and killed mercilessly by Muzan. Tanjiro again struggled to get up, the pain racking his body as he watched the Demon Slayers sacrifice themselves to protect the Hashiras and the others.

"No...!" He cried out, his voice hoarse and ragged. "Don't throw your lives away like this!"

He could only watch in horror as more and more Slayers were injured and killed, their bodies falling one by one as Muzan's whips cut them down mercilessly.

"C'mon, didn't you say that you're going to defeat me, no matter what it takes!" Muzan said as he continued killing other Demon Slayers of Lower Rank, Tanjiro tried to get up but the pain was intense and was mixed with exhaustion for being awake most of the time awoke during the night.

Tanjiro gritted his teeth, his body screaming in protest with every movement he made as he struggled to get back on his feet. The pain was intense, and he could feel the exhaustion weighing heavily on him. He knew that he had to push himself to the limit if they were going to stand a chance against Muzan and stop him from taking any more lives.

"I won't let you win…!" He said through gritted teeth, his determination burning hotter than ever before. "I'll find a way to defeat you, even if it kills me."

"Tanjiro..." Caleb said weakly, calling him, struggling to get up.

Tanjiro's eyes widened as he heard Caleb call his name. He looked in Caleb's direction, his heart clenching at the sight of his friend struggling to get up.

"Caleb…!" He said, his voice filled with concern and determination. "Hold on, I'm coming to help you…!"
Tanjiro hears more screams, not wanting any more Demon Slayers to die, stands up and tries to run back into the fight against Muzan, but stumbles and falls, coughing out large amounts of blood.

"Tanjiro...!" Caleb shouted.

"Oh yes, those who die right away are quite lucky. But even if they don't, getting wounded by me will spell their end, just look over there." Muzan explained as the heroes turned to see that Tanjiro was slowly agonizing with the wound in his right eyebrow turning into a large clump of flesh difficulting him to see, being injured previously by Muzan in the former and destroyed fortress. "My blood is infused into my attacks, but he won't become a demon, it's just too much blood, it'll work like a poison instead, it will destroy cells, leading to his death."

Just as Muzan said, Tanjiro's pain was increasing, and also the Demon Slayers of Lower Rank were having the same effect, those ones who sacrificed themselves for us, however, Muzan's blood wasn't affecting me as I managed to get up. Tanjiro let out a strangled gasp as the pain in his body grew more intense, his vision blurry and his mind clouded by the agony of poison-like Muzan's cells. He could hear Caleb's voice, but it seemed distant and faint, drowning out under the roar of his own heartbeat in his ears. The Demon Slayers around them were also beginning to feel the effects of Muzan's blood, their bodies wracked with pain and decay.

"Tanjiro... Tanjiro!" Tanjiro heard the voice of his mother, Kie, her voice was heard tearfully.

"Brother, get up...!" Takeo shouted tearfully.

"Tanjiro, wake up!" Shigeru shouted tearfully.

"You promised us that you will return!" Hanako said tearfully.

"Brother, please don't die, don't leave us!" Rokuta's voice shouted in tears.

Tanjiro despite his agonizing status, he was able to hear the voices of his family from very afar, the voice of Rokuta being the youngest sibling of the family, his voice produced a tearjerker effect on Tanjiro, his heart clenched painfully at the sound of his family's voices, so faint and distant yet filled with so much love and worry. He wanted nothing more than to reassure them, to tell them that he was alright, that he was coming back to them. But the words wouldn't come. The pain and the poison-like Muzan's cell were too strong, making his body feel heavy and unresponsive.

"Tanjiro, your sister Nezuko will come here, hold on." He heard Tanjuro's voice, his father telling him.

Tanjiro's heart leapt at the sound of his father's voice. He had not heard that comforting, reassuring tone in so long. It gave him a small spark of hope. He listened closely, clinging desperately to his father's words.

*Ends*

(?)
Now with Tanjiro, he opened up his eyes but he was in a different body and watched the blue sky.

"The blue sky? Did dawn arrive? No, that's not it. That can't be… I can't smell anything at all."
He kept watching until he recognized a familiar house.

"Is this my home? No, it's similar but it's a bit different, this isn't my home. What am I doing? Chopping wood? Am I seeing a flashback?"
Just then tiny hands grabbed the young man who looks like Tanjiro by the pants and he turned to see a small girl wearing a purple kimono, she has black hair tied with a small pink bow and purple eyes.

"Dadaaa…" The girl said.

"D-dad? Is that me? Who is this kid?"

"Uuuu. Nnhh." The girl pointed to the tree as they saw Yoriichi himself.

"The swordsman of the original breathing. Yoriichi, right?"

(Town)
Just then back outside Tanjiro's mind and memory of his ancestor, Caleb was grabbed by Muzan's Chain Throw which slammed him against shiny Mew and Magnamon Swordfighter who was reverted back into DB Veemon and crashed close to Muzan who then used Demon Laser which hit Seth, Darkrai and Flaremon who reverted back into Coronamon, and Demon Charge which hit Aria with Alcremie and Crescemon who was reverted into Lunamon, they crashed close to Murata who yelped in fear.

"Seth…!" A female familiar voice called him as the Digidestined of Redemption turned to see Shinobu.

"Shinobu, what are you doing here…!?" Seth asked in shock.

"I heard the tremors and I saw the corpses…!" Shinobu said with concern, seeing their critical conditions.

"Are you crazy? Muzan threatened to kill you too, knowing that Doma wasn't able to do it!" Seth said in shock and panic.

"Don't make her mad!" Murata yelped as warning for Seth.

"No, it's alright." Shinobu told Murata. "After all, Seth is my boyfriend."

"Your boyfriend…!" Murata said in shock.

"Shinobu…" Aria said but started to cough blood.

"Shh, don't speak Aria, you're badly injured." Shinobu told her soothingly

"Heal…" Caleb casted Curaga around him, his two allies and their respective partners, but they are still tired.

"What happened to Tanjiro?" Shinobu asked as he saw Tanjiro's moribund state.

"Muzan's cells affected Tanjiro like a poison… Even my healing spell can't heal him enough…!" Caleb replied.

"And worst of all, he was gifted by Tabuu's power, making him even more powerful than before… He'll do anything to destroy us…!" Seth said.

Just then, Shinobu saw Muzan in his combat, she couldn't help but gasp in the same shock when she saw the huge explosion in Ubuyashiki Mansion, she felt her hands sweating from fear.

(?)
Back inside Tanjiro's mind, in the house with Yoriichi and Tanjiro's ancestor, Sumiyoshi Kamado.

"I wanted someone to listen to me." Yoriichi said. "After thinking for a while what came to mind were your and Sukayo's faces, maybe I can hear about the thirteenth form…"

"It's been two years, I'm glad you're doing okay." Sumiyoshi said. "Hm? What? Eh?"

The baby tried to walk away but Sumiyoshi grabbed her.

"Back then, Sumire was just a baby, now she's a lot bigger." He said.

"I can't say what I'm thinking about at all… Ugh, my body's moving on it's. I see, of course, these are inherited memories from my ancestor, I can't interact with them, last time it was a dream." Tanjiro said in realization as his voice cannot reach the place.

"I'm happy to see you all happy, when I see humans, I feel happy as well." Yoriichi said before explaining. "This world is beautiful in every single way, I believe being born into this world is a blessing in itself. My mother was a very religious woman, she prayed for strife to disappear from this world every single day, she also prayed for the sun god, to shine warmly on my seemingly deaf ears, she even made me earrings as charms. I couldn't really speak at the time, so I caused her great worry, and I felt very bad about that. My brother was a nice boy, he was always worried about me, even the day after my father hit him and told him to forget about me, he made me a flute and gave it to me, then he smiled with his bruised face and said: that's why don't need to worry about anything. I was an unwanted child, so after my mother died from illness, I immediately left the house, they told me to enter the priesthood, but in the end, I never went to the temple. I wanted to run as much as I could and see how far the beautiful sky reached. But even though I ran for an entire day and night, my feet never felt so tired or wanted to stop. By the time I realized it, I had arrived at a place full of compact fields and paddies in the mountains and someone was standing there all alone, it was a girl around my age, the girl was holding a bucket and didn't move for a long time, eventually I asked her what she was doing."

During the explanation Yoriichi remembered his whole childhood as the younger Yoriichi was speaking with the solitary girl.

"My entire family died from a widespread disease, I'm lonely since I lost everyone, so I wanted to bring some tadpoles from the paddies back home." The girl replied.

"After saying that, the girl didn't move, but as the sun began to set, the girl released all the tadpoles in her bucket back into the paddy." Yoriichi explained.

"You're not going to bring them home?" The younger Yoriichi asked.

"I'm not…" The girl replied. "I feel bad about separating these kids from their parents and siblings."

"Then how about I go home with you?" The younger Yoriichi asked her, causing the girl to gasp with tears in her eyes as she turned to see him.

"Eh?" The girl wondered.

"Her eyes were like obsidian, the girl's name was Uta. And that's how Uta and I started living together. Uta was a girl who talked from day to night. But thanks to Uta, I learned that people saw things differently from me, she said she had never heard of anyone who could see through a living creature's body. That moment was the first time I learned about the vague reason behind my feeling of alienation. Uta held my hands as if it was a kite whose string got cut loose, she always made sure to grab it tightly. Ten years later, we became husband and wife, when Uta was in her last month of pregnancy, I went to fetch a midwife so we could prepare for the birth, I was planning to return before the sun set, but along the way I ran into an old man trying to travel over three mountains, his heart wasn't doing well, but he was rushing because his son was on the verge of death after being wounded in battle. So, I accompanied the old man to his son's place, then I decided to wait until tomorrow to get the midwife. I got home as fast as I could, but the sun had set." Yoriichi explained as he was remembering the events.

And in one of them, his wife Uta was clawed by a demon, lying on the floor dead along with the unborn child.

"And Uta had been killed along with the child in her belly. Even if something is more precious than your life, others can easily trample over it. I spent ten days absentmindedly embracing the corpses of my wife and child until a swordsman who had been chasing the demon told me that they should receive a proper burial to respect their souls. My dream was to live a quiet life with my family, a small home was fine, I wanted to sleep with our futons side by side, a distance where I could see the faces of my loved ones, a distance close enough to immediately grab their hands, if I reached out. That would've been enough for me, but even would never come true, because demons existed in this beautiful world, I became a Demon Slayer. Apparently, these people had been chasing demons since antiquity, nobody could use breaths, so I taught the others how they worked. The swordsmen called pillars were already excellent and once they used breaths on top of their sword forms of flame, wind, water, thunder and rock, their power rapidly increased. The Demon Slayers began defeating demons with amazing force, even my own brother joined the Demon Slayers and helped us after his subordinates were killed. Also I met a boy who could wield a golden key-shaped blade-like weapon in company of an archer who could use wisteria arrows. Then soon after, I came across the progenitor of demons, and the moment I met him, I understood that I was born into this world to defeat this man, I was accompanied." Yoriichi explained.

The moment where Yoriichi's happiness was taken away, later met others swordsmen including one who seemed like Rengoku, and managed to find Muzan has the whole fault of everything, meaning that Tanjiro went through the same like Yoriichi, Gyomei, Kocho sisters, Shinazugawa brothers and Muichiro. The scene showed how Yoriichi, Caleb and Ki (Keith Miller's ancestor) fought against Muzan.

"That man was overflowing with violent vitality, he closely resembled the magma blowing out of a volcano, he was bubbling and boiling, trying to swallow everything up. I am no longer interested in warriors who can use breaths, right after he said that, the man brandished his arms. They were frighteningly fast and his rage was huge, when we dodged his attacks, we could clearly hear the bamboo being cut behind us, I felt like I would be close to dying if I got the slightest scrape, for the first time in my life, chills ran my spine, the man had seven hearts and five brains, this was the moment I perfected my sword technique form for the ending blow." Yoriichi explained as he used the thirteenth form to defeat Muzan.

"The perfected form…! The thirteenth one…? I want to know! I want him to tell me!" Sumiyoshi said as Yoriichi continued.

"The man seemed confused over the fact that he wasn't regenerating, he was holding his severed head so it wouldn't fall off, but it wasn't connecting. I knew that my red blade would work instantly on the progenitor of the demons, but I really wanted to ask him something. What do you think lives are? The man didn't respond, he just looked at me, his face swelled dark red, perhaps out of anger, so I figured that my words did not reach his heart, then I glanced at the demon girl he brought, the girl didn't even try to save him, her eyes were wide open and eager, she was staring at the man whose head got cut off, strangely enough, I saw the light of hope glimmering in those eyes, but when I took that step forward towards him, I decided to finish the man off before the woman, I heard the sound of clenched molars breaking. The next moment, the man's flesh exploded with great force, out of the 1,800 pieces of flesh that were scattered, we managed to destroy 1,700 on the spot, but the remaining flesh bits were too small, if put together, I had probably allowed a chunk of flesh the size of a human head escape, and as I stood still." He explained how he and the other two were able to defeat Muzan for the first time but was able to escape and as for the woman, it is Tamayo in the past. "We heard the sound of the girl wailing as if she was screeching, and the sound of her falling to the ground."

"You were so close, you were so close… He actually conquered the weakness of his head…" Tamayo tearfully said, meaning that 1,000 years ago Muzan was immune to being killed by being beheaded, while she kept squeezing her own head. "You should've just died! You filthy man! Muzan Kibutsuji! I'm not dying… Why am I not dying?"

"When I calmed down the panicking and confused girl, she told me everything about that man, as if a dam had burst, then she also said the progenitor of the demons, Muzan Kibutsuji would probably never appear again until I died. I had temporarily freed the woman from Muzan's control because he had weakened, so asked her to help me to defeat him. She was confused at first but she agreed, she said her name is Tamayo and her eyes looked very sad."

"Tamayo!" Tanjiro's voice said in realization.

"After that, my allies rushed to me and told me that my brother became a demon, then I took responsibility for not defeating Kibutsuji, for letting Tamayo escape and my brother becoming a demon and I was exiled from the Demon Slayers. Several people shouted about putting a blade through my chest, the master who had just become the head at the age of six, stopped them. For a child who lost his father and had a weak heart, it must have been extremely stressful, and I felt very bad." Yoriichi explained the events and then went back to the house.

"It's not your fault, Yoriichi…" Sumiyoshi said.

"I believe that I was born into this world with a special strength to defeat Muzan Kibutsuji, but I failed, I failed in the end and because I failed a lot more people will lose their lives, it pains me." Yoriichi explained.

'The words aren't coming out… Too many things happened to Yoriichi, and I couldn't find any words to say to him… It may have been possible… That my ancestor Sumiyoshi might've said something here, but we continued to sit in silence for a long time.' Sumiyoshi said in his thoughts feeling so bad for Yoriichi, now knowing that he passed through a lot of pain and also his chance to find new happiness was taken away all by Muzan's fault. 'I want to do something for him, this man was deeply hurt when he came here. Something…'

Just then, Sumire grabbed Yoriichi's haori.

"Cawwyy…" Sumire said.

"Ah, please carry her, she gets really happy when you raise her to the sky, and you're taller than me, so…" Sumiyoshi requested Yoriichi.
Then just as he said, Yoriichi lifted up Sumire as she was giggling in delight, then Yoriichi started to stream tears finally finding happiness again.

"Sumiyoshi, I'm back! Look! The chestnuts are really big this year!" Suyako said as she was carrying a basket of chestnuts, also was carrying a baby boy on her back and then she saw the heartwarming scene of a tearful Yoriichi hugging Sumire. "What's wrong? Huh? Oh! It's Yoriichi!"

Then she approached Yoriichi.

"Why're you crying so much! It'll all be okay for sure, I'll let you eat all you want until your tummy gets full, okay? Hey, cheer up." Suyako told him.

"I know we're in the middle of a battle, and even Yoriichi's heart stopped a hundred of years ago, I can't help but hope that this man's heart could be spared for even just a bit…"

(Town)
Back there, in the present, Muzan opens his wings just like the ones like Tabuu and blasts out three red-blood energy rings, the Off Waves attack, sending them towards all the heroes and hitting them all, causing massive damage to them, even Caleb stood in front of Aria with partners included while Seth stood in front of Shinobu, also Muichiro did the same to protect Makomo, the three protectors took most of the damage while Capricorn was able to cast a protective barrier around Tanjiro's unconscious body, every hero was having troubles to get up, each one of the heroes have cuts, bruises, tears and blood covering them, also there are cracked armors and tattered clothes, even few of them have Muzan's cells acting like poison, the attack was very powerful that even reverted the Digimon back to their regular forms, except for WarGreymon, MetalGarurumon, Imperialdramon, Gallantmon, Beelzemon, ShineGreymon, MirageGaogamon, Rosemon, Ravemon, Shoutmon DX, Siriusmon, Gaiamon, Gaiomon, Ourymon, the Mega Evolved Pokémon and Gigantamized also were reversed back to their regular forms with only the Legendaries, Ash's Pikachu and Mega Charizard Z still standing but tiredly, even with the Power Addition, Muzan's level was beyond everyone as Muzan himself smirked as he realized that he was starting to win despite he has no more his Blood Moon Demons or the Infinity Castle while Caleb helped Tanjiro to get up despite their critical states.

*Worth It (2:30 to 4:21 - Avengers: Endgame)*

"In all my years of searching... violence… slaughter... It was never personal." Muzan said as an evil grin crossed his face. "But I'll tell you now… what I'm about to do to your stubborn, annoying little world, I'm gonna enjoy it. Very, very much."

*Mammoths (Ice Age 2: The Meltdown)*

Caleb and Tanjiro slowly turned to see a mystical portal partially lighting up the dark atmosphere. What they saw inside was Wakanda and slowly coming out of it were three figures. It was Okoye and leading her was none other than King T'Challa in his Black Panther suit and his sister Shuri in her gear. T'Challa dismissed his mask to take a good look at Caleb and Tanjiro who were panting heavily, the Digidestined of Destiny was relieved while Tanjiro was a bit surprised at receiving new reinforcements, but then more portals appeared, one revealed to be Tommy Oliver as the green Mighty Morphin Power Ranger, apart from the first generation, also the Mighty Morphin Alien Rangers, Zeo, Turbo, Space, Lost Galaxy, Lightspeed Rescue, Time Force, Jindrax, Toxica, Ninja Storm, Dino Thunder, SPD, Mystic Force, Operation Overdrive, Jungle Fury, RPM, Samurai, but also Gorenger, J.A.K.Q., Battle Fever J, Denziman, Sun Vulcan, Goggle-V, Dynaman, Bioman, Changeman, Flashman, Maskman, Liveman, Turboranger, Fiveman, Jetman, Dairanger, Goseiger, Gokaiger, Go-Busters, Kyoryuger, ToQger, Ninninger, Zyuohger, Kyuranger, Lupiranger, Patranger, Ryusolger, Kiramager, Zenkaiger, Donbrothers, King-Ohger and Kamen Riders.

"Wow…!" Aries said, amazed and excited despite being tired while another portal came revealing the whole Team Fortress 2.

"If fighting is sure to result in victory, then you must fight!" Jane Doe Soldier said.

"We are here to fight by your side." Tommy Oliver said.

Just then from the same portal to which it came to T'Challa, the Falcon appeared flying along with the Millenary Falcon spacecraft.

"Woohoo!" Han Solo said.

Then more portals started to appear, the first ones to appear were more ally spacecrafts and then Flynn Taggart aka Doom Slayer appeared along with Sans, Papyrus, Squid Sisters with a lot of Inklings, Flying Man (from Earthbound), Lip (from Panel Pon), Dilan with his wind spear, Aeleus with his tomahawk, Ienzo with his book, the Iron Giant, the whole Avengers team, Carol Danvers included, Fantastic Four, Spidermen (Maguire, Garfield and Holland versions, also Miles Morales, SpiderGwen and Spiderpig), even Venom (from Sonyverse), X-Men, Deadpool included, Daredevil, Ghost Rider, Loki, Guardians of the Galaxy, Jedi Order, Clone Army (from Star Wars 2; completely loyal to the Academy of the Universe), Justice League, Hal Jordan including with the green lanterns around the galaxies, Suicide Squad (Bloodsport, Deadshot, King Shark, Harley Quinn, Ratcatcher 2, Katana, Killer Croc, El Diablo and even Peacemaker), Captain Marvel with his siblings included, even the Asgardians, Valkyries, Amazoness and Atlanteans.

"Don't make me come down, you punk." Stan Lee appeared briefly in the sky.

Then the Oracle members appeared too along with the other heroes (the ones who were recruited across Digimon Worlds in Danger, MLP: Making a Foal of Me, Big Hero Six, Super Smash Bros: Team Tag Tournament and Academy of the Omniverse, minus the younger members), even the other partners of Matt Sterling, Meramon, Andromon, Monzaemon, Unimon, Leomon, Ogremon, Frigimon, Mojyamon, Centarumon, Elecmon, Swanmon, Otamamon, Gekomon, ShogunGekomon, Azulongmon, Ebonwumon, Baihumon, Zuqhiamon, Spencer Damon with BanchoLeomon, Commander Samson with Kentaurosmon, Homer with JumboGamemon, BishopChessmon with Megumi, RookChessmon with Miki, Seraphimon, Ophanimon and Cherubimon with an army of powerful and goods Digimon which included particular Apollomon (crimson), Neptunemon, Zephagamon, HeavyLeomon, Mitamamon, Darkdramon, BloomLordmon, Hexeblaumon, Jupitermon, Craniamon, AvengeKidmon, GranDracmon, Kuzuhamon, pink Plesiomon, Gankoomon, Minervamon, Venusmon, Proximamon, MedievalGallantmon, Quantumon, GigaSeadramon, MetalPiranimon, Achillesmon, Volcanicdramon, orange Hououmon, PileVolcamon, Boltmon, Regalecusmon, MarineAngemon (a bit bigger than Kenta's one), ZeedGarurumon. Skadimon, a golden Seraphimon, Big-Jagamon (mega level of Jagamon), Dinorexmon, Rafflesimon, Raijinmon, Suijinmon and Fujinmon.

Also it came out Hyrule Warriors (from Age of Calamity in Zodiacs' universe) which included Link, Zelda, Impa, Mipha, Daruk, Revali, Urbosa, Obab, Great Fairies, Monk Maz Koshia, Sidon, Yunobo, Teba, Riju, Master Kohga, Sooga, with the whole Yiga Clan, Terrako, King Rhoam, Battle-Tested Guardian, Purah and Robbie, the Galactic Federation, including Rundas, Ghor and Grandayda (revived thanks to Celica Destiny), Centurion Army from Skyworld along with Magnus, Dark Lord Gaol and Phospora, the Star Allies which all of them are the copy abilities from Kirby like Gaw-Gaw, Spynum, Vividria, Bugzzy, Bubbles, Bloon, Waddle Doo, Beetley, Ringle, Poppy Bros. Jr., Bubble Head, Burning Leo, Galbo Jr., Clown Acrobot, Broom Hatter, Tac, Sir Kibble, Chemitory, Digguh, NESP, Chilly, Bonkers, Starman, Capsule J, Leafan, Boxy, Birdon, Armoroid, Metalun, Minny, Pichikuri, Simirror, Biospark, Parasol Waddle Dee, Plasma Wisp, Venog, Bernard, Sandran, Lanzer, Como, Jammerjab, Rocky, Phan-Phan, Sword Knight, Blade Knight, Caller, UFO, Driblee, Wheelie, Wester, Gim, Kawasaki, also the purple, brown, white, orange and shadow Kirby, even Dyna Blade,the Cornerian Army, the Elite Mobile Task Force, the Gym Leaders, Elite Four and Champions from Pokéarth (like in Pokémon Masters; minus Poppi), even Bede with Galarian Articuno, Hop with Galarian Zapdos, Marnie with Galarian Moltres, Entei, Brandon with Regirock, Regice, Registeel, Regieleki and Regidrago, Palmer with Regigigas, also Primal Groudon, Primal Kyogre, Mega Rayquaza, the Rising Volt Tacklers with the black Rayquaza, Dialga, Palkia, Giratina, Heatran, Arceus, Swords of Justice who are Cobalion, Virizion, Terrakion and Keldeo in his Resolute Form, Reshiram, Kyurem, the Forces of Nature who are Tornadus, Thundurus, Landorus and Enamorus, Xerneas, Squishy who came out by himself as Zygarde at his complete form, the Alolan Guardian Deities who are Tapu Koko, Tapu Lele, Tapu Bulu and Tapu Fini, also Solgaleo and Lunala from Ultra Wormholes, Zacian, Zamazenta, Glastrier, Spectrier and Callyrex.

At the same time it came Solid Snake riding the Metal Gear REX, the whole Belmont clan, Mobians (like in Sonic Forces), Dragon Quest Heroes, fighters from King of the Fighters, Bloody Roar, Virtue Fighters, army of Minecraft Villagers with Iron Golems and domestic wolves, army of Yokais, Plant Army (all the plants from Plants vs Zombies series), STARS soldiers (from Resident Evil), warriors from Soul Calibur, UNSC, Assassins Order from Italy (Assassin's Creed 2), Shaolin monks, Shirai-ryu, Lin-kuei, Special Forces including Sonya Blade, Johnny Cage, Jax Brigs, Kenshi, Taven, Edenians, Osh-teks, Zaterrans (revived thanks to Celica Destiny too), Konohamaru Ninjas (post-time skip version and from Zodiacs' universe), Sailor Uranus, Sailor Neptune and Sailor Pluto from this universe, also Sailor Ves, Sailor Cere, Sailor Palla and Sailor Jun, Pretty Cure 5, Fresh Pretty Cure, Heartcatch Pretty Cure, Suite Pretty Cure, Glitter Force Doki-Doki (Maya Aida aka Glitter Heart, Rachel aka Glitter Diamond, Clara Yotsuba aka Glitter Clover, Mackenzie Mack aka Glitter Spade, Natalie Miller aka Glitter Ace) and Madoka Magical Girl, the Mermaid Princesses (from Mermaid Melody), duelists from Yu-Gi-Oh GX, Yu-Gi-Oh 5D, Yu-Gi-Oh Zexal, Arc-V and Vrains, even Meruem (redeemed and also revived by Celica Destiny), remaining Tekkaman Knights, D-Team and Alpha Gang with an army of dinosaurs with Elemental Armors and Terastallize included, Fullmetal Alchemist allies (including a revived Roy Mustang thanks to Celica Destiny), Soul Society allies, Zoids army, Zenin, Gojo and Kamo clans (from Jujutsu Kaisen; including the deceased members who were revived by Celica), Pro-Heroes from Japan, Akko's schoolmates, Equestrian Army which included royal guards, Wonderbolts, yaks, dragons, changelings, hippogriffs and griffins, Beyblade Metal Fusion and Beyblade Burst gang, also Bakugan Brawlers, all the Autobots and Maximals (across generations), Gundam and EVA units, Middle Earth Army, Narnia Army, Overwatch (recruited by Ashton and to make Overwatch legal again), COD Soldiers, Battleship Yamato troops, Dragons from Berk and Po with the Furious Five, Master Ox, Master Croc and Master Shifu.

"I love you guys!" Po said with excitement and slow camera before landing.

"Is that everyone?" Susumu asked.

"You wanted more." Peppy said.

Just then Ant-Man as a giant along with Ultraman with Emi (a pink baby kaiju), Godzilla and King Kong came to the battle.

"Oh sh¡t, here we go again." CJ said as he appeared for the battle.

*Portals (1:40 to 3:23 - Avengers: Endgame)*

Everyone managed to get up but for extra support, Keith Miller used Life Sanctuary to heal everyone including Tanjiro, Rookester used MAX Power Addition to everyone and the Elemental Field was activated while Muzan was just watching.

"Don't let a single one get away!" Fox said as he pointed his gun.

"Another thing I always wanted to say… SMASH BROTHERS…!" Caleb shouted with excitement before whispering seriously. "Assemble!"

The heroes all gave a war cry as they charged into battle, Godzilla, King Kong and the dinosaur army roared before charging. Muzan said nothing as he pointed one of his whips, motioning his army to charge into battle as well and they did so. All the heroes roared in a war cry as they ran and flew into the fight. It may have not been a Keyblade War, but it was a war they had to win, something that Yoriichi will be able to finish what he started a long time ago, now it's time to end Muzan's reign of terror.

The battle of epic proportions was engaged, on earth and air everyone was ready, the heroes are fighting as team against Muzan's ultimate army, all Muzan's troops are obeying Muzan because they are afraid of them but the heroes' army are working as a true team, specially friends helping at each other during the battle, even Storm launched lightning at the skies to zap a Corrupt Gigadramon, also Godzilla fired his atomic breath against a Corrupt Megadramon destroying it.

*Galeem and Dharkon Battle (Super Smash Bros Ultimate; with lyrics by Man on the Internet)*

During the battle, Caleb went to face Muzan.

"You better surrender while you can, all of your troops will be defeated eventually and you'll be defeated by all of us!" Caleb said as he pointed his schiavona sword at the progenitor of the demons.

"It isn't over until I devour Nezuko to become the perfect and immortal being." Muzan said darkly as his whole body glowed in darkness.

Now with some of the members.

"This is the most epic battle of my whole life!" Inosuke said as he kept fighting and beheading demons, but at the same time inside his mask two light blue-tattooed marks barely resembling boar fangs were there.

"I must do this!" Zenitsu quietly but seriously said before using his Thunder Breathing skills and at the same time manifested black small cracks resembling thunders on both cheeks.

Meaning that both of them manifested their Demon Slayer Marks and during the battle Obanai was seeing his surroundings, he was surprised that he along with Mitsuri were healed during the battle.

"I never thought that Muzan could bring another army like that one…" Obanai whispered before speaking himself in his thoughts. 'However I saw many people dying, especially the Demon Slayers for all of us, I don't know how much longer this new army could take against Muzan's wrath.'

Obanai watched from afar how Muzan punched Caleb away before using his whips to kill the soldiers from different armies along with the cloned troopers, also he used his whips to hit the dinosaurs who were being turned back into cards, the Duel Monsters are being destroyed and the Digimon are being dissipated into digital particles and turned into Digi-Eggs, Muzan tried to destroy them but the eggs were teleported away from the battle.

'I can see why all the demons are a threat not only for this world, also the others, everyone could have more peaceful and carefree circumstances, even if there could not be demons, there are still those Heartless, Nobodies, Unversed and Corrupts Digimon, but Muzan is beyond all those minor enemies.' Obanai said as he tattered the bandages from his mouth and fell to the ground, revealing crossed vein scars. 'If I must die, I must do this during the battle, if I don't then I'm afraid of even being next to you. Kanroji, I am a man from a dirty family who has killed people and taken advantage of others for their own sakes.'

Obanai remembered his past, when he lived in a family of women bandits, they owned a mansion with luxuries included, said family have men born each 370 years, the moment when Obanai was birth he was locked in a cage, most of his life fed like a pig for slaughter because all the newborn boys were devoured by the Snake Demon who was really interested by Obanai who has heterochromia, also his mouth was cut wide open to resemble a snake-like mouth, his blood flowed in a sake cup and the Snake Demon drink it which now explains why his mouth was bandaged most of his years, he realized that he was going to die by being devoured by the demon and somehow he had to escape, only he could trust in his snake pet Kabumaru, after escaping from the prison Obanai ran into the forest but the Snake Demon gave him a chase until she was killed by Shinjuro Rengoku who rescued Obanai's cousin, however she blames Obanai because the whole Iguro was killed and told him that he was a sacrifice and he he should have to stay quiet and let her to eat him, said words struck a bitter chord on his heart, however the younger Obanai wanted to live just like any human but he was born into a crappy family, but Shinjuro take Obanai to his home where he met Kyojuro and Senjuro and with the years, he became a Demon Slayer to unleash his hatred against the demons, however he could still feel the damned souls of the Iguro family using their rotten hands to grab Obanai trying to drag him towards the hell like a living nightmare, but eventually he learned to trust the people, specially Mitsuri and then he remembered that Blake Pierce used his doll to imprison the damned souls of the Iguro family to live in torture for their crimes.

'I was waiting to defeat Muzan and die, hoping that it will cleanse my corrupted blood to later reincarnate as human being's into a world without demons, then I will tell Mitsuri that I love her.' Obanai said in his thoughts.

'You have to leave the past behind ya.' Scorpio's voice told him.

'The damned souls of your family won't torment you more.' Blake Pierce's voice told him.

'Even if Muzan and the demons will be gone, we want you and all the Hashiras to have a better future, especially your help to defeat the other enemy troops.' Aries' voice told him.

'At the same time you could tell your love for Mitsuri, also don't worry when Tanjiro is close to Mitsuri, because Tanjiro has a crush on Kanao.' Cancer's voice told him.

'Zodiac Warriors, Elemental 10, even the other heroes, thanks to them I know to trust in everyone, knowing that Tanjiro saved Mitsuri twice, now it's my turn to return him the favor.' Obanai said in his thoughts and then in his arms, three snake-like tattoo patterns appeared there meaning that he awakened his Demon Slayer's mark, and encouraged him to keep living.

While the heroes are battling, Ignatius and the Kakushi were able to evacuate all the people and now in the battle, most of the heroes were getting poisoned by Muzan's cells but Keith Miller quickly used Life Sanctuary to disappear the poisoning effect from everyone.

"Impossible, no one can survive before my cells…! All it was the Wood Elemental's fault who keeps getting in my way…!" Muzan said quietly before roaring with wrath. "Don't struggle in vain! Just die already, you obsessed freaks!"

Muzan was very obsessed by killing all the heroes as he unleashed his whips to unleash numerous shockwaves across the ground and the buildings as the heroes were able to dodge in time, then WarGreymon and MetalGarurumon DNA Digivolved to Omnimon while Gallantmon transformed to his Crimson Mode, the Digi-Spirits were gathered into Takuya and Koji before using the Unity Spirit Evolution to Susanoomon, the Fusion Fighters Digimon Digi-Crossed to Shoutmon X7, Gaiomon slide evolved to Alphamon and then he along with Ouryumon DNA Digivolved to Alphamon Ouryuken. Then some of the heroes glowed (just like if they use the Smash Ball) as they prepared to combine their attacks ready to hit Muzan Kibutsuji.

Oh yeah!" Mario said as he charged fire in his hands.

"Let's go!" Mickey said as he used his Shotlock.

Mario and Mickey use Super Ragnarok Finale to combine Super Mario Finale and Ragnarok, firing a stream of fireballs and energy spheres at Muzan and the attack creates a massive explosion.

"Let's do this!" Luffy said.

"Banana Slamma!" DK said.

Luffy activates his Fourth Gear, making his upper body and arms larger and then they use Gum-Gum Jungle Rush Organ Gun to combine Jungle Rush and Gum-Gum Kong Organ Gun, delivering powerful rapid punches on Muzan and the Gum-Gum Kong Organ Gun is where Luffy creates two more arms on each side and delivers a Gum-Gum Gatling attack and DK ends by performing an uppercut.

"Ready, Marth?" Kenshin asked him.

"Ready!" Marth replied.

Marth and Kenshin use Critical Hit of the Heavenly Flying Dragon where first Kenshin uses Godspeed to trap All For One in a psychic orb, then Marth and Kenshin use a combination of Critical Hit and Flash of the Heavenly Flying Dragon to do massive damage to the villain.

"Now it's our turn, Link!" Inuyasha said.

"Let's finish this!" Link said.

Link and Inuyasha use Triforce Backlash Wave where first Link traps Muzan in two giant Triforces, then Link and Inuyasha rapidly slashes at Muzan with an attack-like a double Triforce Slash and finally, Inuyasha uses Backlash Wave to trap the villain in a powerful tornado hitting him.

"Moon Eternal Make Up!" Sailor Moon said as she became Eternal Sailor Moon.

"It's time to end this!" Samus said as she prepared her arm cannon.

"And together! Silver Moon Crystal Power Power Kiss!" Sailor Moon said as Samus used Zero Laser.

Samus and Sailor Moon use Silver Moon Zero Laser Kiss where they combine Zero Laser and Silver Moon Crystal Power Kiss with both unleashing their ultimate attack as a massive energy beam of light at Muzan, doing a lot of damage.

"Are you ready, Yoshi?" Keroro asked the green Yoshi.

"Yoshi is ready!" Green Yoshi nodded.

Green Yoshi and Keroro use Yoshi-Keroro Super Dragon to transform into their dragon forms where Yoshi goes into his Super Dragon form and Keroro grows into a giant green dragon with a white tummy and a star inside it, then Keroro slaps Muzan with his tail and he lands in the ground, Green Yoshi and Keroro then uses their Super Fire Breaths on the villain, creating another explosion.

"Better get ready, Kirby!" Hamtaro told him.

"Poyo!" Super Kirby said.

Super Kirby and Hamtaro use Sunflower Ultra Sword to summon their legendary swords where Super Kirby gets his Starlight Sword bigger, while Hamtaro summons his Sunflower Sword from Legend of Courageous Hamtaro, Super Kirby and Hamtaro charge at All For One to deliver rapid slashes with their giant swords, doing a lot of damage and they then deliver one final slash against the villain.

"Get ready, kid." Fox told him.

"Oh yeah!" Naruto said.

Fox and Naruto use Team Star Fox Rasengan where Star Fox called the Arwings to hit Muzan sending him to the air, then Naruto jumped above Fox's Arwing.

"Star Fox, fire at will!" Fox said and the team (Matt Sterling and the others included) fired lasers at All For One and the Star Fox's leader ended by firing a Smart Bomb. "Now Naruto!"

"Rasengan!" Naruto said before jumping and performing Rasengan to send Muzan to crash in the ground.

"Alright, Sceptile, Charizard, Greninja…!" Ash said as Mega Sceptile, Mega Charizard and Ash-Greninja were ready.

"And Duel Monsters…!" Yami said.

"Together!" Ash and Yami finished.

Yami summons his three Egyptian Gods who are Slifer the Sky Dragon, Obelisk the Tormentor, and Winged Dragon of Ra, Mega Sceptile uses Solar Beam while Ash-Greninja uses Hydro Pump and Mega Charizard Z uses Fire Blast while Slifer fires an energy beam from his mouth, Obelisk delivers a powerful punch, and Ra breathes fire from his mouth with the six of them using Egyptian God Triple Finish, Muzan tried to block the attack with his own whips but the attacks overpowered the whips and hit Muzan.

"Now it's our turn, Ness!" Yusuke said.

"Got it!" Ness nodded.

Ness and Yusuke use Spirit Gun Rockin Omega to combine Mega Spirit Gun and PSI Rockin Omega where first, Yusuke charges up his Spirit Gun while Ness charges his PSI Rockin Omega, then they both unleash their ultimate attack as a massive energy beam of light at Muzan, doing a lot of damage.

"Ready, Isaac?" Natsu asked him.

"I'm ready!" Isaac answered.

Isaac and Natsu use Crimson Lotus: Grand Gaia to combine Crimson Lotus: Exploding Flame Blade and Grand Gaia where Isaac and Natsu slam their fists into the ground to create a shower of earth and fire under Muzan, doing a lot of damage to him.

"Now it's our turn, Pit!" Seiya said.

"Alright, let's combine my Final Smash with your Ultimate Attack!" Pit told Seiya.

Pit and Seiya use Sagittarius Sacred Treasures to equip both the Sagittarius Armor and Three Sacred Treasures (just like in Super Smash Bros for 3DS/Wii U and Jump Force respectively), then Pit and Seiya fires a barrage of Light Arrows and Sagittarius Arrows at Muzan, doing a lot of damage to him and ended by summoning pillars of light.

"Ready, Little Mac?" Gon asked him.

"I'm ready for this!" Little Mac replied.

Little Mac and Gon use Giga Mac-Adult Gon Rush, where Little Mac transforms into Giga Mac and Gon transforms into Adult Gon, they then dash towards Muzan and deliver rapid punches at him and finishing with powerful uppercuts, which send him crashing in the ground.

"Looks like it's our turn, Banjo and Kazooie!" Yoh said.

"Let's kick Muzan Kibutsuji's butt!" Kazooie said.

Banjo and Yoh use White Swan Jinjonator where first Yoh activates his Over Soul: Spirit of Sword: White Swan and he creates a giant white arm on his right arm with a katana, then Banjo & Kazooie summon the Jinjonator and it woke up to charge at Muzan, Yoh then uses White Swan Halo Blade to join the Jinjonator to do multiple dash attacks on the villain, doing a lot of damage to him they delivered one final charge at the villain.

"Now it's your turn, Pikachu!" Ash told him.

"Got it!" Ash's Pikachu said.

"Now let's show them the power of the Digimon and Pokémon together!" Tai declared.

Then Ash's Pikachu and Omnimon used Best Buds Supreme 10,000,000 Volt Cannon Thunderbolt with both of them firing bolts and a big ice blast which hit Muzan.

"Let's do this, Mega Charizard!" Davis called him as Imperialdramon was ready.

Imperialdramon and Mega Charizard Z used Positron Fire Laser Blast which both combined their attacks and hit Muzan.

"Together, Mega Sceptile!" Gallantmon Crimson Mode said and Mega Sceptile nodded.

Both of them use Solar Invincible Sword Blade which delivered a huge slash to Muzan.

"Here we go again!" Primal Aidan said as he and the Elemental 10 were ready along with Susanoomon.

The Elemental 10 and Susanoomon used Celestial Elemental Pledge which hit Muzan.

"Together!" Kiawe and Marcus said.

Then both ShineGreymon Burst Mode and Turtonator used Inferno Glorious Overdrive Burst with both of them launching their fire attacks causing a huge explosion which hit Muzan.

"Our turn!" Caleb inside UlforceVeedramon Burst Mode along with Alphamon Ouryuken and Shoutmon X7.

Then UlforceVeedramon Burst Mode used Shining V Force while Alphamon Ouryuken used Ultimate Blade Ouryu-Sword and Final Victory Blade with the three attacks merged and hitting Muzan.

"Let's do this!" Haru and Hiro said together.

"Ultimate Adamas!/Photon Blaster!" Gaiamon and Siriusmon combined their attacks, forming Ultimate Photon Adamas Blaster to hit Muzan.

"Let's do this, Sonic!" Goku in Super Saiyan Blue form said.

"Alright Goku, let's go!" Super Sonic said.

Super Sonic and Goku Blue Saiyan use the Super Sonic-Super Blue Saiyan Attack where both dash attack Muzan at the speed of light multiple times and finally, they unleash a combined Super Kamehameha at the villain, engulfing him in the beam.

"Ready, Megaman?" Super Twilight asked him.

"I'm ready, Twilight!" Megaman replied.

Megaman and Twilight use the Harmony Power Mega Legend where first, Megaman fires the Black Hole Bomb to suck All For One in the black hole, then he, X, and the Mane Six jumps in the black hole and teams up with Megaman Volnutt, Megaman EXE, and Star Force Megaman while the Super Mane Six landed, the five Megamen along with Proto Man, Bass and the Mane Six along with Starlight, Trixie and Sunset Shimmer Awakening Form then fire a multicolored beam that hits Muzan, doing a lot of damage to the villain, and creating an explosion.

"Are you ready, Bomberman?" Buster asked him.

"I'm ready for this!" Bomberman replied.

Bomberman and Buster use the Bomber Jet Ragnarok where first Bomberman summons the Bomber Jet and it straps onto his back and then Buster jumps on Bomberman's back and they fly towards Muzan, Bomberman then threw multiple Red Bombs, while Buster uses Ragnarok to fire multiple red energy spheres with both attacks hitting Muzan, doing a lot of damage to the robot.

"We can do it! We can do it! Heck the canon!" Plucky commented.

"Let's get ready to perform our greatest combination of attacks!" Muscleman said.

"I'm always ready!" Pac-Man said.

Pac-Man and Muscleman use PacZilla-Giant Muscleman where Pac-Man ate a large dark-gray Power Berry while Muscleman ate a whole Garlic, then both increased their sizes and they have godzilla-like size then they delivered a hard stomp against Muzan who didn't have time to block the attack.

"Ready, Simon?" Asta asked him.

"Ready!" Simon replied.

Simon and Asta use Grand Cross Hurricane where first, Simon traps Muzan inside a coffin, then Simon grabs the coffin with his Vampire Killer and throws it high in the air and finally, Simon and Asta uses Grand Cross and Black Hurricane to create a black tornado with giant holy crosses swirling around it, doing massive damage to the villain.

"Ready, Cloud?" Ichigo asked him.

"I'm ready!" Cloud answered.

Cloud and Ichigo use True Bankai Omnislash Ver. 5 where first, Ichigo transforms into his Merged Hollow Form and his Zangetsu transforms into its True Bankai Form, he and Cloud then charge at Muzan and Cloud's Fusion Sword split into five different blades surrounding the villain, the two swordsmen then use Omnislash Ver. 5 and Shunpo to dash attack Muzan with their swords between him and the five blades and they finish their attacks with one powerful slash, doing a lot of damage to him.

"Now it's our turn, Sora!" Sakura (English) said.

"Then let's do this!" Sora said.

Sora and Sakura use Locking The Keyhole, which Sora summons a giant Keyhole to suck Muzan in, then the Keyhole then closes the villain in with a door that shows a sphered symbol (Smash Bros' logo) and a smaller Keyhole, then Sora fires a laser from his Keyblade, while Sakura uses the Lock Card to help seal the Keyhole and the door then disappears with an explosion sending Muzan crashing in the ground.

"Let's combine the power of all the Yokai!" Hovernyan said.

"Got it!" Katie and Nathan Adams nodded and gathered the power of the Yokais into Hovernyan who became a black version of himself called Darknyan while with Whisper and Jibanyan became Buchinyan.

Then Darknyan along with Buchinyan and the Dinosaur Army use Barrage Fusion Move where Darknyan uses Night Claw to attack from the shadows, Jibanyan uses Flurry of Furry to deliver many paw strikes with both hitting All For One, the D-Team and Alpha Gang pass their cards through their Dino Bracers and Alpha Scanners respectively, Chomp uses Final Thunder, Ace uses Ultimate Wind, Paris uses Ultimate Leaf, Terry uses Ultimate Fire, Spiny uses Ultimate Water, Tank uses Ultimate Earth, Carcharodontosaurus uses Fire Cannon, Maisaura uses Diving Press, Utahraptor uses Atomic Bomb, Styracosaurus uses Lightning Spear, Ankylosaurus uses Mole Attack, Torosaurus uses Lightning Strike, Pachycephalosaurus Laser Ray, Daspletosaurus uses Fire Bomb, Euoplocephalus uses Quake Saber, Anchiceratops uses Death Grind, Therizinosaurus uses Gyro Claw, Deinonychus uses Spinning Attack, Pentaceratops uses Thunder Bazooka, Sauropaganax uses Magma Blaster, Stegosaurus uses Spike Arrows, Allosaurus uses Mayfly, Ampelosaurus uses Aqua Vortex, Fukuisaurus uses Emerald Garden and Megalosaurus uses Zero G Throw with all the attacks forming a rainbow of moves all of them hitting Muzan.

"Aries, let's do the same unity attack again!" Shulk told him and the aries warrior nodded.

Stellar Zodiac Warriors and Shulk and his friends use Zodiac Chain Rush Attack which they all attacked together at Muzan with their respective weapons and Leo with Shulk finished by performing and jumping slash against the villain.

"It's our turn now! C'mon Blue Falcon!" Captain Falcon said and his Blue Falcon hit Muzan sending him into a track of the place.
Captain Falcon and Deku performed 100% Blue Falcon Smash where the Blue Falcon rammed Muzan and then he was punched by Deku who used 100% Delaware Detroit Smash sending the progenitor of the demons to the ground, but Muzan got up angrier than before.

"Holy!/Divine Slash!" Ky and Noel combined their attacks which hit Muzan.

"Now you see it Muzan, this is all the power we have, even if you have begged for more power just like a coward would do, teamwork and our will is the only thing that makes us stronger!" UlforceVeedramon BM told him.

"NEVER!" Muzan yelled as he unleashed more whips but UlforceVeedramon used Tensegrity Shield to block the enemy attack.

Before Muzan could attack again, his right arm was sliced like that.

What happened to this severed section?" Muzan asked himself. "Who could be?"

Just after Muzan regenerated his right arm, his left arm was sliced too.

"Again with this severing… It's from a blade that isn't very sharp, one that's full of ridges." Muzan said quietly until he realized. "I get it, they're here, I can't see them but they're here! Even if they use Tamayo's Blood Demon Arts to hide, as long as they're moving, they can't erase their presence! Six people in total!"

Then he unleashed his whips as he was able to hit Luke, Aria, Seth, Inosuke, Zenitsu and Kanao who had the talismans who made them invisible.

"God damn it…!" Luke cursed.

"So much for being invisible…!" Seth grunted.

"Muzan still has a lot of energy…!" Aria said with a grunt.

"I hate this!" Zenitsu yelled.

"I didn't think he'd notice this fast…!" Kanao added.

"You little maggot!" Inosuke shouted.

"Let's do this again!" Sailor Mars said as she jumped and tossed the talismans which allowed Seth, Luke, Aria, Zenitsu, Kanao and Inosuke to be invisible again, then Kanao used Flower Breathing Fourth Form while Zenitsu used Thunder Breathing First Form, Seth unleashed Twilight Energy Blades and Aria used Stone Axe.

"Stop with the pathetic schemes! You pathetic weaklings!" Muzan yelled with rage, still believing that he is superior to everyone.

"Clash their weapons! It will turn your blades red!" Aries shouted.

Then just as he said, the Hashiras with the awakened Demon Slayers' marks clashed their weapons allowing them to use Red Glowing Nichirin Swords and started to attack Muzan Kibutsuji nonstop.

"Caawww! One hour and three minutes until dawn!" The kasugai crow called.

"More than enough time, we'll shred you into pieces!" Sanemi told Muzan.

'We're gaining the advantage! But we must be ready for everything!' Caleb said.

Then Examon appeared along with Aria who was Bio-Emerged as Dianamon and Seth was Bio-Emerged as Apollomon Bipolar.

"Sun Ball Blast!/Arrow of Artemis!" Apollomon Bipolar and Dianamon combined their attacks.

"Take more talismans!" Sailor Mars said as she gave more talismans to the team members to attack invisibly at Muzan and much for his irritation.

"Muzan has 7 hearts and 5 brains!" Aquarius said as he was using the visor from his jaeger armor.

The group continued dodging Muzan's whips and attacking the Progenitor of the Demons.

"ENOUGH!" Muzan said as he used an instant Off Waves attack which hit everyone, the heroes and the heroes' army alike, even the giant ally beasts, producing major injuries to everyone including Michikatsu, luckily no one of them was mutilated or sliced, most of the Duel Monsters were destroyed, the dinosaurs were turned back into cards, the Mega Evolved Pokémon reverted to their regular forms and Mega Digimon from the human partners were reverted to their training forms, even others Digimon were destroyed and turned into Digi-Eggs, multiple foot soldiers were killed, also the ones who were in Super Forms were reverted to their regular forms.

Apparently Muzan's patience reached his breaking point and said the attack was so strong that it destroyed Kanao's katana as she collapsed in her knees, luckily Shinobu and Kanao approached to protect their little sister.

"It's so strong and fast…!" Kanao said in shock.

"No…" Sora said as he tried to summon his Keyblade but Muzan stomped his right wrist while breaking his bones causing him to groan in pain.

"That was the last time you summon your Keyblade." Muzan told Sora before leaving him there.

Muzan kept approaching the Butterfly Sisters.

"We must defeat that monster…" Aria said as she was trying to get up but she was coughing blood. "So everyone can live in peace… nobody will be burdened with sad memories… It's his fault everyone's families were killed…"

"Heal…!" Caleb casted Curaga to himself and healed his injuries.

Despite Sora's right wrist being in pain, he managed to cast Curaga to heal Tanjiro, knowing that his Sun Breathing is the only thing that can harm Muzan.

"Such foolishness for the Insect Hashira to come here..." Muzan said as he watched that Seth had a lot of injuries after protecting Shinobu who had few injuries and her uniform a little blood stained. "I still didn't forget when I was waiting for Doma to kill her, but I'll do the job that Doma wasn't able to finish...!"

"No! You have to kill me first if you want her!" Seth said as he stood protectively in front of her, even Caleb and Sara stood in front of Seth and the Kocho Sisters.

"Back off, Muzan…" Caleb said through gritted teeth. "You're not touching them…!"

"Why not? She is Hashira like all the others, all of them are obstacles for my goals, the Flower Hashira was killed by Doma before and she must be dead again and forever, and therefore she like the others Hashiras are supposed to die, all of you must know that you cannot bring humans back to life." Muzan said, referring to Kanae's previous death before being revived.

"How dare you talk about their lives like that…!?" Caleb said, his voice shaking with rage. "They're not just obstacles to be eliminated, they're heroes who fight to protect others! And they're not just numbers, they're humans with their own stories, their own dreams, their own futures! You have no right to decide who lives and who dies."

"If you think that my sister was revived it is a crime... You're wrong!" Shinobu told Muzan, despite being shaken emotionally after Seth's sacrifices but gained enough courage even if she is not the strongest Hashira of the group. "My sister being revived just like every person you or your demons killed is a gift more than a crime against your twisted nature...!"

"And if someone is against nature, it is you, Muzan...!" Sara retorted to Muzan who scowled at them.

"My sister and Shinobu are right…!" Caleb said, his voice steady and firm. "Your attempts to play God and impose your own twisted vision of the world are the true crime here! You've caused nothing but destruction and death, and for what? So you can live forever and rule over a world you've destroyed? You had your chance in your human life and you disregarded it after becoming a demon just for immortality...! You think you're above us, but you're really just a coward! You're afraid of death, afraid of change, afraid of losing control!"

"Death chased me everywhere around my human life during my illness..." Muzan snarled.

"And you turned your thanatophobia into hatred against humanity!" Sara replied to Muzan while narrowing her eyes.

"You let your fear and hatred consume you…!" Caleb said, his voice firm and steady. "You let it twist you into something monstrous, something evil…! And now look at what you've become…! You're a demon, you're nothing more than a shadow of your former self…! You've lost everything that made you human…!"

Before Muzan could say something he was slashed by a familiar technique.

"Hinokami Kagura: Beneficent Radiance!" Tanjiro said as he performed the attack to slash Muzan's back while Tanjiro landed fine, still having his two eyes working.

"Tanjiro…" Kanao said with tears of relief as the kakushi arrived.

"Take them away…" Tanjiro told the Kakushi who nodded before taking the Butterfly Sisters away from the battle.

"Well, look who decided to show up?" Muzan asked.

"And you look more repulsive…!" Caleb commented sassily.

"But who is the demon now?" Muzan asked.

"You the whole time…!" Caleb retorted.

"I'm not talking to you, I'm talking to Tanjiro Kamado, the same person who shares similarities with Yoriichi Tsugikuni." Muzan said.

"Let's put an end to this, Muzan Kibutsuji." Tanjiro said stoically.

"And fight against me too." Caleb added.

"Very well, as you wish, Caleb Lhantis." Muzan said.

While Caleb was facing Muzan, Tanjiro flashbacked when Yoriichi received flowers as gift to cheer him up, later he performed the Sun Breathing like an spectacle and then gifted the Hanafuda earrings to Sumiyoshi Kamado and from that point Sumiyoshi passed the Sun Breathing through his descendants, generation after generation and even a thankful Yoriichi thanked Sumiyoshi said goodbye to Sumiyoshi, now that makes sense, the Kamado family met Yoriichi in the past and that's why Muzan wants to see all the Kamado family disappeared.

"What is your plan?" Caleb asked Tanjiro.

"Easy, now I know how the Sun Breathing originated. I must perform the 12 forms of the Hinokami Kagura repeatedly until dawn, but I'm not experienced like Yoriichi or my father…" Tanjiro whispered to Caleb.

"Then do it, you won't know until you try, and besides it's the only way to defeat Muzan…" Caleb whispered back to Tanjiro.

"Are you done whispering? It's very rude." Muzan told them.

"Well, I'm glad to be rude towards you." Caleb sassily told Muzan.

"Now we'll set our hearts ablaze!" Caleb and Tanjiro said at the same time, the Digidestined of Destiny clashed with his own weapons making their blades glowing red like the nichirin swords and then clashed Tanjiro's katana making him glowing red too.

Tanjiro was surprised in seconds before recomposing himself and then engaged Muzan again, while Tanjiro performing the attacks, Caleb was jumping while swinging his weapons and casting different spells to protect Tanjiro from being injured during the battle, even Caleb tossed a talisman to Tanjiro which turned him invisible and used his own talisman to be invisible too, then Tanjiro performed Hinokami Kagura Dance which slashed Muzan who had a flashback about Muzan.

"A ghost…!?" Muzan growled in shock.

While Tanjiro kept fighting against Muzan, Caleb was protecting him.

'Creatures who catch a glimpse of the precipice of death become even more tenacious and I know this in order to avoid death you open the door of strength and perception that are unnecessary during your regular life, those who do not open the door will die, but those who open the door when he was on the verge of death. However, it's not enough. You are leagues away from reaching Yoriichi and the other is far from reaching the level of his ancestors.' Muzan said in his thoughts while facing Tanjiro and Caleb.

Tanjiro performed Clear Blue Sky, Raging Sun, Burning Bones Summer Sun, Setting Sun Transformation, Solar Heat Haze, Beneficent Radiance, Sunflower Thrust, Sun Halo Dragon Head Dance, Fire Wheel, Fake Rainbow and Flame Dance.

'He is making it! He is making it! Don't stop until dawn!' Caleb said in his thoughts as he kept blocking Muzan's attacks and protecting Tanjiro and at the same time Muzan's attacks were turning slower.

'What? Their movements are lackluster and slow, that hasn't changed. Exhaustion will naturally set in the more they move because they are humans, but if that's the case then why can't I finish off two humans who are burdened with fatigue?' Muzan questioned himself in his thoughts until he realized something. 'No…! I'm the one who's slow…! That has to be it, otherwise, this one-on-two duel wouldn't have lasted this long, I would never fail to finish someone off twice, the reason has to be that woman, I'll bring back Tamayo's cells that I absorbed…'

Just as he said in his thoughts he summoned Tamayo's head.

"What did you do to me? Wasn't the medicine you used on me supposed to turn me human?" Muzan asked Tamayo's head which was being regenerated.

"The drug I used… Turns you into a human… And…" Tamayo was speaking quietly before changing to a malicious expression. "I'm not telling you, why don't you try using all those useless brain cells you now have?"

Then Muzan crushed Tamayo's head again.

"I'll look through the memories left in her cells." Muzan said as he watched through Tamayo's memories as she saw her working with Shinobu. 'Yes, it's the same Insect Hashira that Doma failed to kill her, but I should have killed her when I could…!'

As he saw Tamayo's memories, he saw when Shinobu suggested to create a hybrid drug as a cover-up plan, in case that the drug which was supposed to turn Muzan into human would fail, another one was created to age Muzan by fifty years per minute and then the King of the Demons returned to the present.

"Aging! I see, so I've been continuously aging…!" Muzan said in realization.

"Finally..." Caleb said before laughing like a maniac.

"Are you making fun of me? The King of the Demons!?" Muzan asked Caleb angrily as he stopped to attack and Tanjiro also stopped in minutes and was a bit confused after hearing his maniac laugh.

"You're not the King of the Demons! You're the King of the Cowards!" Tanjiro said as he narrowed his eyes with determination and renewed anger.

"Also, Tamayo's sacrifice was not in vain, we see that she gave you what you wanted, live for more years, 50 years each minute, therefore you are aging at the shortest possible time." Caleb smuggly told Muzan.

Muzan's face darkened as he realized the truth of Caleb's words. The realization that he was aging rapidly was a cruel irony, a fitting punishment for his centuries of tyranny.

"No…" Muzan growled. "This can't be happening. I am the King of the Demons... I am immortal…"

Tanjiro listened to Caleb's words, a flicker of satisfaction passing over his face. He could see the anger and panic in Muzan's eyes, the desperation in his movements. Muzan was realizing the truth, that he had been played like a fool, the moment where Muzan felt the real fear after 1,000 years.

"You're right." Tanjiro said, his voice firm and steady. "Tamayo's sacrifice wasn't for nothing. She deceived you and used your own arrogance against you."

"Now let's end this dance to death!" Caleb told Muzan.

"Very well!" Muzan said.

"Time to finish this!" Tanjiro said.

During the battle, Tanjiro continued performing the 12 more forms of the Hinokami Kagura or Sun Breathing, now faster and more accurately and kept repeating the cycle of twelve while Caleb kept protecting from Muzan's whips.

"Keep going Tanjiro, we can win this!" Caleb said.

Meanwhile, back with the others, Yuchiro managed to reattach Chachamaru and then Keith Miller used Life Sanctuary to heal everyone.

"Please Tamayo, protect Tanjiro and Caleb." Yuchiro begged tearfully. "Please protect them somehow, I'm begging you."

Now in the battle against Muzan, Tanjiro kept performing the Hinokami Kagura twelve forms but Tanjiro was getting tired and his vision was getting blurry.

"Tanjiro, use your sense of smell!" Caleb shouted as he slashed two Muzan's whips away.

Tanjiro nodded, understanding the suggestion before closing his eyes to focus his sense of smell, his nose was twitching, taking in the faint scents that surrounded him and also the images of the items and living beings manifested as neon signs, even if the invisibility talismans fell the two of them continued fighting, just then Obanai appeared from nowhere and used his Serpent Breathing to save both from a barrage of whips sent by Muzan, Caleb and Tanjiro nodded in thanks at Obanai who nodded back at us as he returned the favor, Tanjiro managed to open his eyes not seeing blurry anymore, just then they saw that Muzan's body was manifesting black burnt scars and Muzan's eyes widened in shock as his scars were manifesting.

"Those are… old scars…" Caleb said in realization.

"The wounds Yoriichi inflicted on him, they never healed after all these centuries, Muzan's cells are continually being burned…" Tanjiro said as he was sweating a lot. "So, these wounds are Muzan's weak spots! Yoriichi is guiding us!"

"Later we'll thank Yoriichi…! We have to keep fighting…! We have to win!" Caleb said as he was sweating a lot too.

"Yes, for the sake of everyone who has suffered at Muzan's hands!" Tanjiro added.

Then they continued fighting, Tanjiro performing again the Sun Breathing sequence and Caleb kept protecting him from Muzan's mortal whips.

'The first time I saw him, he looked very weak.' Muzan said in his thoughts as he flashbacked his first encounter against Yoriichi. 'There was no ambition, no willpower, no hatred, and no killing intent, yet that man would decapitate and slash at me, moreover, the wounds he gave me have continued to burn my flesh for over hundreds of years, like the sun, not even the gods or Buddha could have predicted that.'

"It only seems like a stupid fairy tale!" Muzan roared as he flashbacked Yoriichi in Tajiro's place. "The real monster was that man, Yoriichi! Not me!"

"You keep acting like a coward, Muzan Kibutsuji!" Caleb told Muzan.

Tanjiro's grip on his sword tightened as he listened to Muzan's words. He could feel the anger and frustration boiling inside him at Muzan's continued attempts to justify his actions.

"You're the one who's acting like a coward, you're the real monster!" Tanjiro said through gritted teeth. "You've been running and hiding for centuries, avoiding the sun and the hunters who seek to end you! But now you have nowhere left to run!"

"Forty minutes until dawn!" The kasugai crow said.

*Ends*

Then Muzan ran away.

"He is running away!" Tanjiro said in disbelief.

*Against the Dark Knight (Fire Emblem: Path of Radiance)*

"That crappy coward won't escape from us!" Caleb said before using high flowmotion and dashed at high speed.

Caleb could see that Muzan was going to step through the corpses of Demon Slayers of Lower Rank but then he used shotlock technique which summoned chains which tied Muzan and Caleb held both feet on the ground and pulled Muzan away from the corpses.

"You thought I was going to let you get away like that, you damn coward!" Caleb angrily said as he was pulling Muzan.

"Why do you try so hard to protect those corpses, of all those pathetic humans who died before me as your entire human race is, those deaths show how weak humans are when they are killed by me, only demons are fit to live in this world." Muzan said as he was hardly moving and trying to stomp one of the corpses.

"You sick ba$tard!" Tanjiro shouted, feeling his anger boiling as he watched Muzan attempt to trample over the corpses of the fallen Demon Slayers.

Clearly after hearing Muzan's arrogant and dismissive words about the human race only fueled his anger further.

"Now what!?" Muzan growled as he turned to see Tanjiro tossing those swords at Muzan.
Tanjiro's eyes were cold and hard as he looked at Muzan.

"You have no right to speak about the human race like that!" He said firmly. "These people may be dead, but they died fighting to protect others from the likes of you and your demons! They are heroes, not weaklings! You don't deserve to trample over their corpses!"

Even the Zodiacs Warriors and Elemental 10 plus Corona, Winter, Krisi, Matt Sterling appeared, healed but at the same time very angry as they heard that Muzan insulted the ones who died in battle.

"For every deceased human you insult the memories of the Sentai Rangers and Kamen Riders who died!" Aries angrily said.

"You also insulted the memory of my grandma!" Assana angrily told Muzan.

"I won't let you insult the memory of my late mother, nor the memory of James McCloud!" Matt Sterling firmly said.

"And neither the memory of my late friend Blitz!" Aaron said, showing fury than everyone else before using Illuminate Javelin as the attack pierced through Muzan's neck and pushed him far away from the corpses, they tried to attack but Muzan used the Off Waves without charging while hitting them, only Tetsu was able to use his shield in time to block the attack.

"I warn you not to abuse the new power I gave you." Tabuu's voice told him.

"Spare me your warnings, I'll do anything to destroy those heroes!" Muzan retorted to Tabuu.

"Very well, later don't tell me that I didn't warn you." Tabuu told him before disappearing.

But then Tetsu tossed his double-edged sword piercing through Muzan's waist pinning him against the wall.

*Ends*

Meanwhile, very far from the town, Nezuko managed to arrive, however she was flashbacking the memories when her mom and siblings were killed by Muzan and she was grabbing her head tightly in pain.

"My family…!" She said, struggling against the pain.

(Academy of the Omniverse)
The situation in the Academy of the Omniverse was calm, there weren't any enemy troops.

"It is time." Yen Sid told Kie with Tanjuro and their siblings.

They nodded slowly, even Tanjuro gave a reassuring nod to Rokuta.

Then the sorcerer teleported them back to Japan.

(Taisho Period: Town)
They managed to arrive and coincidentally they are close to Nezuko.

"Nezuko…" Kie called her.

"Mom…" Nezuko said as she was sniffling, seeing her family alive after terribly experiencing that flashback.

"Come here…" Tanjuro called her.

Without wasting time, Nezuko cried as she hugged both parents, eventually the siblings started to cry too during the embrace, Yen Sid closed his eyes understanding their situation until Takeo gained enough courage to speak with the sorcerer.

"When will we go to see Tanjiro, Master Yen Sin?" Takeo asked.

"Not yet, young Takeo, if we go, Muzan will focus on killing you again." Yen Sid told them.

Knowing that he is right, they need to wait a bit longer. And now back in the middle of the battle, Muzan was still stuck by Tetsu's sword.

"Thirty-five minutes until dawn!" The kasugai crow said.

Just then Muzan increased the size of his left arm.

"Oh no… He is splitting apart, if he does that, he will split into tiny pieces to escape…!" Caleb said in shock.

But then nothing happened and Muzan's left arm returned to his regular size.

"I knew it…!" Aries said with satisfaction.

"I can't split myself apart…!" Muzan said in shock. "I see now there were three drugs, reverting back to human, aging and preventing self-splitting! That cunning fox…!"

Just then Tamayo started to manifest herself as a spirit.

"Oh so close, but you're wrong…" Tamayo said maliciously and then Muzan started to vomit blood. "There's actually four, thanks to the third drug, the one that destroys your cells at their weak points is now starting to take effect. Well, well, it looks like the death you've hated for so long is right before your eyes now. I don't need to be stronger than you to kill you, I can just make you weaker, just as you'll do whatever it takes to stay alive, I… No, we will do whatever it takes to kill you."

Muzan was getting weaker every minute right now, his time is close to end.

'Normally, all of this would be meaningless, neither the slashing attacks nor the damage from the shining red blades has ever worked on me, not even the attacks from those otherworldly heroes, I'm superior that all of them and I have never accumulated any fatigue from regeneration. But four drugs made all those useless attacks into effective ones that drove my flesh into a corner. I never expected that woman to create such powerful drugs in such a short amount of time and they're completely different from the ones used on Doma. This is the first time I've experienced these drugs, I need time to analyze and decompose them.' Muzan said in his thoughts.

Then without warning, he unleashed another but powerful instant Off Waves which hit Caleb and Tanjiro, and also tossed Tetsu's double edged sword, making them hard to move after receiving the enemy attack and then Muzan's body unleashed more sharpened teeth through his body and unleashed his whips which killed another kasugai crow.

"Only twenty-five minutes remain…!" Caleb tiredly shouted.

Just then, Inosuke and Zenitsu along with the otherworldly heroes came to fight Muzan but again Muzan unleashed the Off Waves attack which hit the heroes and injured them while the Hashiras are arriving eventually, but Caleb quickly managed to get up before grabbing borrowed Tetsu's double-edged blade and twirled it like a propeller to block the whips sent by Muzan, he kept swinging until tossing the double-edged sword which pierce through Muzan's waist and pinning him against another wall, then Tanjiro managed to use Sunflower Thrust which was used to struck through Muzan's chest still pinning him against the wall, however the shining red effect was fading away slowly from his katana, but then Caleb prepared to use Fire Edge but now with his schiavona sword and then mimicked Sunflower Thrust to stab through Muzan's mouth to prevent to eat Tanjiro before casting Blizzaga with his Keyblade to freeze his mouth and pulling the schiavona away.

"Tanjiro, the shining red effect from your katana is fading away, there's no time, use your head!" Caleb told him and then Tanjiro realized about using his hard head (inherited from his mother), but literally to slam it against Muzan's head.

Tanjiro's heart was racing as he listened to Caleb's words. His mind was swimming with exhaustion, but he knew that they had to keep going. They were so close to defeating Muzan, but he knew they were running out of time. Then he remembered his mother and her words: "Use your hard head, dear." And Without hesitation, Tanjiro charged forward and slammed his head against Muzan's head with all his strength.

"Keep going, Tanjiro, the dawn is coming!" Caleb shouted with anxiety, telling him to keep using the head.

Tanjiro continued to slam his head against Muzan, putting all of his determination and willpower behind each strike. He could feel the exhaustion and pain in every inch of his body, but he pushed on. He had to keep going. The dawn was close, and they couldn't afford to fail now.

But suddenly Caleb felt that Muzan is charging energy coming from his left palm, meaning that he will unleash another shockwave attack and Caleb gasped.

"Tanjiro, look out!" He shouted before pushing Tanjiro away from Muzan's close attack, Tanjiro couldn't help but watch in camera slowly how Caleb held both of my hands into Tetsu's double-edged sword and Tanjiro's katana and then Caleb received Muzan's shockwave which hit him so strong since he is close but also Tanjiro received the attack luckily he wasn't mutilated while Caleb felt cuts across his body and intense bleeding.

Tanjiro watched in horror as Caleb took the full brunt of Muzan's shockwave attack, Tanjiro's body being thrown back by the force of it. He watched as cuts and blood appeared all over Caleb's body.

"Caleb!" He shouted in alarm, his voice filled with concern.

Said shockwave broke the ice which froze Muzan's mouth.

"Another one who will die pathetically...!" Muzan said sadistically as then unleashed his whips to stab his back repeatedly. "Why my cells aren't affecting you!? Why aren't you turning into a demon!?"

Just as Muzan demanded as he kept using his whips to hit Caleb nonstop.

"I'll tell you a secret, I have the Steel Soul's ability which makes me immune to your poison and even your cells, Muzan!" Caleb told him as Tanjiro was able to hear him.

Tanjiro's eyes widened in surprise at Caleb's secret. So that was why he wasn't being affected by Muzan's cells or his poison.

"Steel Soul…" Tanjiro whispered to himself, committing the word to memory.

"And taking advantage of my skill, I will keep you until dawn, even if it means dying with you! Both of us will die together!" Caleb declared to Muzan as his eyes widened in horror how the sun was arriving, but then he showed a twisted and evil smirk.

"No, you are the one who is going to die!" Muzan said before unleashing another shockwave, even if it mean to abuse his own power to hit Caleb and push him back crashing against many walls while the schiavona sword landed close to Tanjiro but Tanjiro's katana is with Caleb and double-edged sword landed close to Tetsu.

Tanjiro watched in horror as Muzan unleashed a powerful shockwave, pushing Caleb backwards and crashing into the walls of the buildings.

"No!" He gasped, his heart thudding in his chest as he watched his friend being brutally battered.

Then Muzan increased his own size bigger like a titan, to hold against the sunlight and without warning he stomped Caleb, with his right foot, everyone saw with shock and horror, Zodiac Warriors, Elemental 10, the Hashiras, Zenitsu, Inosuke, Genya, Kanao, Makomo, Sabito, Murata, Corona, Winter, Krisi, Seth, Sara, Luke, Rei, Ila and Tanjiro.

*Elise's Tears (Sonic the Hedgehog 2006)*

"CALEB!" Aria yelled tearfully and in despair.

"Caleb!" Everyone who saw Caleb's death shouted in despair.

Tanjiro watched in horror as Muzan stomped on Caleb, crushing him under his huge foot. He could hear the collective gasps of shock and disbelief from everyone around him. He could see the tears running down Aria's face, expressing the despair and anguish they all felt at Caleb's fate.

"No... Caleb..." He whispered, his voice filled with sorrow, only he watched Caleb's Keyblade of Destiny close to Tanjiro himself.

"Yes, Caleb Lhantis is dead!" Muzan said triumphantly and wickedly. "The legacy of the Chosen One by Destiny is finally over!"

"No... NO!" Aria shouted tearfully in despair as she was being held back by Shinobu and Kanae who also had tears in their eyes.

"Silence!" Muzan shouted, silencing Aria forcing her to stay quiet but still sobbing quietly before berating her. "You stupid girl! Caleb is gone, from now on your faith will be safer with me."

The room was filled with a heavy silence as Muzan's words sunk in. Everyone was struggling to come to terms with the brutal reality of Caleb's death. Tanjiro's heart clenched in pain, his mind reeling with the loss of his friend.

"You ba$tard..." He muttered through clenched teeth, his eyes fixed on Muzan with a look of hatred and determination.*

*Ends*

However, after seeing Caleb dying like that, Tanjiro didn't have enough anger, only he could feel sorrow, he couldn't help but see Aria crying softly as she was being hugged by Shinobu and Kanae who still have tears in their eyes, feeling so bad for Aria.

Tanjiro's heart ached at the sight of Aria crying softly, being comforted by Shinobu and Kanae. He could see the pain and sadness etched on their faces, their tears falling silently.

He couldn't help but feel helpless, knowing that there was nothing he could do to ease their pain. The loss of Caleb had left them all broken and raw, their hearts heavy with grief and despair.

"Caleb Lhantis is dead! The time has come for his final judgment!" Muzan wickedly said before turning to see the survivors. "Join me or die!?"

The surviving Demon Slayers and heroes tensed, bracing themselves for Muzan's ultimatum. The tension in the air was thick as they waited for Muzan's next words.

Just then Rei, Caleb's cousin, gained enough courage to walk towards Muzan.

"Can I say some words?" Rei asked Muzan.

"Of course, what's your name, young boy? Maybe it can give rise to be one of the new Upper Moons." Muzan in a so-called gentle tone told Rei.

"My name is Rei Miura." Rei introduced himself.

The other survivors watched in surprise and curiosity as Rei, Caleb's cousin, stepped forward and addressed Muzan. Genya tried to stop him, but Rei continued walking, determined to speak his mind.

"Rei Miura..." Muzan repeated, his demeanor becoming more gentle. "And what words do you wish to say, young Rei? I hope I can be moved by your words."

"It doesn't matter that Caleb is dead...!" Rei said seriously despite the tears in his eyes.

"Quiet, Rei..." Genya told him but Rei continued.

"People die every day, friends, family, I know it is very painful, today we lost Caleb...!" Rei said with sorrow before recovering himself with determination. "But his death was not in vain, yours was, because you are wrong, Caleb's heart beat for all of us, this is not over yet!"

Just as Rei spoke, his words lifted the spirits of everyone while Muzan smirked evilly.

"If you want it, then so be it..." Muzan said, preparing himself as everyone of the heroes shield themselves.

But then Caleb's Keyblade disappeared from nowhere which confused Tanjiro and also Muzan who then stopped himself and was confused about why Caleb's Keyblade disappeared.

Tanjiro's eyes widened in shock as he watched Caleb's Keyblade disappear from where it was lying near him. He was confused and bewildered, wondering where it could have gone.

Muzan, too, was taken aback by the sudden disappearance of the Keyblade. He stood there in confusion, his eyes darting around, trying to figure out what had just happened.

"There's one more thing about the Keyblade, the Keyblade chooses its wielder, when the wielder dies the Keyblade stays there in its place, when the Keyblade is separated from its wielder the Keyblade always returns to its wielder." Sara explained to Tanjiro by whispering, enough that Muzan cannot hear them while Tanjiro was slightly surprised, meaning that Caleb is alive but where.

Tanjiro listened intently to Sara's whispered explanation about the Keyblade. His heart skipped a beat as he realized the implication of her words… the Keyblade had disappeared because Caleb was still alive.

His mind raced as he tried to figure out how that could be possible. Caleb had taken the full brunt of Muzan's attack, just like Tanjiro had done himself. There was no way he could have survived.

Just then Muzan felt something moving below his right foot, he gasped as he tried to stomp further but it didn't work.

"Go to... Go to... Go to hell... Go to hell, Muzan Kibutsuji!" Caleb yelled at the top of his lungs while casting Mega Flare which he unleashed a pillar of flames and then tossed Muzan away causing to fall down while everyone was caught in shock and surprise as Caleb managed to survive while wielding the Keyblade of Destiny back in his right hand and wielding Tanjiro's katana in his left hand.

*The World to Win (Kirby Triple Deluxe)*

The heroes gasped in shock and disbelief as they watched Caleb rise from the ground, keyblade in hand. Despite the horrible injuries he had sustained, he was standing there alive and defiant, facing off against Muzan once again.

"I need your katana, Tanjiro!" Caleb spoke seriously while manifesting a fiery aura like the sun, he just nodded before he attached Tanjiro's katana to his Keyblade forming a larger blade.

Tanjiro nodded, understanding the look of desperate determination in Caleb's eyes. He knew that Caleb was planning something, something he hoped could be their last-ditch effort to defeat Muzan once and for all.

He watched as Caleb connected Tanjiro's katana to his Keyblade, the two blades merging together to create a larger and more formidable weapon. Tanjiro couldn't believe what he was seeing. Caleb was standing there, his body battered and bloody from the harsh beating he had taken from Muzan. He had seen the full force of Muzan's attacks, the intense and painful looking damage it had caused, and yet here he was, alive and standing. Tanjiro couldn't help but blurt out the first thing that came to his mind.

"How... How are you still alive?! You took so much damage from Muzan! You should be dead right now!" He said in shock.

"Honestly I never felt so alive especially after seeing all my life flashing through my eyes but then I heard the voices of the wielders from the past who wielded my Keyblade before me, including my father and grandfather." Caleb explained to Tanjiro.

Tanjiro listened in awe as Caleb shared what he had experienced.

"You heard the voices of past wielders? Your father and grandfather...?" He repeated, incredulous.

"Yes, now I need my schiavona back." Caleb said before grabbing the handle of his Keyblade with his teeth, Tanjiro have to him the schiavona sword and then summoned the Keyblade of Darkness in his left hand before attaching said sword to the Keyblade from his left hand forming another long blade and then he grabbed the one from his teeth back to his right hand. "Got it!"

Tanjiro watched as Caleb wielded the two Keyblades, the light one with his katana combined and the one of darkness combined with the schiavona sword combined. He couldn't believe his eyes.

"You... You're wielding four weapons at once..." He managed to say, his eyes wide in shock.

"I didn't know it until now." Caleb told him as he was holding both of his long and improved Keyblades.

Tanjiro could only shake his head in astonishment. Caleb had surprised them all once again with his incredible powers. Not only had he survived an attack that should have been fatal, but now he wielded four powerful weapons at once.

"You're full of surprises, Caleb…" He muttered.

Just then Muzan got up, angry but mostly confused.

"Impossible... No human can't survive against my attacks like that...!" Muzan said in disbelief.

"You completely forgot that I'm stronger than previous wielders of my Keyblade through many years, meaning that I'm now stronger than my father..." Caleb firmly told Muzan.

Muzan stared at Caleb, his face a mixture of anger and disbelief.

"You... You think you're stronger than your father just because you're wielding that Keyblade?" He sneered contemptuously. However, there was a hint of uneasiness in his voice, as if he was suddenly realizing the danger Caleb posed but then Muzan summoned Neoshadows.

"Neoshadows, they are not demons, but Heartless, use your breathing skills to destroy them easily...!" Sara instructed.

"Take it!" Rei said as he tossed a katana for Water Breathing for Tanjiro.

Knowing that he is mostly tired of using the Hinokami Kagura, he nodded before returning to use the Water Breathing.

"Kill them all!" Muzan told his Neoshadows to kill the Hashiras, Zodiacs, Elementals and the others.

"Tanjiro, I'll fight against Muzan, you take care of the Neoshadows!" Caleb instructed Tanjiro.

Tanjiro nodded, his eyes fixed with determination.

"Understood, I'll take care of the Neoshadows. You take care of Muzan." Tanjiro said and with a firm grip on his katana, Tanjiro turned his attention to the Neoshadows, ready to take them on.

Then Tanjiro came back to use the Water Breathing skills but also realized that Kanao's katana was broken during the battle against Muzan, meaning that she could be an easy target against the Neoshadows. As Tanjiro engaged the Neoshadows, he noticed that Kanao was without her katana. It had somehow gotten broken in the fight against Muzan. He couldn't help but feel worried for her, knowing that she would be at a disadvantage against the Neoshadows without a weapon.

Tanjiro came quickly and used his Water Breathing skills to defeat Neoshadows who were approaching Kanao and slowly turned to see her, Kanao's eyes widened in surprise and gratitude as Tanjiro suddenly appeared, fending off the Neoshadows that had been closing in on her. She watched with a mixture of relief and admiration as he effortlessly dispatched them using his Water Breathing skills.

Now against Muzan, he unleashed his whips against Caleb but he quickly swung his weapons, slashing every enemy whip away and he blinked to use the Invisi-Eye spell as he saw that Muzan has the 7 hearts and five brains inside his body.

"It's time to end this monstrosity…!" Caleb said with determination.

He ran quickly through Muzan's body before targeting Muzan's left shoulder while Caleb flashbacked briefly Tanjiro's Hinokami Kagura, then he performed the Dancing Fury which he repeatedly slashed nonstop at high speed like a ninja Muzan's left shoulder until destroying one brain causing profound bleeding on Muzan, Caleb cartwheeled across Muzan before focusing on Muzan's right shoulder and then performed Tornado Blue Sky which Caleb rotated his body quickly on Muzan's right shoulder destroying another brain, Muzan backed up in pain before using his right hand trying to grab Caleb who was able to find another brain in the right hand of the giant progenitor of the demons but Caleb then used Rapid Raging Sun as he performed a faster spin attack which end up destroying another brain within Muzan, then Caleb lunged towards Muzan's right ribs where he found one of Muzan's seven hearts before performing Scorching Bones Corkscrew Sun as Caleb twirled his own body like a drill and went through Muzan's right ribs destroying one of his hearts.

"Impossible…!" Muzan growled in disbelief as he tried to regenerate his vital organs but it didn't happen as he kept bleeding. "What's happening to me?"

"I warned you about not abusing your power because you were using your own vital force on the mark from your left palm." Tabuu's voice told Muzan.

"What…!?" Muzan exclaimed in disbelief and then felt burns on his body caused by the sun.

Now against the Neoshadows, Jupiter Ledger and Zenitsu combined Thunder Breathing Seventh Form: Flaming Thunder God, Rei who summoned watery blades in his hands was with Inosuke and they combined Beast Breathing Third Fang: Devour Rush the difference is that Rei used his watery blades while mimicking Inosuke's moves, Giyu with Assana combined Water Breathing Eleventh Form: Dead Calm Tidal Waves, Aria with her Keyblade was with Shinobu as they combined Insect Breathing Butterfly Dance: Caprice Illusory Light with the only difference being that Aria mimicked Shinobu's moves, Kyojuro and Aidan combined Flame Breathing Ninth Form: Rengoku while with Aidan was named Ninth Form: Adler, Aaron was with Uzui with both combining Sound Breathing Fifth Form: String Performance with the difference being Uzui using fireworks and Aaron using destructive light flashes, Alban was with Muichiro as they combined Mist Breathing Seventh Form: Obscuring Clouds Linger the only difference is that Muichiro manifested mist while Alban manifested a snowscape before constantly bombarding the Neoshadows with multiple slashes and ending with powerful and horizontal slashes, Cancer is with Mitsuri with both performing Love Breathing Fifth Form: Swaying Love Wildclaw-Beautiful with both using whip and energized long claws with pink energy with Mitsuri wrapping and Cancer dashing in circles hitting many Neoshadows and ended by landing with style, Skye with Sanemi combined Wind Breathing Ninth Form: Idaten Typhoon, Scorpio and Obanai combined Serpent Breathing Fifth Form: Slithering Serpent with the only difference is that Obanai manifested a snake while Scorpio manifested a scorpion, Ila with Kanae managed to perform Flower Breathing Final Form: Equinoctial Vermilion Eye with the only difference being that Ila used her Keyblade and without manifesting reddish eyes, however after ending Kanae had a blinded eye but luckily she drunk the elixir gifted by Keith to heal his damaged eye, and Terran with Gyomei combined their flails before attacking with Stone Breathing Fifth Form: Arcs of Justice and everyone else kept using their usual skills.

'Why Tabuu didn't tell me before!? It doesn't matter, I will kill them all!' Muzan said in his thoughts.

As Caleb was dodging the whips he was behind of Muzan's right side of his waist to perform Setting Sun Metamorphosis which performed a double reversal slash through said part of Muzan's body and destroyed another heart before he passed to the left side of Muzan's waist to perform Solar Inferno Haze which delivered a surprise attack which destroyed another heart within Muzan, he quickly ran towards Muzan's left ribs to perform Blessed Radiance by performing an x-slash to destroy another heart, he ran quickly behind towards Muzan's head and performed Dual Sunflower Thrust on Muzan's head destroying another brain, Caleb then used Sun Spiral Dragon Dance as he twirled around Muzan's whole body until arriving the left leg while managing to destroy another heart, followed by performing Supreme Flame Wheel through Muzan's right leg which destroyed another heart.

"I will destroy you!" Muzan roared as he lunged a spearhead made of flesh and bones similar from Hanzo's attack but then Caleb used Rainbow Illusion which was similar from the Fake Rainbow skill.

Then Caleb appeared from nowhere and performed a downward falling slash which went through Muzan's left hand and destroyed the last brain and damaged the point where Tabuu's gifted power was greatly damaged too.

"Just one heart remains…!" Caleb said firmly but tiredly.

"Impossible…!" Muzan snarled as Caleb landed.

Then Caleb performed Solar Flame Dance which he jumped while spinning with dual upward vertical slash as he tried to went through Muzan's chest but Caleb kept spinning faster and stronger until he managed to went through Muzan's chest which destroyed the last heart causing a big hole on Muzan's chest as he vomited blood again and Caleb landed perfectly.

*Ends*

Muzan glared at Caleb while the Digidestined of Destiny glared back at the Progenitor of the Demons, unaware for the King of the Cowards he has a tracking gravity device (like the one from Home Dreamworks' movie) with the image of ultraviolet grenades, then all the ultraviolet grenades came towards Muzan and Caleb pushed a button, then all the ultra violet grenades caused a big explosion of ultraviolet light forming a huge pillar, Muzan was caught there as he was roaring with his body disappearing and turning into ashes, finally defeating Muzan Kibutsuji once and for all, at the same time all the evil demons with Muzan's blood who were hiding into the shadows, all of them started to disappear into ashes, some of them roared before vanishing away while others closed their eyes knowing that they would find the peace in the afterlife, now with Caleb, he went back to his regular form and his weapons were separated, and Caleb collapsed to the ground really tired like everyone else.

With Muzan finally destroyed, the few but remaining Demon Slayers of Lower Rank and Kakushi cried with relief knowing that Muzan is finally gone, many of the members were so tired to cheer, others felt the victory empty because there were many deaths, others even mourned the deaths from those ones who died, and as for Tanjiro he collapsed from the previous injuries from Muzan's attack, he wasn't mutilated but he lost a lot of blood.

Man… He didn't seem like a multiverse level threat villain…" Aidan panted tiredly.

Then the Kakushis arrived to check Tanjiro.

"He's not breathing and he has no pulse…" One of the Kakushi said.

Giyu was shocked after hearing that, then he streamed tears before approaching Tanjiro.

"I failed to protect someone again…" Giyu sadly said as he collapsed on his knees and whispered sadly. "I'm the one always being protected by people, forgive me… I'm sorry, I'm so sorry…"

Just then Tanjiro's family arrived and to their shock and horror they saw Tanjiro dead, Kie covered her mouth in shock as tears were streaming from her eyes, Tanjuro stared sadly at Tanjiro, Nezuko was devastated, Takeo was fighting to hold back his tears not wanting to accept Tanjiro's death, Hanako was crying and hugging Nezuko, Shigeru collapsed in his while streaming tears and the poor Rokuta was crying heavily because he won't see Tanjiro anymore, the Aether Team members along with the Zodiac Warriors and Elemental 10 couldn't help but feel terribly bad for Tanjiro's family as they saw Tanjiro dead, but then Aries quickly recomposed himself.

"It's not over yet…!" Aries said.

Then everyone gasped as they turned to see the aries warrior.

"What do you mean…?" Aria asked.

"Knowing Muzan, cowardly as always, he will do anything to avoid death and therefore he will use his last cells to turn Tanjiro into a demon and he will attack us!" Aries explained.

"What are we gonna do…!?" Caleb asked before adding. "I don't have enough energy to fight again…!"

"All of us don't have enough energy…" Sara said with everyone knowing that she is right.

"Just remain one thing, share our chi, practiced by Taoism." Taurus said.

"What is Taoism?" Rei asked.

"It's a religion focused on geomancy and elements." Taurus explained before instructing. "Everyone gather around Tanjiro and share chi to save him, extend your palms pointing at Tanjiro to give their chi to him while I call for the gods of death in order to stop Muzan and finally give his well-deserved punishment."

All of them nodded, then Capricorn and Aaron casted a magic circle around Tanjiro's body, Taurus stabbed his sword and a spiritual energy surrounded Tanjiro.

"Please, gods of death, Hades, Anubis, Izanami, Mictlantecuhtli, Arawn and Hel, I need your help, protect Tanjiro, stop and punish Muzan for all his crimes against humanity during 1,000 years." Taurus prayed.

Then Tanjiro's family and the Hashiras gathered around Tanjiro Kamado.

*Voices of Support (PMD: Gates to Infinity)*

"We always traveled together, therefore I want you back, Tanjiro." Nezuko said.

"You always are there for us Tanjiro, now we will be there for you." Takeo said.

"We still remember the day you came to sell coal, we want you to come back." Hanako said.

"We're grateful to return back, now we want Tanjiro to return back." Shigeru said.

"Tanjiro, please come back with us, don't leave us." Rokuta said.

"We want you back, Tanjiro." Kie said.

"You fought bravely against Muzan and even used the Hinokami Kagura, keeping Yoriichi's legacy alive." Tanjuro said.

"You were my first true friend." Zenitsu said.

"You're the inspiration of everyone, you fought until the end, Tanjiro." Inosuke said, telling Tanjiro's right name.

"You helped to open up my heart, I thank you for that, and I love you, Tanjiro." Kanao said, declaring her feelings for Tanjiro.

"We started with the left foot, but we can still be friends after the events in the Swordsmith Village." Genya said.

"You encouraged me to train in the Hashira Training and reminded me of the words that Sabito entrusted to me." Giyu said.

"You avenged our deaths caused by the Hand Demon, now we will save you." Sabito said.

"And you helped us during the battle." Makomo added.

"Your kind heart reminds me of my sister." Shinobu said.

"You are brave and kind, I'm glad that Kanao met you and also declared her feelings for you." Kanae said.

"You set your heart ablaze the whole time during the battle, even during my absence." Kyojuro said.

"Thanks to you we regained hope in the Demon Slayers Corps after the defeat of the Sixth Upper Moon in the Red District from Japan." Tengen said.

"You helped me to remind my parents, rediscover the meaning of my name and recover my smile." Muichiro said.

"You're a great friend and you have a wonderful family." Mitsuri said.

"Thank you for saving Mitsuri twice, now I'll return the favor twice." Obanai said.

"Sometimes I envy you that you have a caring and kind father, therefore I'll help you after you helped my brother in the Swordsmith Village." Sanemi said.

"Your heart beats for all of us, Tanjiro." Gyomei said. "Namu Amida Butsu."

"You're the only one who keeps the last part of my brother alive." Michikatsu said.

"You are one of my best friends, and therefore we won't let you die." Caleb said.

Then the chi manifested in palms from everyone giving their chi to Tanjiro.

*Ends*

(Afterlife)
While Tanjiro was receiving support from everyone, Muzan was remembering his past, starting from the mother's womb.

'The shadow of death was always clinging tightly onto me, my heart had stopped several times inside my mother's belly.' Muzan said in his thoughts before remembering the day he was born. 'When I was born, I was pronounced dead. I had no pulse, and I was not even breathing.'

During Muzan's first day of life, his body was ummobile and unresponsive, then he was going to be burnt.

'When I was about to be cremated, I struggled, struggled and I cried.' Muzan said in his thoughts as he remembered when he was a baby and cried in an attempt to survive.

However, despite surviving, during all his years in human life, death chased him everywhere making Muzan to have thanatophobia and therefore he turned said fear into hatred towards humanity.

'I can say beyond a doubt that the wish I strongly yearned for came true. I made it reality, but my limit was that I could only do it with one body. Ubuyashiki, it pains me to say this, but what you said was right, all living creatures will meet death, without exception. Feelings are eternal and indestructible, that is indeed correct, I do not remember a single person I killed, once the flesh dies, it all ends, but then what?' Muzan said in his thoughts, admitting and realizing. 'Feelings are inherited and never destroyed, even I lost to this, the truth was right before my eyes and it made me shake with emotion, my flesh was mostly destroyed by that pillar of light, also I depended much from my gifted power and got weaker due the sunlight. However, my feelings are still indestructible, they are eternal, so I have to entrust all my emotions to this child.'

He decided to focus on Tanjiro.

'His heart and breath have stopped, but all his cells are not destroyed, they are alive, I can still make it, I will plump all my blood and power into you now, if you manage to escape swift death and stay alive. Tanjiro Kamado, you will conquer the light of the sun, you will become the strongest king among the demons, after all, you are the brother of Nezuko Kamado, you share the same blood, doing it with your revived relatives could end up killing them again, therefore Tanjiro is my only choice and he is the only one who can use the same breaths as that monster.' Muzan said in his thoughts as he was trying to approach Tanjiro. 'You will not die, I believe that you won't, make my dream come true, Tanjiro Kamado, you will destroy the Demon Slayers and all the otherworldly heroes in my stead and they won't see you as the hero, but as a monster.'

Even if he was destroyed physically however cowardly as always he will try to make Tanjiro the next King of the Demons in his insane goal of being immortal being in the mind of Tanjiro, but then Gods of Death interfered while protecting Tanjiro.

"You violate our will, Muzan Kibutsuji, you avoid death at any price, you killed a lot of innocent lives, you destroyed many families, you attempt to take the same lives that were restored by the Zodiac Warriors and Elemental 10, your punishment is clear." Hades, Anubis, Izanami, Mictlantecuhtli, Arawn and Hel said before firing lasers which hit Muzan however he was still unharmed before laughing evilly.

"It's an anemic effort from ineffectual deities, death has no dominion over me because today I will become the God of Everything, I will make disappear the whole legacy of Yoriichi forever, I will kill the Zodiac Warriors and Elemental 10 as punishment for committing the crime of reviving humans in my world, also I will kill their families, those heroes too, and all the humans in Japan, the world and whole Multiverse, therefore no one who will remember the ones who died, only demons will rule the Multiverse!" Muzan said as he prepared to fight again, with Tabuu's gifted power or not.

*The Core (Sonic Riders: Zero Gravity)*

However, Yoriichi as a spirit appeared and rapidly slashed Muzan's right arm which was regenerating slowly, said move caught him by surprise before glaring at the real "monster" who is allied with the Gods of Death.

"I'm glad to know that Tanjiro's family was revived by the Zodiac Warriors and Elemental 10, however my spirit cannot rest until you're erased from existence, you took everything away from me, now I'll do the same to you without regrets, Muzan Kibutsuji." Yoriichi said as he is facing Muzan who is glaring at Yoriichi and the Gods of Death, he angrily glared at them considering that they are on the wrong side of life for letting the Zodiac teens and Elemental children to revive humans that he or his demons killed, Muzan's expression changed and his anger rose.

"How DARE you interfere in my business!? How dare you let them revive humans in MY world!? Who do you think you are, Gods!?" Muzan shouted before glaring at Yoriichi. "You're not even alive anymore, so shut up, old man! And who do you think YOU are, to threaten me!? I will make you disappear from existence! Even those "gods", whatever they are supposed to be, can't stop me!"

Muzan engaged the Yoriichi and the gods of death in the afterlife, the fight of a god wannabe against a hero from the past and true gods, for Anubis (appearance from Gods of Egypt film) attacked by using his staff which hit Muzan repeatedly.

"You're just a coward who always tried to avoid death for 1,000 years and also killed innocent families and destroyed the lives of Demon Slayers whose lives are being restored for every human being revived." Anubis strictly told Muzan who glared at the jackal-like Egyptian God, even Muzan scoffed at his crime of killing innocent humans as a sign of never regret.

"What, did I hear that correct...? You call me ... a coward ...? Me, the King of Demons, the Ultimate being, is ... afraid ... of death? I am not afraid of death! I will never be afraid of death! And don't dare to compare me to those weaklings called Demon Slayers and Ultimate Multiverse Smash Bros Squad! They are just stupid humans and creatures with pathetic human qualities, nothing else!" Muzan yelled.

Then Arawn (wearing a skull mask with brown robe) interfered by using his scythe to perform dash and spinning slashes against the King of the Demons.

"So, you decided to become a demon to abandon your humanity. This is so selfish and beyond humanity even since the moment you were human before becoming a demon." Arawn strictly told him while the Gods of Death and Yoriichi are protecting Tanjiro's body which is Muzan's key to have a demon who conquers over the sun.

"I have only abandoned a weak body for a strong one! This is something every living being should desire, something every living being would do when they have the chance to become stronger! I have only done everything to become strong! Humanity is weak, this is why I gave it up. And demons are the perfect beings, which is why I became one!" Muzan angrily explained his twisted philosophy to the Gods of Death.

Then Mictlantecuhtli (having a golem-like appearance with an armor a human skull as face) attacked Muzan by using his sickles and macuahuitl.

"Also Tanjiro's family, like the people in Japan deserve a second chance to keep living, this is why we decided to allow the Zodiac Warriors and Elemental 10 to revive them." Mictlantecuhtli said, however, those words enraged Muzan because he could see that the Gods are on the wrong side of life, his anger grew to the limit.

"So... you, gods... are telling me that you think it is a good thing, to revive the people I killed... ? And... you think... that it is right to let them live… This... this can't be! Everyone I have killed... should stay dead... and stay dead forever! Their second chance is a mistake and should be fixed by me!" Muzan shouted.

Then Izanami attacked by launching will-o-wisp and Hades used his pyrokinesis hitting Muzan.

"Yoriichi is not the monster, you are." Izanami told him.

Muzan was absolutely pissed and his anger had reached its peak now.

"HOW DARE YOU TO SAY THIS!? I AM NOT A MONSTER! I am the one who is in the right! I am the one who does everything to become strong! I am the one who wants the perfect world! The world where only the strongest can survive!" Muzan yelled at the top of his lungs.

"My turn!" Yoriichi said before performing the twelve forms of the Sun Breathing and the thirteenth form being the last one.

And after that, Muzan was weakened and painfully backing up while still glaring at the Gods of Death.

"Your punishment is decided, for all your crimes against humanity in Japan and even turning against the Gods of Death which is another crime, you'll be sentenced to burn in hell forever and you will never be reborn." Hades declared and those words angered Muzan but also shocked him because he doesn't have forces to keep fighting and also the punishment of never reborn means never returning to the living world in another human body.

"This... this can't be... this cannot be true… I... I…" Muzan said as he was completely powerless now, but still refused to accept his punishment. "Who gave you the authority to judge me? Who gave you the authority to send me to hell? And more importantly, who gave you the authority to decide that I can't be reborn?!"

Then the Gods of Death launch their beams at Muzan who was screaming in agony because the pain, fury because his punishment is inevitable and hatred because Tanjiro, his whole family and the people revived by the Zodiac Warriors and Elemental 10 will keep living while Muzan will receive his max punishment, but mainly Muzan has hatred against Tanjiro and his family.

"NO... NO... NO! NOOOOOOOOOOOOOOOOOOOOOOOOOOOOO!" Muzan roared like a wild animal, screaming with pure fury and hatred. "I will never give up, you will never defeat me! You have no right to decide about my destiny! I refuse!"

Just after receiving the attacks Muzan disappeared completely as his last screams of rage were echoed.

*Ends*

(Hell)
After the battle, Muzan appeared in hell and feels an intense burning pain and then he realized that he was in the hell surrounded by multiple flames and his limbs are chained without being able to escape, however Muzan was only angry because all the humans that he killed are revived and kept living their human lives, but mainly Tanjiro and his family living it's his main source of hatred, the ones who are connected to Yoriichi. His limbs were still hurting from those beams that hit him and even though he was in a lot of pain, his rage was still the strongest emotion, his hate, his despise that the gods are allowing those humans to live.

"This... this can't be real… This can't be true… Those gods are in the wrong… They are the ones who are evil…" Muzan said, not wanting to accept his inevitable punishment.

His mind had come to the conclusion that he is not the one who deserves this, but the gods are the ones who made the mistake but then Muzan couldn't forget that Tanjiro will keep living with his revived family.

"That ba$tard… That son of a b¡tch… This is not fair… He will live a happy life with his parents and siblings revived while I get the worst possible punishment for every wrong thing I could ever do!? Damn it... this is absolutely wrong…!" Muzan said, now blaming Tanjiro and Yoriichi's bloodline.

(Taisho Period: Town)
After Muzan was sent to burn in hell forever for his crimes, Tanjiro awoke as a human and gasped as he woke up.

"Breathe slow and deep…" Caleb told him.

"What happened?" Tanjiro said.

"Tanjiro!" His siblings shouted before hugging him tearfully, hugging him tightly without suffocating him.

"You're back!" Nezuko tearfully said.

"Nezuko, Takeo, Hanako, Shigeru, Rokuta…" Tanjiro said, not holding his tears anymore as he hugged his siblings like there couldn't be tomorrow.

"Tanjiro, you're here…" Kie said sadly before hugging her eldest son and cried softly not wanting to let him go.

"We are together in this now…" Tanjuro said as he hugged his whole family.

Everyone couldn't help but watch the scene with tears, seeing such a heartwarming scene was overwhelming especially after everything in the intense battle.

"Just one more thing remains…" Primal Keith said. "Life Sanctuary…!"

He used his healing skill to heal all the heroes and then used his primal power to revive Tsutako, the big sister of Sumi, Kiyo and Naho, Kotoha Hashibira, the parents of Kanae and Shinobu and the children who lived in the temple of Gyomei, and after that Keith reverted to his regular form before collapsing but Kanae and Mallow quickly grabbed the Woods Elemental before he could hit the ground.

"The pillars owe all your help." Kanae told Keith.

"Now try to rest." Mallow told her boyfriend.

Even if the wounds and injuries disappeared, many of the heroes were still tired because they lost a lot of blood during the battle, Aria was staring in shock the previous massacre, all those corpses.

"Are you okay, Aria?" Shinobu asked her with concern.

"I… just… I think…" Aria tried to say the right words but she was in a mental and emotional breakdown as she cried uncontrollably but then Shinobu hugged Aria, understanding her mental state after everything they went through.

"Did we win?" Caleb asked.

"Yes, it is over. But only at the gravest of the costs." Lord Raiden said as he watched the corpses.

"You're right." Caleb said with depression as he remembered Muzan's words.

"You cannot save everyone at the same time." Muzan's words echoed through Caleb's head.

"So many are gone, their light has sunk into the earth, but for every victory sometimes there will be sacrifices." Lord Raiden said.

"We did what we had to. To protect the multiverse, losses in war… are inevitable…" Sonya Blade told the protector of Earthrealm.

"Come. Let us tend the fallen. Then we must help this world rebuild. Our work has only just begun." Lord Raiden said.

Then eventually the corpses have to receive proper burials and rebuild the damage caused in the town at the aftermath's battle. However, after the heroes left, two figures appeared, completely familiar and also archenemies of Ky, Kaos/Kaotic and Lord Zervik as a projection.

"The plan worked to perfection, Lord Zervik." Kaotic told him.

"Muzan Kibutsuji was blinded by rage and obsession for immortality, therefore he depended mostly on Tabuu's gifted power and led him to his ultimate destruction." Lord Zervik said.

"Yet the Prince of Light Virtus still lives." Kaotic said.

"No matter. Neither the heroes, nor Aether Team, Zodiac Warriors and Elemental 10 won't withstand us. Soon I will be able to rule the Divine Kingdom and Noble Palace, but we will be more careful than Muzan." Lord Zervik said.

Apparently peace has arrived in this world, but not all the peace can live forever, but the heroes will be ready after they recover physically and mentally for the upcoming events.

Muzan's finally dead and in hell ! But victory has a bitter taste, many heroes suffered to save the Multiverse and as you know every victory has a price to pay and soon that price will be payed in due time, especially towards Caleb, Aria and Tanjiro.