A/N: Hey guys it's Chaos and I'm back with an other fanfic, this story is a one-shot of one of my favorite scenes in Jujutsu Kaisen. The moment Toji appear inside the Domain and fought Dagon was insane. So it got me think what if instead of Dagon someone else came and that someone had something that could completely eradicate curse spirits, I did have to nerf Asta quite or else the fight would have literally lasted a second. Hope you all enjoy this fic and would love to read your comments.

I don't own Black clover
Apologies for any grammar mistakes

*BAM* *BAM* *BAM*

Came the loud sounds of metal hitting against flesh. The reason for this sound was due to the predicament 4 Jujutsu Sorcerer's were currently in. Maki Zenin, Naobito Zenin, Kento Nanami and Megumi Fushiguro were currently battling against the special grade disaster curse known as Dagon. A powerful curse spirit born from humanities fear of water based disaster's. The 5 were currently in Dagon's domain expansion, which looked no different than a tropical island. Despite Megumin's earlier intervention of forcibly weakening the domain and handing Maki the Special grade cursed tool, his support barely made a difference to turn the tides around for the battle they were in.

"HAAAII!" Maki gave a battle cry as she swung her 3 sectioned staff towards Dagon, the cursed spirit blocked the strike with his arm with Naobito using this opportunity to get behind him and land a kick on Dagon's face, even after losing an arm Naobito wasn't gonna take it sitting down until the curse spirit was exorcised.

"Pointless" Dagon simply mutters as 2 large piranha fish sprouted from his side to attack the Zenin sorcerer's, sending them back to create some distance for himself. Dagon then shot out several more piranha fish towards Megumin, but luckily Nanami came in and quickly disposed of the attacks.

Maki and Naobito then quickly came and began trading blows with the special grade curse leaving some damage on its body but it was barely noticeable.

'If this keeps up, we might be able to beat him. That is if we are able to continue, I can tell Fushiguro is at his limit,' Nanami thought to himself as he remained focused for any other oncoming attacks. Maki and Naobito continue trading blows with Dagon as Nanami blocked all the projectiles that were coming at him from the special grade curse.

"Nanami, I'm creating an exit so we can escape!" Megumi told the Grade 1 Sorcerer. "The hole is below me, the octopus isn't as strong as Gojo sensei so he shouldn't be able to create another domain after we escape"

Understanding the situation Nanami yelled for the 2 Zenin sorcerer's to assemble towards Megumin as both of them followed suit and began rushing towards Shikigami user.

'Protecting the boy?, wouldn't it be easier to-' Dagon realised what they were doing and ran after the sorcerer's to finish them off. The Zenin sorcerer's were right almost there and would have been able to jump through the hole, but something was off about the hole that Megumin didn't pay attention to due to trying to remain the hole open.

Instead of the hole showing the train station it look more like a portal that didn't have a clear image, not only that but a noise that sounded like yelling was coming from the hole. This made all Sorcerer's confused and perplexed as what was that noise as it got loud, but before any of them could enter the portal something came launching out of the portal.

"AAAAAAAAAAHHHHHHHH" the thing that came out of the portal launched into the sky screaming, making everyone stop everyone in their tracks at the sudden development of the battle.

Upon closer inspection the thing that came out of the portal was a person. The most noticeable features about the person was he was male, wearing black and had spiky ash blond hair held with a black headband.

"W-WOAH WOAH WOOOOAAAAH!" The stranger yelled out, flailing his arms in the air for a bit but then did a front flip and on his feet on the sea-shear, splashing water around him.

'Who the hell is that!' Everyone in the domain thought to themselves in complete surprise at the sudden arrival. Now getting a better look at the person he looked around 16-17 years old, was pretty muscular with his chest and abs exposed and was quite short for his age at around 5 feet 3 inches. Though the strangest thing was that when the boy arrived there was a tattered book floating beside him with an ominous red glow.

The young man stood up straight and quickly looked around his vicinity to see where he was.

"Wha?, where the hell am I?" The stranger asked out loud until he noticed he wasn't the only one in the domain. He looked to the 4 sorcerer's and the curse spirit with a confused look on his face trying to make sense of the situation.

"Do any of you know who that is?" Maki asked her companions on guard from the sudden arrival

"No, I've never seen that person in my life" Nanami responded to Maki question with Naobito nodding the same thing.

'Still though…something about this person doesn't seem right, I don't sense any curse energy from him and what's with the floating book. Shit there we don't have time to focus on that'

"Damn, the holes closed I don't think I'll be able to create another one" Megumin voiced out his predicament making Nanami click his tongue as they may have to not only fight the special grade spirit but also protect or fight the sudden arrival.

"Hey are you guys alrig-!" The ashen haired boy couldn't finish his sentence as he sensed an attack coming toward him and Megumin, so he quickly pulled out an abnormally large broadsword and quickly cut away the man eating piranhas so fast everyone in the domain could barely comprehend it.

'He's fast, I don't sense any curse energy in him…is that just his physical strength?" Maki thought to herself in complete bewilderment from witnessing the stranger's speed.

'Just who the hell is this guy' Megumin thought to himself as Naobito looked at the ashen haired teen with both a mixture of seriousness and reminisce on his face.

The ashen haired teen then turned to the cursed spirit with his sword in hand having a somewhat understanding of the situation.

'This thing is it a devil…no, It feels very similar but there's some difference in it. Hell the Ki and energy I'm feeling from these guys feels like this thing in front of me, except I don't sense any malice from them. The octopus face however is radiating nothing but malice and evil intentions. Their Ki almost feels like they are using negative mana.

"Tch, just another piece of trash" Dagon scoffed as he sent 2 monstrous sharks towards the ashen haired teen. The boy narrowed his eyes and dashed forward to slice the 2 sharks in half without breaking a sweat. He then ran towards Dagon so fast the cursed spirit barely had time to react as he lifted up both his arms to block a slash. Dagon thought he could tank the slash but was completely surprised when the broadsword cut straight through his arms like butter. The cursed spirit now had an opening to which the ashen haired boy used to kick Dagon in the stomach, sending him flying.

*BAM* *CRASH* *BAM* *CRUNCH* *BAM* *SPLASH*

Came the sounds of Dagon crashing against the trees suffering more until he landed on the water surrounding the island. Everyone who witnessed this had their eyes widened in shock from how easily the stranger had just handled the special grade curse spirit.

'He sent him back with just 2 blows' Megumi thought in bewilderment at the strength the stranger just displayed. Despite him fighting Dagon all the sorcerer's were thinking the same thing, 'who was this guy and is he a friend or foe?'

"You guys need some help with that creature!?" The teenager asked the 4 sorcerers. When the stranger asked, they all looked at each other contemplating what to say. It seemed like the boy was a capable fighter and if he was an enemy he would have attacked them already. They all agreed for the assistance but needed to know something first

"Yes we'd like your assistance, but who exactly are you?" Nanami asked the ashen haired teenager. The stranger gave a reassuring grin to the group.

"The names Asta and I'm a Magic Knight" Asta responded, still on guard to prepare for any attack from that creature he sent flying.

"A what?" Naobito asked incredulously this left the group with more questions than answer but they would have to wait as Dagon came back fully enraged from the sudden attack, though his arms haven't regenerated yet.

"HAAAAAAAAAHHHH DON'T UNDERESTIMATE ME!" Dagon yelled in fury summoning 2 very large lobster shikigami to attack the stranger now known as Asta. Asta didn't look fazed by this but swiftly dodged the claw strikes from the shikigami. The exchange barely lasted 7 seconds as Asta got close to the Shikigami and slashed his sword horizontally, cutting the both of them in half in just one shot.

'Just what is this brat, he has no curse energy in him. Not only that his sword as well, it's stopping my regeneration and most of my curse energy has been depleted… its like he's completely nullifying curs-, that's it!' Dagon now released what the boy was capable of and how dangerous he was to not just him but the other disaster curses as well. He had to buy time so Megumin would reach his limit therefore allowing him to fully control the domain.

Dagon jumped into the air and sent several sharks, carbs and piranha shikigami towards the weakened sorcerers to draw Asta's attention to protecting them. Unfortunately for Dagon, Naobito and Maki were still capable of fighting and swatted away most of the shikigami. Asta then launched towards the cursed spirit with his sword in hand. Dagon was not able to dodge much less block or react as Asta pierced the sword right through his chest.

"*cough* *cough*" Dagon coughed out purple blood as Asta sliced down the special grade spirit, completely killing him and making the domain disappear in an instant. As Dagon's piece's were evaporated into nothing Asta looked around completely alarmed at what had happened to the island they were on.

"What the? Where are we? What is this place? What happened to the island?!" Asta asked to non one in particular

"Relax, we're out of the domain, we're currently in the train station?" Nanami answered the teenager, still on guard as the rest to see if they could trust him.

"Train station?" Asta asked with a confused look on his face. "I'm sorry, what's a train station?" The sorcerers didn't know if the boy was messing with them or not and were perplexed on how to handle the situation. After all, they still need to get Gojo unsealed.

"You also said domain, was it that creature's magic?"

"It's not really magic but it was a cursed energy technique" Megumin answered with everyone looking at him wondering if he knows what he is doing. "You see we are sorcerer's that use something called Curse energy to perform various supernatural techniques to exorcise creatures like the one you fought. The creatures are called curses, spirits born from human negative emotions" Megumin explained to the shorter ashen haired boy, somewhat understanding the situation.

"Oh that makes sense, so they're kinda like devils which are born from negative mana" Asta said out loud with the rest looking at him confused. Just what exactly did he mean by mana and devils.

Asta would explain the last thing he remembered was that he got back from a mission and how a portal suddenly opened up in front of him and then he landed here. They would exchange more information with each other and would learn that Asta didn't come from Japan, hell he wasn't even from this world. He came from a place called the Clover kingdom where there are such things as magic, mages, elves and devils.

"Kekekeke, well this is an interesting development and here I thought I had already seen it all only to then be surprised that there are other worlds, truly an interesting day indeed" Naobito cackled out with the rest ignoring him and just looking at Asta in interest.

'A magic knight huh' Maki thought to herself in interest

'Who knew multiverse theory exists and to discover it at a time like this, luckily it didn't bring out something dangerous. This guy is strong, hell I don't think he was even going all out when he fought that special grade' Nanami thought to himself fascinated

"So by any chance would you guys happen to know a way for me to get home?" Asta asked the 4 sorcerers with them shaking their heads much to the ashen teens dismay.

"...I see…well I'm pretty certain everyone back home are gonna have a method to find me, until then I can wait and possibly look around for a solution" Asta said trying to look at the bright side. This allowed Megumi to have an idea

"Hey Asta, if you're willing, could you help us in our mission?" Megumin asked Asta, with the teen turning to the raven haired boy, listening to what he had to say. They explained to Asta that theri strongest sorcerer was sealed and they have to deal with the various curses running amuck in the city. Asta gladly agreed to help before they could move Asta's Ki sensed something coming towards them.

*BAM*

Asta blocked a punch from behind him with his sword. The strike came from a tall man with black hair, this man was known as Toji Zenin A.K.A the Sorcerer killer . Asta pushed the man back but the man didn't stop his attacks and tried to hit Asta but the magic knight continued dodging all his strikes. This man was definitely stronger than the curse spirit but it wasn't something Asta couldn't handle. The other sorcerer's were surprised at another sudden interruption especially Naobito and were about to intervene until they sensed another curse arrive this one far stronger than Tojo and Dagon.

The Curse was shorter than Asta was wearing yellow, had one eye and a volcano as a head. This curse was known as Jogo. Jogo walked to the now evaporated Dagon with a pissed off expression on his face as fire was coming out of his hand.

"Leave the rest to me Dagon" Jogo said as he quickly moved to Nanami first, intent on killing him. Asta wouldn't let this happen so he kick Toji back and brought out his demon dweller sword, sending an Anti-magic slash towards the special grade curse. Jogo narrowly dodged the attack although his leg wasn't so lucky as it was now severed from his leg.

"Tch, you damn humans!" Jogo yelled in rage as he spawned 3 volcanoes around the environment to vaporise everyone in the vicinity. Everyone except Asta and Toji were having a hard time dodging due to the fact they had just been weakened from the previous battle.

"Why don't you just chill out hot-head!" Asta yelled out as he was now fighting Toji and Jogo simultaneously. He wanted to end this battle fast so he first dealt with Toji. When Toji got close to punch him with a right Asta dodged the punch and countered by slamming the flat side of the demon dweller blade to Toji's face sending the flying out the window knocking him out.

"None of you are getting away" Jogo voiced out as he shot out fireballs from his hands towards the sorcerer's. Megumi used rabbit escape to summon a village of rabbit shikigami to block Jogo's view and make a retreat with the rest. Unfortunately most of the rabbits were incinerated into ash almost instantly as Jogo released fire and lava from his head and ears, but because of that split second of his view blocked and the fact that Asta had no curse energy so Jogo couldn't sense Asta behind him.

*Slice*

Jogo's head was sliced clean off with Asta using his Demon dweller sword as the cursed spirits head rolled to the side as it began to evaporate.

"I-I-Impossible…no" Jogo weakly said as his head and body were now evaporated into nothing as Jogo was now dead.

"Dang that curse needed to chill off, Oi are you guys good?!" Asta asked his new companions

"*pant* *pant* *pant* yeah…*pant* no major injuries were received" Megumi said, exhausted between breaths.

"*pant* *pant* we were able to avoid a troublesome scenario thanks to you, not to mention 2 special grade curses have been taken out of the equation"

"Hmm, give me an extra minute and I would have dealt with that curse" Naobito said with a shrug as Maki rolled her eyes at the old man's remark. Maki then looked down at Jogo's now evaporated body and noticed something on the floor. She went to pick it up with caution and hand her eyes widened at what she just found.

"Guys look what I found" Maki said as she held out a bag that had 10 of Sukuna's fingers. Asta had both a confused and grossed out look on his face but the sorcerer's were all surprised at the sudden turn of events.

"This is…This is good" Nanami said looking at the situation as a whole, 2 special grades were defeated and they had been able to acquire 10 of Sukuna's fingers could their scenario get any better.

"I don't get what's so special about those fingers" Asta said, still confused on why everyone was making a big deal about a bunch of fingers.

"Well boy to put it simply, those right there are fingers belonging to the most infamous sorcerer throughout history, Ryomen Sukuna. Each of those fingers contain a part of his soul, when consumed by a curse the curse becomes exponentially stronger and when consumed by a human there's a 1% chance of them being possessed by Sukuna himself." Naobito explained

"Ok then let's destroy them the-"

"You can't" Nanami would interrupt the shorter male "Our strongest sorcerer Gojo isn't able destroy these cursed artefacts, which is why we have to seal them away so no one can reach them" Nanami would explain leaving out the part of Yuji consuming all fingers and eventually having to be killed for it.

Asta thought about it for a second until had an idea.

"So these fingers have 'Curse energy' in them and this person named Sukuna has his soul attached to them right?"

"That's the gist of it yeah" Megumi responded to the ashen haired teen wondering what Asta planned on doing. Asta's grimoire flipped its pages and out came one of Asta's most powerful swords. The Demon Destroyer sword, upon Asta bringing the sword out the sorcerers could feel the ominous energy radiating from the blade.

"Hey Maki-san, can you lay down the fingers on the ground, I wanna try something real quick?" Asta asked the green haired girl. Everyone looked sceptical at what Asta wanted to do but eventually decided to let him proceed. Maki laid out the fingers and Asta exuded more anti-magic from the sword, bringing the blade closer to the fingers. As soon the blade got close Anti-magic began consuming the fingers for a couple of seconds until Asta stopped. The moment the anti magic was released it looked like nothing had changed, until.

*CRACK*

"!" Everyone now had their full attention on the fingers as they couldn't believe their eyes.

*CRACK* *CRACK* *CRACK* *CRACK*

All the fingers started cracking, breaking into smaller and smaller pieces until they broke into dust, completely destroying what was once the King of curses fingers. The jujutsu sorcerers were in complete awe at what just happened. They almost thought they were in a dream due to how easily Asta had just done something not even their strongest sorcerer could do.

"Unbelievable" Maki was simple voice out

"I'll say…not even Gojo sensei could destroy them"

"Sooooo….now what?" Asta asked the remaining sorcerers. There were gonna be questions for Asta later but for now they continued their mission of unsealing Gojo. Along the way they were able to reunite with Yuji and made quick work of Mahito. Every sorcerer was gathered together ready to face off against Kenjaku, but due to the unexpected wrench in Kenjaku's plans you could imagine it didn't go to well for one of Jujutsu's most evil sorcerer.

Despite the surprise of being sent to another world Asta had liked being around these for the short moment he had with them. Maybe if things were different he could have been in this world as help fight off curses, but that would be a story for another day as this is the story of how an unexpected arrival help stop a great tragedy in Shibuya

A/N: And that's a wrap hope you all enjoyed and hope to make more Black clover crossover stories in the future