Cat's idea: Anti-void and Void are primordial gods sentenced with eternal slumber. Like how Ouranos and Gaea ended. Their realms still exist but the "god" who governs it is in an eternal slumber so the present "gods" use this domains with reckless freedom.

But one fateful day, Anti-void and Void awoken. And it was all because of the broken child that's being tormented in their domains. Anti-void blocked the voices out. Such foul creatures are not welcome. They will protect the child who was imprisoned wrongly in their domain

And when Error fell to the Void? The primordial god known as The Void will make sure that no one will get the tortured skeleton. And the Dadsters might even have fun in taking care of the child.

Anti-Void and Void, the primordial twins. Once again connected to take care of the forced destroyer

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

A rumble echoes across the multiverse, a shudder sending AUs into each other.

Error gets to his feet, his eyelights quickly scanning the list of AUs. He opens a portal, before halting and looking around the white anti-void.

"..." No voices?

"..." Error shakes his head, walking through the portal to an AU.

~
Meanwhile, a drowsy and ancient being slowly opens their eyes, studying the tied up voices.

"Ẅħåṭ ĕꝟîĺ ċȑěȃƭǖŗēś ḧⱥṽɇ ƀëêņ ḧĭḍȉꞥġ ẉīƭḥįǹ ṁỷ ďȏṁⱥi̇ņ?" (What evil creatures have been hiding within my domain?) The voices whimper and whine, but the being slowly gets stabilized and taps the pool upon which the vision of their domain was broadcasting, their view shifting to an AU unlike any others.

"-And that is why we've decided to end your life! You'll-"

"Ŷãẅǹ. Đɵĕŝ ŧȟãţ ḵǐḑ ḵņōẃ ãńýțḥïǹġ ȧḇôűƭ ȟi̇ṡ ḉⱨȯîčȩȿ? Āḇöųť ẃȟáṯ ⱨę'ļḷ ḑô?" (Yawn. Does that kid know anything about his choices? About what he'll do?) The being yawns for real, looking around. "Ḫṃṃṁ...ẁḧèɍě ȋṩ ṃɏ ţẉǐṅ?" (Hmmm...where is my twin?)

"..." The being's focus is drawn to the black-boned monster silently waiting for the end to begin.

"Ĥṃṁḿ...ṁƴ țⱳĭɲ...ẅǐŀƚ ýȭŭ ȧṥșĩṥʈ ṫĥȋș ṣȏŭⱡ?" (Hmmm...my twin...will you assist this soul?) The being chuckles. "Ŧḥïś ȋş ǧȯĭṋǥ țɵ ḇĕ...ïꞥṯȩṝĕṥţïꞥǥ~..." (This is going to be...interesting~...)

~

Error growls, feeling the blood stream down his body and drip to the ground, shivering from the overwhelming cold. He chokes on a whimper, closing his sockets.

"He's almost dead! We've almost won!"

"..." Why...

"..." Why me...?
I҉ a҉m҉ s҉o҉r҉r҉y҉ c҉h҉i҉l҉d҉.҉ B҉u҉t҉ d҉o҉ n҉o҉t҉ w҉o҉r҉r҉y҉ a҉n҉y҉ l҉o҉n҉g҉e҉r҉.҉ Y҉o҉u҉ w҉i҉l҉l҉ b҉e҉ s҉a҉f҉e҉ i҉n҉ m҉y҉ e҉m҉b҉r҉a҉c҉e҉.҉ (I am sorry child. But do not worry any longer. You will be safe in my embrace.)

Error shifts quickly, ignoring the pain to look around the area, panic slowly filling up his soul. Who was that? Where? What-?

Error looks below himself, his eyelights shrinking with shock as a portal opens to the black Void.

"NO one survives the Void Error! What are you doing?!" Error looks at Ink as the portal opens wide enough for the monster to fall through, his first words in nearly a century coming out crystal clear.

"I'm NoT dOiNg ThIs!" And with that call, Error descends into the place no monster survives, the Void significantly warmer than that strange AU.

"WhY aRe YoU dOiNg ThIs?! WhAt Do YoU wAnT fRoM mE?!"

"I҉f҉ I҉ t҉o҉l҉d҉ y҉o҉u҉ w҉e҉ w҉a҉n҉t҉e҉d҉ n҉o҉t҉h҉i҉n҉g҉ b҉u҉t҉ y҉o҉u҉r҉ s҉a҉f҉e҉t҉y҉ a҉n҉d҉ h҉a҉p҉p҉i҉n҉e҉s҉s҉,҉ w҉o҉u҉l҉d҉ y҉o҉u҉ b҉e҉l҉i҉e҉v҉e҉ m҉e҉?҉" (If I told you we wanted nothing but your safety and happiness, would you believe me?) Error scoffs, before yelping as he...gently?...meets a solid surface.

"YoUr AlTrUiStIc GoAlS aNd IdEaLs ArE wAsTeD oN mE. i'M a MuRdErEr, AnD i CaN nEvEr AtOnE fOr ThAt."

"M҉m҉m҉m҉,҉ p҉e҉r҉h҉a҉p҉s҉.҉ P҉e҉r҉h҉a҉p҉s҉ n҉o҉t҉.҉ I҉ a҉m҉ n҉o҉t҉ t҉h҉e҉ j҉u҉d҉g҉e҉ o҉f҉ y҉o҉u҉r҉ c҉a҉p҉a҉c҉i҉t҉y҉ f҉o҉r҉ r҉e҉d҉e҉m҉p҉t҉i҉o҉n҉.҉ T҉h҉e҉y҉ a҉r҉e҉.҉" (Mmmm, perhaps. Perhaps not. I am not the judge of your capacity for redemption. They are.)

Error tilts his skull, quickly turning to look behind him, having heard a soft gasp of surprise. The sight Error is met with is a Gaster, a skeleton monster Error himself is very familiar with, due to watching over the Undertale Timelines a lot.

"Error..." Shit.

"ErRoR's NoT hErE." A soft snort leaves the Undertale monster, before he is fully doubled over in laughter. Error's nerves are shot from the whole day's events (first waking up to a voiceless anti-void, then heading to an AU, finding out said AU is a trap to kill him, then being drug to the void by some primordial force, and now meeting Undertale Gaster within said void), and he silently watches as UT Gaster slowly gets his composure back.

"Welcome home, Error." Error's eyelights flit to the ground, the Gaster calmly watching him.

"...WhY aM i HeRe?" UT Gaster hums softly, studying Error.

"Perhaps I should explain this with the others. That would be logical and for the best." UT Gaster sends a mischievous smirk towards Error. "When have I ever been logical?"

Error rolls his eyelights as UT Gaster continues with "You're here because the long slumbering primordials Void and Anti-Void have awoken and decided 'Screw Fate and Destiny, we're protecting the God of Destruction' and well, now you're here."

"...OkAy." Error mutters, blinking as he's suddenly wrapped in a hug, being carried around with the arms wrapped under his armpits.

"Now, let's get you settled in. Food in your tummy, and sleep on your head." Error blinks again, surprise at the situation leaving him unable to register as a house suddenly rises out of the darkness, a soft hum echoing as a Gaster of green color and no eyelights comes into view, gently tending to the garden around him.

"B! We got a child!" A soft chuckle leaves the Gaster, B, who gets to his feet.

"Oh? How wonderful. I'll tell US to get food prepared."

"You better!" B walks into the house, UT following him through, with Error just dangling in his arms. "You'll love it here, Error. Promise!"

~

The twins look at each other for the first time in several centuries.

"Ỷǒǜ ɫɵőḱ ǵǭöɖ." (You look good.) Anti begins, furrowing their brow slightly.

"Y҉o҉u҉ a҉s҉ w҉e҉l҉l҉.҉" (You as well.) Void responds, the two turning to look at all the smaller deities.

"Ŵȟáṱ ḍơ ƴôǘ ʈĥȉńꝁ ẃė ṧḥȱũƚđ ḋȭ ẃïṭĥ ţȟĕșė ṕꝉìǧḧƭṥ ǻḡąįňśʈ ñӑⱦùꞧê?" (What do you think we should do with these plights against nature?)

"G҉i҉v҉e҉ t҉h҉e҉m҉ a҉ t҉a҉s҉t҉e҉ o҉f҉ t҉h҉e҉i҉r҉ o҉w҉n҉ m҉e҉d҉i҉c҉i҉n҉e҉.҉" (Give them a taste of their own medicine.)

Anti and Void slowly grin, meeting each other's gazes. Chaos smirks, only slightly reminded of why they first offered the idea of making the two primordial deities sleep forevermore.

Twin forces of nature, not to be angered in any capacity. They alone are equal to an entire omniverse. Together? They're unstoppable.

~

Error swears out softly, dodging away from the red beam of magic. He glowers at the Gaster, UF, but has to jump away again due to the red bones coming in his direction. Finally, the Destroyer has enough of this joke and pulls on his strings, tying the entire training room up and forcing UF to cease and desist.

"You would think UF would learn!" Came the very cheery voice that Error thankfully had a lot of practice with dealing with, thanks to Swap. US Gaster is smirking in this strange way like he was getting off to watching UF get his ass handed to him.

Error releases his magic and heads for the exit of the room, only momentarily stopping.

"WhaT's fOr dInnEr uS?" US hums softly.

"Any special holidays today?" Error shrugs.

"NotHinG imPorTanT...juSt tHe dAy i Was CreAteD." US pauses, before gasping.

"Error! That is quite important! Your birthday only comes once a year! And we have many birthdays to make up to you!" US giggles. "I'll get some good-no! Fantastic! Surprises in the works for you." Error sighs, finally leaving the room.

I could spend time with OT, but he'd mostly talk my ear off. I could spend time with UT, but I'd rather not get messy today...

Error heads towards the garden, silently slipping into the rocking chair sitting on the porch.

"Hello, Error."

"MhmM."

The greetings having been completed, both monsters slip into a steady silence, Error slowly looking around before pulling out his knitting equipment and getting to work, hiding said projects any time he hears a noise or sees something.

Logically, he knows his worry is unfounded, but there's a difference between logically knowing something, and feeling safe enough to accept logic as reality.

"Error, dear, US is coming." Error hides his knitting project, before blinking at B, opening his mouth. However, B is proven correct, with US running out onto the patio.

"Error!" Error focuses on the Gaster. "What's the one thing you want for your birthday gift?"

What do I want?

"I waNt tO seE my FriEndS agAin. You KnoW...niGhtMarE, thE gaNg, sWap." US furrows his brow, before nodding.

"Thank you, Error!" With that, US runs back inside, and Error turns his gaze to B, opening his mouth again to ask, but B seems to sense whatever he intends to ask.

"I'll warn you if they are coming. I understand not feeling safe enough to share things you like with us. One: You only met us maybe a week ago. Two: You've lived for so long in a constant state of Fight or Flight. You're bound to have scars, mental scars, from that type of life. And Three: You've been through a lot of change in a short time. The others may forget how jarring it is to end up here, but I do not. I can not see, even after all this time of healing. I know better than anyone how jarring this change can be." B smiles gently.

"So do not worry, Error. I will keep an eye out for them, and warn you, so you may hide your hobby in peace." Error softly smiles, slowly pulling out his knitting, before pausing and blinking at the scarf he's made.

He gets up silently, and when he knows B isn't focusing on him, he drapes the scarf around B's neck, going back to the chair and getting to work.

~

B smiles gently. You may not have completely healed, but you're on the mend, even if you don't see it.

He gently rubs the scarf, his sockets softening at the edges. You don't know it yet, but you've already made progress, Error.

~

Nightmare shifts his tentacles around the group, hiding Killer, Cross, Horror, Dust, Lust, Outer, and Swap from the blank and black expanse around them.

W҉e҉l҉c҉o҉m҉e҉ t҉o҉ m҉y҉ d҉o҉m҉a҉i҉n҉,҉ c҉r҉e҉w҉.҉ (Welcome to my domain, crew.) The voice begins, Nightmare's eyelight narrowing.

"Void." A soft chuckle echoes.

Y҉o҉u҉ k҉n҉o҉w҉ o҉f҉ m҉e҉?҉ (You know of me?)

"Yes. I'm an avid reader, Karma informed me of your awakening, and Error vanished at about the same. I can give an educated guess about you." The chuckle ceases, but the humor does not.

I҉ s҉e҉e҉ w҉h҉y҉ E҉r҉r҉o҉r҉ c҉a҉r҉e҉s҉ d҉e҉a҉r҉l҉y҉ f҉o҉r҉ y҉o҉u҉.҉ H҉e҉ w҉i҉s҉h҉e҉d҉ t҉o҉ s҉e҉e҉ y҉o҉u҉ f҉o҉r҉ h҉i҉s҉ b҉i҉r҉t҉h҉d҉a҉y҉,҉ s҉o҉ I҉'҉v҉e҉ o҉r҉c҉h҉e҉s҉t҉r҉a҉t҉e҉d҉ t҉h҉i҉s҉ s҉u҉r҉p҉r҉i҉s҉e҉ g҉i҉f҉t҉ f҉o҉r҉ h҉i҉m҉ w҉i҉t҉h҉ t҉h҉e҉ g҉u҉a҉r҉d҉i҉a҉n҉s҉ c҉u҉r҉r҉e҉n҉t҉l҉y҉ t҉a҉k҉i҉n҉g҉ c҉a҉r҉e҉ o҉f҉ h҉i҉m҉.҉ (I see why Error cares dearly for you. He wished to see you for his birthday, so I've orchestrated this surprise gift for him with the guardians currently taking care of him.)

"Then lead us to Error."

~

Error shifts as UT's hands cover his sockets, the glitch closing his eye sockets to play along with the surprise.

"Are you sure this won't negatively affect him?" Error gasps, HOPE filling his soul as he wrenches free of UT and happily slams into the goopy body of one of his closest friends.

"NigHtmAre!" The monster before him chuckles softly, pulling him close.

"Hey, Ruru. The gang is here too."

"We've been so worried about you!" Lust's worry overpowers his naturally sultry tone. Error raises his skull to meet the soft lavender ovals filled with worry for him.

"Hey dumbass." Error rolls his eyelights over to Dust, Horror silently waving. Error waves back, resting his gaze on Killer momentarily, who is teasing Cross per usual, and then lands his gaze on Outer, who looks simultaneously worried and happy. Error finally meets the gaze of his closest friend, Swap, who's blue stars are toned down. The smaller monster opens his arms, clearly leaving the chance for Error to reject this. Error, however, in a moment of emotional vulnerability, kneels beside Swap and leans into the hug of the smaller monster. Swap gently pets Error, the glitchy monster releasing a soft purr into the room. B smiles gently, moving forward and sitting down beside Error, petting the purring monster as well. Swap blinks, smiling at B.

"I See You've Gotten His Trust Too."

"Mmm. Perhaps. I've simply been giving him the space to get used to what we offer, and allow him the chance to feel safe." Swap smiles.

"I Know. That's How I Gained His Trust Too."

You're welcome. It's 2 am for me right now. I'll post this up and then I'll head to bed cause oh gosh. XD.