Spoilers from included and/or represented works abound. Please read this fiction carefully.
Noah, Loid and Gabimaru are examining a mysterious sword.
"Well, the curvature is a bit different, so that's not entirely unexpected." Gabimaru concurred.
"You're right." Loid concurred.
"Mister Forger, feels like it's burning in the inside." Noah noticed.
"I have SHIFTed through to see who dropped this sword, but no result." Phi reported.
"The blunt edge looks kinda familiar to Queen Nia..." Noah realized.
"You mean that looks like Pyra's Aegis?" Phi asked in response.
"Most likely." Noah concurred.
"Oh, you said that the blunt edge looks similar to Pyra's?" Elma, in her human form, heard that.
"Miss Elma, this sword isn't the same as any sword known to date." Loid showed up the sword. "It's like a katana but feel ridiculous."
"Is there Hi-no-Kagutsuchi there?" Elma asked.
"What are you asking, Miss?" Phi responded in fear.
"Look. I can feel the so-called Malevolent Entity." Elma pointed out.
Meanwhile, the Cube Queen, Chloe Love, Kai Iod, the "tortured" Princess, the legendary sword EX, Chrome, the fifth generation experimental Gear, and that Slime, all watching over Prometheus.
"Sir Chrome, the knights have discussed about a mechanical construction piloted by a god." EX told Chrome about Deus type-Machina. *explains the details*
"A giant machine by a god. I have determined that it's insane." Chrome commented. "Another threat by the same god who broke reality all over."
"You see, it's like the Team Mecha Leader strapped with the divine Throne." Kai commented. "Alright, what do her highness say?"
"Kai, she's just eating some snacks." Chloe replied. "She may be a majestic swordman, but she has been subjected to a load of loads of... enjoyments as the 'tortures'."
The Princess is really enjoying the snacks.
"Yeah, right..." Kai concurred. "Haha, isn't that funny, master, idol!"
"But this chrome-armored spirit man..." Chloe liked at Prometheus. "We barely got into contact with him."
"An insane unit coming from another worlds." Chrome noted.
"Not to mention the Infinity Stones..." EX commented. "And so much more."
"A Keyman..." The Cube Queen looked at Prometheus. "A man who tagged against artists' flaws..."
"Your Cubed Majesty, the Twilight girl is coming." EX notified the Cube Queen.
"Miss, I have the basic coordinates of the Fatui!" Marie reported.
"Margueritte, show me where." The Cube Queen apprehend.
"Near Prometheus' lair." Marie replied.
"So... that's the place." The Princess stood up.
"Being spirit medium, I will take you." Chloe then transformed into the Ghost Girl, with Kai becoming the scythe.
"Hostage located." Chrome scanned the report. "Proceed to Prometheus' lair."
However, Prometheus is regaining consciousness, waking up without left eye.
"Uhhh... Where am I?" Prometheus is fuzzy.
"Huh?" The Cube Queen heard it. "He is waking up?"
"Oh, I see." Prometheus noticed. "Watching over me?"
"What?" Marie is confused.
"That ridiculous drug..." Prometheus remembered. "Who injected it!?"
"So you have woken up, Keyman." EX told Prometheus. "What do you want from us, the knights?"
"So you must've been keeping an eye on me, when I was destined to rule them all." Prometheus responded. "Arrogant fools who runs with the Jump world... must be punished accordingly."
"That's why I had to merge the worlds. However, a mortal used the power of god just to fell me!" Prometheus called out on Jumpson's actions. "Because of all they have, I swore that I'll have revenge, by destroying Jump and serving for the great Empress Zero!"
"Are you an evil spirit donning the armor of a god!?" Chloe asked.
"More than that." Prometheus replied. "Because I have been revived by the great Empress-"
"For disrespecting the Princess, the captain-" EX called out Prometheus.
"Silence! I am far beyond you!" Prometheus interrupted EX.
"No way, do I look like a princess who's mentally disabled?" The Princess argued. "Set beside temptation, I am that good at fighting-"
"No excuses!" Prometheus shut the Princess up, much to the latter's disappointment.
"Hey, you! Disrespectful and offensive!" Kai called out Prometheus.
"That ghost girl is too young for your human form to embrace." Prometheus tried to correct Kai.
"No, I'm grown up! I'm 28 years old!" Chloe corrected Prometheus. "Besides, you're just as scary as the evil spirits we exterminated!"
"What's your Base Program?" Chrome asked Prometheus.
Note: "It defines our 'soul', gives us purpose. From a human perspective, it's our 'reason to live'." - said Chrome, during 'Captain Velvet Meteor: The Jump Dimensions'
"I told you all. I uses to storytelling, but I have come to desire to rule Jump altogether, free of folly from human artists." Prometheus replied. "However, I only possess an AI-based armor."
"Why would you be able to copy the Hegemony Laws!?" Marie asked.
"Empress Zero is able to hack it all, and bring its powers to us." Prometheus replied. "That is a blessing for me."
"What else do you want?" Chloe asked back.
"Empress Zero will take on the omniverse and be the one to rule them all." Prometheus replied. "I'll gladly serve her and the commandments."
Prometheus then stood up and kicked a small boulder into the Princess, but she swinged EX up and cleaved it.
"You better not forget me as a knight, as with the warriors like them!" The Princess exclaimed.
floats in the air* "Does it matter? When you're facing a part of a revolution?" Prometheus then got back to his lair. "Finally, there's my home. I'm back."
"Proceed to chase the danger." Chrome then chased Prometheus.
"Got it!" Everyone else there followed.
Prometheus flew through Noah and some, as well as Jay-P and Captain Velvet Meteor. Seeing the Daikaiser flying, they all gather and chased.
"All right, that's a mission for Captain Velvet Meteor!" Velvet Meteor joined the chase.
"Let's go!" Jay-P joined. "Adventure Bot coming!"
"Captain, wait!" Kazui shouted.
"Emergency situation, please understand!" Jay-P away.
"Awww..." Ichika is disappointed.
Leading to the same tunnel as before, many people arrived at Prometheus' lair.
"Hey you! Why are you here right now?" Goku noticed.
"Prometheus went to here." Marie explained. "He finally woke up and returned to form."
"Oh, you gathered more?" Velvet Meteor asked.
"Captain, due to previously unforeseen circumstances, a lot of us has to be gathered." Naruto explained.
"Prometheus is back!" Jumpson warned everyone.
"That sucks!" Luffy is disappointed.
"Welcome back, you lowlifes and those two humans." Prometheus greeted everyone.
"You're... Prometheus?" Velvet Meteor asked. "From Umbras?"
"Precisely." Prometheus confirmed. "I was merely attempting to fulfill my role as Keyman."
"We meet again, Prometheus." Jumpson recognized Prometheus. "Promised to rule over the merged world."
"I am a resident of Umbras, and a member of a group known collectively as the Keyman." Prometheus introduced himself (properly). "The Keyman use the power of the Onyx Books to convey the events of the Jump World to the real world, as stories."
"That's probably how I can meet you guys, right?" Velvet Meteor asked.
"This was our lot in life: to indirectly influence those who lived in the real world." Prometheus continued. "Directly interacting with the real world or the Jump worlds was forbidden. All we could do was observe them from what this rift used to be."
"Including me in real life?" Velvet Meteor asked back. "No wonder why I have access to my imagination the way I did back after I moved to Japan."
"Even though the power of the Onyx Books alone would make it trivial to change those very worlds themselves." Prometheus admitted. "So for a long time, I did nothing but observe humans in all their foolishness."
"But despite all of that, the humans has a lot of potential. To improve, to learn, to succeed." Jumpson argued. "Haven't you get that on your fuzzy head, even after I beat you up back then?"
"Because I saw them agonize over idiotic concerns, go astray, make mistakes..." Prometheus explained. "No matter what we wanted and how we tried, it was all for naught."
"I could no longer bear it, so I decided to merge the worlds and guide you directly." Prometheus continued. "Had I managed to fully combine all worlds into one, I would have led you as your one true god. That was the Keyman's true role."
"And yet, you kept underestimating us humans and creatures alike." Jumpson argued. "The Keyman should have at least entrusted the future to the artists and editors and writers, not to force them into your way."
"As a result, once I was revived, I had enough of you and decided to destroy the Jump worlds as well as all others." Prometheus responded. "Empress Zero was, is and will be the savior, and I'm glad to let her help me with your folly."
"Lending help with the one who broke the omniverse?" Noah argued. "That's not good!"
"It has been decided." Prometheus declared. "Not only because you busted me, you also killed off all the Keyman that was on my side during the war."
"We killed off the Keyman because they all tried to finish what you started... which involved merging the world." Jumpson replied.
"That's right." The Hegemonies defended Jumpson.
puts back faceplate* "I have no choice but to eliminate you once and for all!" Prometheus declared.
"Humans are imaginative, creatures are wonderful and magical, machines are robust, and gods are powerful." Mercurius exclaimed. "Together, we will save the reality!"
"Yeah, that's right!" Velvet Meteor concurred.
"All right!" The Ouroboros agreed.
"Touching with my hands will behead anyone." Prometheus chanted. "Thus, I can neither love nor be loved."
"Now they're copying my law!" Marie complained.
"Oh, just how sinful I must be, to be deserving of such punishment." Prometheus chanted, glowing just like before.
"Everyone, watch out!" Kouha/XX warned the alliance.
"That is why I wish for it. The hope that lies at the end of the afterlife." Prometheus chanted. "Because, it must be the light that shines upon everyone far and wide."
"Danger! Danger! Danger!" Jay-P shouted.
"Let us watch over the birth of every new life for all Eternity—" Prometheus chanted. "Because I will hold everyone in my embrace."
"That will remotely decapitate us all!" Ren Fuji realized. "I will stop time!"
"Rinne—Tensei!" Prometheus activated the law and thus is close to decapitating everyone.
"Res Novae!" Ren Fuji shouted. "Also Sprach Zarathustra!"
The time is frozen before Prometheus can fully activate the law copied from Marie.
"David Martinez! Prometheus is trying to decapitate everyone!" Ren Fuji then reached out to David.
Not long after, Ren Fuji approached David and willingly unfroze him, allowing the latter to move around.
"Prometheus is decapitating everyone with improvised Rinne-Tensei?" David asked.
"Yeah, but no more time to explain!" Ren Fuji then immediately took David to Prometheus' current whereabouts."
Upon arrival, the Time Stones is slowly beginning to shine.
"Shoot and stun him before the Time Stones activates!" Ren Fuji told David, and gave him an explosive rifle. "If the Stones activates, my time-stop ability will get nullified and the law would be able to filly activates, resulting in-"
"Ok, choom! Maybe I have to aim quick." David took the gun, loaded it and activated Sandevistan.
David then set foot around and aimed at Prometheus while the relative time sticks as Ren Fuji is stopping its original flow, just to stop Prometheus. All the projectile hitted and exploded, and once the ammos ran out, David deactivated Sandevistan and showed of the explosion that would complete once time pauses.
"And just enough time to pose you!" David then went behind. "Mister Setsuna of the Eternal Lotus Moment, pose yourself!"
"Thanks, but there's no need." Ren Fuji then paused the time.
The explosion is around and complete, stunning Prometheus and crashed with the law, preventing the improvised Rinne-Tensei from being effective and saving everyone.
"How!?" Prometheus is shocked.
"Sandevistan and that Atziluth combined can outrun even Time Stones." Ren Fuji explained.
"You...! How could you get in my way!?" Prometheus is enraged.
"You copied the powers of my beloved goddess, didn't you?" Mercurius asked.
Magsarion then ran and beat up Prometheus.
"Muzan the Remorseless, even if you keep beating me up, I would still be able to erase you from existence!" Prometheus then threw Magsarion away.
"You have been ignorant of those potential and critical to their imagination." Satanel told Prometheus. "Is that how you intended to guide the humans of the real world?"
"Now, seems like humans, creatures, machines and gods are either all flawed or ridiculously trivial, or both." Prometheus argued with Satanel. "You frustrates me."
"Make no mistake, Prometheus!" Shao Kahn argued with Prometheus.
"You care?" David told Prometheus. "We don't."
"I need assistance." Prometheus stood up. "Shadows, Strike and Rebecca, rise!"
"Summoning just like Nekron!?" Hirume wondered.
"Because Nekron sacrificed to give me that ability!" Prometheus responded.
The Shadows returned, now will two full teams. Shadows' Investigation Team is back, and now, the Shadows' S.E.E.S. has come, including Shadow Aigis, and then some.
"The Shadows are back!" The Phantom Thieves noticed.
"We're the Shadows... The true selves..." The Shadows chanted.
Among the Shadows, there's shadowy figures that resembles Makoto Yuki and Kotone Shiomi, but being dark and grayscale overall. This time, their eyes are yellow, not white like original was.
"Our... Shadows?" Kotone noticed the Shadows.
"I am a Shadow, the true self! You all wanted to see me again, right!?" Shadow Makoto told members of S.E.E.S.. "Well, here I am!"
"Watch out." Makoto Yuki warned everyone.
"It's the same one who held the... Abyss of Time... and... no..." Aigis is shocked. "From us!?"
"Do you know me?" Shadow Kotone acted as if S.E.E.S. might not recognize her. "Look, do you-"
"What're they talking about!?" Kotone complained about the Shadows.
"They are false Shadows, born from the negativity of humans' hearts." Yu explained. "You guys have Persona, and thus is in control of your real Shadows."
"Then what do you expect from a Shadow Self of the wrong version?" Kotone took her naginata and targeted her doppelganger. "Let's go then."
Similarly, Makoto Yuki grabbed his sword and run against his doppelganger.
To be continued...