Spoilers from included and/or represented works abound. Please read this fiction carefully.
While the Sentais and the Rangers was busy fighting, David stole both crystal from Drakkon and Rigna, using Sandevistan to quick stealth it.
"Crystal get!" The announced twice.
"Hirume! Let's escape!" David then unlocks the cage.
The tape is removed and the ropes are untied, Hirume and Yomi are free.
"Thank you!" Hirume thanked David.
"We have to take both crystals and escape!" David told both girls.
"I'll do." Yomi takes the Square Enix crystal.
"Holds that!" Hirume takes the Super Hero Time crystal.
David then tapped the phone, creating a portal. The three then went in, without Rigna or Lord Drakkon noticing.
By the time the Sentais and the Rangers left, Rigna noticed that both crystals were stolen, while Lord Drakkon noticed Bahamut is charging up. Combined those problems, both ended up fighting each other, allowing Bahamut to take time and perform Xenoflare. This, and the blast that ensued destroyed that Earth, broken the rift there, killed Lord Drakkon and severely injured Rigna.
"Damn... you!" Rigna floating in space, on top of the debris left.
Later, at Shinra HQ...
sniffs* "This is all our fault-" Nia the Blade cried.
"It's not your fault..." Xiaomu responded. "Don't blame yourself..."
"By blackmailing the Power Rangers and the Super Sentai..." Melia Antiqua continued. "Their worlds is in danger."
"Wait... Lucy is involved in this too?" Reiji asked.
"Yeah." Melia Antiqua confirmed. "She destroyed the false Queens, the robot clones of our future selves."
"Show yourself!" Meden shouted.
"Who?" Reiji and Xiaomu asked.
Meden then pointed at Xehanort, but not that himself anyways. Xehanort is infected by Sigma Virus, as shown with his glowing purple eyes, metallic accents and some circuit-like lines across.
laugh* "It's only for you to find out..." Xehanort?
"More like... Xenohanort!?" Reiji found out.
"With Sigma the power, I can't break Kingdom Hearts!" Xenohanort declared.
"But the Kingdom Hearts has already been destroyed nearly a week ago!" Due responded.
"Exactly! The ruins will be repurposed against the likes of you!" Xenohanort then laughed evilly.
"He's even worse than before we convinced him to let go of x-blade..." Sora realized. "He's far worse than he has ever been before."
"Sora, I'm gonna kill you!" Xenohanort then pointed the x-blade at Sora.
"Damn it!" Meden is angry. "You dare interfere with us!?"
"And there's the annoying Oros Phlox!" Xenohanort makes fun of the Oros Phlox.
"Roxas, come here!" Sora called Roxas.
"If this is the reason why I'm here now, then..." Roxas summons both Oathkeeper and Oblivion.
"Go ahead, let's buddy this Infected Keyblade Master." Sora turns to Final Form and summons Ultima Keyblade.
Reiji, Xiaomu, Saya, Kogoro, Mii, Due, Meden, Sora and Roxas went to combat Xenohanort. They went on to combos and skills the infected Keyblade Master who now tries to kill them all. In the meantime, Melia Antiqua and Nia the Blade buffed those allies and then ran away with the files.
Meanwhile, in the world of Zi-O...
Showa Riders, Akibarangers, Go-Riders, Ginga, Shinobi (Rentaro Kagura), Hattari (Isamichi Konjo), Quiz (Mondo Douan), Kikai (Rento Makina), New Den-O (Kotaro Nogami), future Kiva (Masao Kurenai), future Ghost (Ayumu Tenkuji), Century (Ryunosuke and Hideo Momose), future Garren and Leangle (from year 2305), and Drive Type Next (Eiji Tomari) were summoned.
"Father, I'm back!" Future Drive called his father.
"I'll help you, Dad. Let's get it!" Future Ghost called his father as well.
"That's convenient." Ghost is pleasantly surprised. "Go son, let's destroy those Another Riders!"
"Why summon us all the way here?" The new Garren is confused.
"Who're you!?" Shinobi is shocked at Revi and Vice.
"Revice from 2021." Ohma Zi-O notified Shinobi. "The succeeding one, Geats, is from year 2022." *referring to Kamen Rider Geats (Ace Ukiyo)*
"What the!? We're from 2022, so we..." Shinobi and Hattari is shocked.
"Calm down!" Geiz told Shinobi and Hattari.
"Space kitta!!!!!" Fourze shouted, annoying the others.
Geats emerged from the rift, just before it closed. He walked through the other Riders (who ends up giving way), before stopping at Ohma Zi-O and Shinobi.
"Nice to meet you. And uh," Revi greeted Geats and... "welcome back, Century!"
"Sure!" Century responded.
"Wait a second..." Infinity Ultron is confused. "Star of the Stars of the Stars!?"
"Now then... It's time for the highlight." Geats announced.
All Riders, all Sentais and all Rangers ran into combat, and the Another Riders went rampage.
Meanwhile...
"Sora, no!!!" Reiji cried at Sora is about to get killed.
"Die, little kid!" Xenohanort is about to stab Sora.
However, Smasher intervened with Sandevistan. This knocked Xenohanort and the x-blade out.
"Adam Smasher!" Saya called Smasher. "You came here just in time!"
"Thanks..." Sora then passed out.
"Someone call an ambulance!" Due told everyone.
Smasher then picks up the x-blade.
"Confusing design." Smasher examined the x-blade. "But interesting for a fleshy shit to handle."
"How could you..." Xenohanort then stood up and charged towards Smasher.
But the latter simply knocks him out and away.
"Flesh minds thinks the wrong." Smasher said.
"We need the Soul Stone!" Xiaomu told everyone, while Katana and Akatana carried Sora.
"But the only fully compatible Infinity Stones are the ones of the same set!" Roxas replied.
"However, their powers could be transcended and appliable if we can activate the two sets of the same stone!" Xiaomu has an idea.
"Two of the same stone activated will allow their respective power to be applicable to more than one universe." Reiji figured it out. "Three of the same stone would extends that to affect anything in the Multiverse, and such!"
"That's it!" Reiji has an idea. "We need an complete Infinity Gauntlet and two Soul Stones!"
"Thanks, I'm holding some." Turns out, Meden is wearing a completed Infinity Gauntlet and is holding two Soul Stones. "I got it by winning that auction battle."
"Good." Saya knows it. "Now throw two Soul Stones into Xehanort's mouth."
"I'm holding him!" Smasher is now holding Xenohanort.
"Fuck you! Fuck you!" Xenohanort shouted.
Reiji then catches the two Soul Stones and quickly duped it into Xenohanort's mouth. Xiaomu even taped the mouth afterwards just to make sure. This forced Xenohanort into swallowing both Stones, and only then would Xiaomu would remove the tape.
"Damn it! I've been played-" Xenohanort is enraged.
"Shut up, you meat with wrong chrome!" Smasher then gave Xenohanort a spanking.
"Return to yourself." Meden then snap the finger.
This activated both Soul Stones, and both reacted harmonically. This cured the Sigma Virus, and Xehanort returned to normal. Smasher then anti-choked him, making Xehanort spitting the Soul Stones.
"Ugh... What happened?" Xehanort is fuzzy.
"Thanks goodness!" Due is relieved.
"Ultron-Sigma did it again." Smasher guessed it.
David, Hirume and Yomi appeared, meaning the latter two escaped. They also possessed the two crystals: Super Hero Time and Square Enix.
"Yes! Two crystal acquired!" Reiji is fun.
"Yay!" Xiaomu is excited.
"Good job, kiddos." Saya congratulated Hirume and Yomi. "Welcome back."
"These two were arrested and have been subjected to captive as the enemies blackmailed the Rangers." David reported. "I freed those girls and got the crystals."
Hirume then explained what happened ever since she and Yomi became under arrest (in their perspective, ofc).
"Speaking of which, do you know about the livestream?" David asked Hirume.
"Yes. Me and Yomi watched it." Hirume confirmed.
"Ugh... Great! So you watched the very destruction of Zero Point!" Reiji realized.
"We found a few survivors." Kogoro showed that there are survivors. "These are the Seven. You'll meet them soon."
"Oh really?" Hirume is excited.
"I know the so-called Empress Zero's real name." Yomi said.
"What?" David has no idea why.
"I can strike the darkness with my moonlight, and the way I do it makes it possible to know the inner minds in the process." Yomi explained.
"Save this for later." Reiji stopped.
Meanwhile, in world of Zi-O, Another Riders is being destroyed by everyone. Despite possessing the powers to do so, the heroes are being bombarded by the regeneration of the Another Riders, at least in the long run.
"Most of these kept regenerating!" Zero-Two commented. "Even after applying the correct powers and more to each and every single Another Riders, hardly any of them was wiped out!"
"Kamen Rider, Super Sentai, and Power Rangers!" Infinity Ultron called out the heroes. "You're getting out of your existence!"
"Look!" Kiramai Red (Juru Atsuta) noticed the sky is coming with stars. "Throw Kaenken Rekka up in the sky!"
"Oh well... This is for Super Hero Time!" Saber then threw Kaenken Rekka up.
"No, you don't!" Infinity Ultron tried to hold the Rekka down telekinetically.
But Ohma Zi-O summoned Grand Zi-O, distracting Infinity Ultron by having hit by the Grand Zi-O itself. Shortly thereafter, Grand Zi-O disappeared and the Rekka still going up.
"Don't you dare!" Ultron-Sigma D saw it all and then flew to the Rekka. However, he's held down by Wizard.
Nekron saw it as well, but is kicked by Zero-One's Realizing Impact and Zero-Two's Big Bang.
"This sword goes too high!" Dark Kahn and Archon then flew up to reach the Rekka.
"You're not allowed! Miracle Star, go!" ShishiRed (Lucky) as Orion then uses Saiko Kyutama and goes Super Shishi Galaxy, bombarding Dark Kahn and Archon all at once, making them fall down.
Rekka successfully stabbed into the rift and absorbed the lights in the dark sky, forming and engaging the Sefiroth tree, manifesting partially from the rift the 10 Seikens, so: starting with Kaenken Rekka itself; Suiseiken Nagare; Raimeiken Ikazuchi, which now became Gekkou Raimeiken Ikazuchi; Dogouken Gekido; Fuusouken Hayate; Onjuuken Suzune; Ankokuken Kurayami; Mumeiken Kyomu; Kougouken Saikou; Eneiken Noroshi; and Jikokuken Kaiji. Wonder Almighty Wonder Ride Book os immediately summoned as well, and absorbed all 11 Seikens altogether, morphing into a turbocharged, empowered Haouken Xross Saber. It then fell down from the sky, and shone so bright it blinded the Another Riders and even Infinity Ultron.
"How could this be!?" Infinity Ultron is shocked.
The Almighty Seiken then fell down like a meteor, but towards Saber. He then ended up holding it triumphantly, and things gets so bright, it's briefly like between a day and a night. Then, it turned back to be aesthetically identical to the Haouken Xross Saber previously wielded by Saber.
"Yes!" The Kiramagers is happy.
Cross-trivia: TheHaouken Xross Saberis thetransformation deviceandSeikenofKamen Rider Xross Saber. It is formed by uniting all of theSeiken. The Xross Saber is also referred to as theUltimate Seiken.
"I can't believe I get to take the story to the next level with this!" Saber is surprised. "Time to write everything for our sake!"
Saber positionally resetted the Super Hero Senki Wonder Ride Book and inserted the enhanced Haouken into his Seiken Swordriver.
"Damn you! We would like to kill you, but you just attained insane power!" Ultron-Sigma D is enraged. "You dare to defy us!"
"It's not just Ultimate Seiken anymore!" Zenkaiser announced "It's the Almighty Seiken now!"
"Henshin!" Saber transforms.
"No!!!!!" Infinity Ultron and friends cried at Saber transforming.
The combined enhancement for Xross Saber and the powers of the Super Hero Time provided by the Wonder Ride Book gave Saber powers like no other before. And...
"Rejoice! Ten intersecting swords meet half a century of heroes...! The author of justice and courage!" AkaRed and Woz rejoiced. "Almighty Xross Saber! Super Hero Time with the miracle of shining stars! Noble power of justice, flame of courage!"
What's shown there is Saber Super Hero Senki but with starry coloring of Xross Saber, and the armor made with the Mashin crystals instead.
"Yes, for the superheroic justice!" Ohma Zi-O saluted.
"The Swordman of Galaxy!" Saber roll-called. "Kamen Rider Xross Saber!"
"Damn you!!!" Asmodeus turns into his final form: a giant, menacing four-winged dragon.
"You tried to manipulate Shotaro Ishinomori. Then you went on to do bidding for the Dark World" Saber reminded Asmodeus. "And now you want to kill us all!?"
Saber leaped, set up the attack, then did a slash on Asmodeus. This became enlarged and easily impaired, crippled and busted Asmodeus. Then Ohma Zi-O and all other Heisei Riders right there, and Century all Rider Kicked Asmodeus, destroying him.
"No more Another!" Saber then summoned copies of Riders' swords respective to each and every Another Riders. Then those falls down, stabbing and truly destroying the Another Riders at the same time.
"Wow!" The Power Rangers is amazed. "He did it immediately!"
"The first time, you needed all the powered kick and Megazords to defeat them." Infinity Ultron is shocked. "Now... all you needed is an Almighty slash and not-so-all the Rider Kicks?"
Infinity Ultron then fired a full-on beam. But Saber blocked it with the Haouken without problem. Saber then flew so fast.
"How dare you!" Ultron-Sigma D went to block the way, but Saber summoned thousands of copies of Sentais cannons. All shoots the threats continuously.
"Argh!" Archon cried as friends got hit. Made even more dramatic as the Sentais and the Rangers cheered.
"Do it! Mr. Author, do it!" Green Ranger is excited.
Saber does finisher combos with the Haouken, and Infinity Ultron got decapitated in the process.
"No!!!" Nekron disappeared.
"Impossible!" Archon then got stabbed by the copies of the normal Haouken which Saber just summoned.
More Seikens then stabbed Ultron-Sigma D, exploding him into pieces of their physical forms, killing him and then them all. The explosion is bright enough to briefly blind everyone else.
"Ugh!" Infinity Ultron then reconnects.
"I'm gonna banish this monster to the Shadow Realms." Saber then teleports Archon away.
Archon ended up being sent to the time of his original destruction and death, with Gogetama, fused from Goku, Vegeta and Saitama, successfully throwing that Spirit Ball.
"It's over for me..." Archon disintegrated from the blast.
"Fuck you all!" Infinity Ultron then hastily activated the Infinity Stones just to kill everyone there.