*Flashback*

POV

Years after Jaune was reborn as William he had to experience the torture that had inflicted upon him towards his mother where he was experimented on along side with his brother Adam and two other's adopted name Ares and Jacob. Another year has passed since the fall of Alphatale began where he saw everyone he cared die. First was his lover Chara the second was Muffet a friend from his brother where he was never had the chance to invite her before the fall and the third was his brother Adam that was killed by his adopted brother Jacob who now goes by the name Infected!Sans now where he went insane and doesn't care to the people who he had hurt all because of his mother who he now despise as a poor excuse of a mother and now the only one left was him and his adopted brother who now became nothing but a killer and had gone into battle with him, Although he never knew to what happend to Ares when Alphatale got destroyed.

And now after hours of constant battle he had finally killed Infected!Sans by using the Mainframe by hacking into it, Tho at a cost of his insanity where he had gone very corrupted monster. Although becoming the reincarnation of Jaune Arc he was not fully corrupted where he had flashes of his past life's memories not remembering who it belong too and why is it him that he his seeing.

Time has passed after the destruction of his homeworld Error!404/Jaune had to hide away in a special part of the Anti-Void that only he can access called the Mainframe/The outer wall. It is a place where he can see all activity in and out of the Anti-Void. He has been there ever since, Alphatale is destroyed and never to be in contact with other AUs, slowly driving himself more and more insane with grief in his isolation, only accompanied by one other is Osiris his stress reliever.

12,000 Thousand years later. 

POV

Error!404/Jaune have stayed into the mainframe for so long that he had decided to come out to see what has changed during his time in isolation in which he had met he's counter part of him and later student Error!Sans and later on he created King Multiverse Sans to do his bidding and be the one behind the strings and collecting codes from other au's to revive his homeworld and had encountered a'lot of enemies, allies and even had the time to train his abilities, his student Error!Sans and even calling himself a self-proclaimed god of the multiverse and the strongest sans in the multiverse due on how powerfull he has become during his isolation in the mainframe.

*Flashback Ends*

Present Time

POV

Meanwhile in the void of Alphatale Error!404 was injured and was near death while battleling 4 people he has faced in the past while the 5th member was corrupted by one of them in which they have decided to team up in order to kill Error!404 once and for all.

Error!404: Ack!

???: Is that all you got? Error!404 how the all mighty god of the multiverse has fallen to us 5.

As the figure then moves through the shadow revealing itself.

The first one to appear is Infinity!Code or Fortran to be precise is a godverse entity who came from the godverse dimension Back when Undertale was created on September 15, 2015, concept arts were made on paper in an attempt to get a feel for the appearances and personalities of several main characters in Undertale. Among these concept arts were two blank sketches of Chara and Frisk who would later serve as an anchor for the development of two Nigh-Omnipotent beings. The true origin of these two beings had nothing to do with Undertale, their story begins at the very start of fiction. Fiction itself is the construct of imagination. From when it began it was that of prose and poetry, or at the very least a child expressing his imagination and creating scenarios in their head to become something more than the bleak world around them. Whatever the true origins of Fiction started from, it was thought to be born from the abstract. Dimensionless. Without meaning or purpose. It is all of these which they'd present everything, including Ada and Fortran, as an unspoken and unthought ideal.

???: Quite indeed father now i'll be the only 404 to ever exist!

As the second figure then revealed itself.

Virus!404 is the first twisted creation by Fortran/Infinity!Code by copying Error!404 codes he manage to create the complete opposite of him and is technically Fortrans son. He only keeps Virus404 existence in secret because of what he represents and offers to Fortrans Schemes. Previously, before Virus404 obtained the Omni-Key, Fortran was fed up with his failures and contemplating his immediate erasure rather than waiting for his own freedom.

??? Patience Virus!404 you will get your chance when we kill him and i'll be retake the multiverse energy inside of you Error!404.

As the third figure reveals itself.

Loading or Loading!Sans is a Fail-safe that the Mainframe created as so to prevent things from breaking the rules of the Reality they all reside in. And Loading's current mission is to retake the multiverse energy inside 404, so far both have fought twice, and each have won once.

???: He's not wrong right there would'nt you agree william?

As the fourth member revealed itself.

Infected or Jacob who Error!404 had thought he had killed him millions of years ago when Alphatale was destroyed.

???: I agree Infected this will be his last stand no more reincarnation and no more Alphatale isn't that right brother?

As the last member reveals itself making Error!404 stunned who he thought he lost during the fall of Alphatale.

Alpha Corruption Sans or Alpha!Sans or by his real name Adam who Error!404 thought he saw his brother murdered by Infected/Jacob but now he's now but corrupted courtesy by Virus!404.

As Error!404 tries to get up but can't due sustaining to much injuries as one of five that Error!404 fought spoke.

Infinity!Code: Whats wrong Error!404? can't fight anymore? that's too bad that you failed just like you did too your family!

Error!404: Shut...up.

Infected: What's that william? say that again i can't hear you?

Error!404: I...said...SHUT UP!!!!!

https://youtu.be/R4dQYGLjHEA

Music Start

Just then the entire void began to shake as Error!404 begins to transform.

Error!404: Arghhhhh!!!!!

His scream is loud enough that it can be felt across the multiverse as the mainframe starts to take form in Error!404's body as a shape starts to materialize in his whole back part of the body.

Infinity!Code: This is it fellas remember once he's done transforming attack at once and dont let him give him a chance to think got it?

Virus!404: Yes father.

Loading: I gotcha boss, I can finally take the multiverse energy away from him.

Infected!Sans: Sure thing *Laugh's manically* I cant wait to kill him once and for all.

Alpha Corruption: I couldn't agree more.

Music Ends

As Error!404 still screaming as his butterfly wings now begin to show.

( Like this but Butterfly!404 instead that his butterfly wings are showing. )

After Error!404 is done transforming he's now showing a serious face with blue veins showing in his entire face and a sign that he's going all out for this as his now on his Butterfly!404 or B!404 form for short.

Butterfly!404: .....

Loading: So this is your so called form? how pathetic you think you can take us fi-ack!

Loading was not able to finish his sentence as his gut gets punch by B!404 with blinding speed.

( Just imagine B!404 doing it to Loading. )

Butterfly!404: Perish.

As he say that he uses one of his wings to Godray Loading erasing him out of existense even if he's part of the Mainframe Butterfly!404's power that came from the Mainframe too is enough to kill loading that will not make him able to come back. As the rest of the members were dumbfounded by this.

Virus!404: Holy shit he just erased Loading!

Infected: Yeah no shit sherlock he just fricking erased him out of existense!

Alpha Corruption: No kidding i wasn't able to see his speed its like it just suddenly increase!

Infinity!Code: All of you shut up! and get ready he's making he's move.

As he said that Butterfly!404 now stares directly at them with pure bloodlust hatred towards them except Alpha Corruption since he has a plan to restore his brother back.

Butterfly!404: Now then the real fight begins now!

Chapter End