This thing is completly self indulgent, but if someome finds this and likes it, is welcome to enjoy this mess with me.

"A God from Elsewhere" of SomniumOfLight is my principal inspiration for this, but instead of "Error adopt all the vessels" I'm doing "All the Vessels adopts Error (and Nightmare Gang)" because FGoD stories have a lack of "The Gang follows Error to the other Multiverse" and I want something of that.

The "Forced God of Destruction" original idea comes form harrish6 

English isn't my first language so if I made a mistake please let me know.

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Once upon a time, a multiverse filled with void existed, one single universe could be observed in the infinite black, one universe that was created by the void, and the void was happy, that universe was hers, to protect, to take care of, and even when one of her children fell directly into her void; she didn't destroy him like usually would do with any other thing, no, he still existed and was capable of interact with the universe, even if he couldn't return to it.

Her universe and children weren't perfect, but she would never want them being like that, they lived, they love, hate, were in peace, fight in wars... but soon or later, died, and one part of her always hate that part of them, but was pacifier by the knowledge that their souls would return to her void once they died, and then they would be safe and sound in her arms.

(When the resets started and the souls stop coming to her, she was mad to her insolent child, playing with the lives of their siblings, and causing pain to their brother, so ,she left one soul return to the world to teach them a lesson, her little Chara wouldn't let them do this so called "Genocide" without a cost).

(That didn't stop Frisk to do such terrible things to the Monsters, but their fear and rage each time Chara "ruins" their attempt to do a "Pacifist Route" was enough, for now).

Then, something happened and another universe came into existence.

A universe that wasn't hers, that didn't bear from her void.

It was... a copy of her universe, everything seems similar to hers, the people, the monsters, the resets, everything, except that none of them feel like her children, everyone in her universe have a little of void in them, inside their souls, that is what made them her children, and this universe don't have void in One. Single. Soul.

When the Gaster of this universe fell in her void, she didn't think twice before rip apart his existence out of the multiverse.

She was so mad, who was the responsible of this aberration? Who dare to take the image of her children and take away their void?

She hated this new universe and whoever have created it, so then she looked for a weak point in it and destroy it, she took everyone in the universe and tore them apart in the moment they even rub her void, even when one part of her feels bad (they look exactly like her precious children, how could she not feel bad?) a more vengeful part of her was satisfied, maybe this would teach to its creator to not mess with her multiverse, with her universe.

Of course, not long after that, she felt more universes come to existence.

Oh, she was capable of get rid of the copies of her universe, but the others? The one with the personalities of everyone swapped? Other with that horrible "Kill or be killed" law? (she could almost  felt in her heart sympathy for the inhabitants, suffering for their so-horrible life situation).

She couldn't destroy them, not for lack of attempts, there was something messing with her ability to enter into the codes of the universes, it was far from her reach, she couldn't enter to this universes like she could in hers, the codes of these universe were inside them, so, she was powerless to destroy Underswap and Underfell.

She hated them, at first, but as time passed, she was able to tolerate them, her universe was not being harmed by their existence, she made sure of that by completely blocking the access to all those who did not have Void in their souls.

But where she stop hating the other universes, she despised their creator.

Ink, God of Creation and self-proclaimed Protector of AU's, the son of Fate.

Apparently, Fate decided that her multiverse was "empty" and that her son was "doing her a favor" by fill her multiverse with more universes.

Void knew better, her multiverse was being use like the playground of Ink, no more no less.

Other three universes were created when something changes.

Aftertale, in her eyes, was just another copy of her AU, with the difference that there were more genocides than in hers, then, the Sans of the AU do something and ends in the Save Screen, he was so close to the void that she could just kill him if she wants.

She didn't do that.

That Sans was so scared, so angry and sad for being in the Save Screen, away from his family and friends, away from his brother, his only reason to keep going each day...

He called for help.

The Void responded to his call.

Aftertale!Sans, Geno, became the first child she had outside her universe, Aftertale still hadving a Sans, and soon it became obvious that Geno couldn't get out the Save Screen, so, when her void began to take place in his soul, he didn't have more options that let it happen.

His face the first time she talks to him was adorable.

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The life in the multiverse was good for years after that, Fate's spawn still creating more and more, but her children were okay, Undertale was having more Pacifist routes after Chara took over Frisk body and Geno was having something with Reaper! Sans.

(She wasn't really sure about the relationship, but Geno was so happy so she couldn't really complain about it).

(When they fused their souls and became soulmates and, by extension, Reaper becomes one of hers, all her doubts disappear).

Then, one day Fate seems to decided that her happiness, the happiness of her son wasn't allowed in the multiverse.

One moment she could feel perfectly the soul of Geno along with the rest of her children in Undertale, to the other, she could feel one part of her void being ripped from her.

Her pain was soon taken away by the rage.

She couldn't find Geno anywhere! Not even the image of him like the other AUs, it was like he disappeared in the air.

He wasn't dead, if that were the case, not only her but Reaper could've sensed it, his soul would have merged with her void like all his siblings did before him, and the other god seems as confused as her when find the Save Screen empty, his soulmate nowhere to be found.

For years and years both of them search, in one point Reaper even ask for the help of Fate's spawn (and for Life herself, if he bring back her child, she would never say something against the Creator again).

But the time move forward and Geno didn't appear, but... one day she discovers what happened to him.

She met Destiny; Fate's sister who seems hate her as much as Void for what she was doing to the multiverse. The goodness was very vocal against the actions of her sister when she wasn't around, but she was as powerless as Void when comes to do something against Fate.

Destiny was the one who told her were was Geno, what was happening to him and what Fate has to do with that.

By the end of that she didn't knows what emotion rules over her, sadness or rage, the tears won't stop coming from her eight eyes.

Her poor child was being torture, transformed into something else in a place called the Anti-Void, completely out of her reach, and for what? Just because Fate refused to put a limit on the endless creation of her spawn?

The first time Error, the God of Destruction put a foot outside the Anti-Void, she cried once again. Even when she still could feel her void in his soul, clearly marking him as her lost child, Geno, it became soon obvious that Error didn't remember being Geno, didn't remember her or Reaper.

And as the years go by, her hate towards Ink and Fate increases with each time Error was hurt, mentally and physically, with each time his son tried to commit suicide, each time he asked for help just to be attacked by the blind judges of the multiverse once they were aware of his existence.

But even in the dark times, she soon finds more children who need her protection.

When the Dreamtale universe was created, she saw an opportunity to give Error an ally, the guardian of the Negative Apples was also, without the knowledge of anyone in the universe, the Guardian of the VOID Apples, those two being similar enough to fuse into one.

And when he ate the apples, incapable of take more of the hate of the villagers and the disinterest of his brother anymore? He was soon turned into hers, he was covered in liquid void and his soul now had void like the rest of her children.

The faces of the villagers before they were killed, and the face of his now ex-brother after returning to find nothing were priceless.

It takes some years before Nightmare was capable of hear her and trust her, but once he does, he was on his way to help with the forced job of his brother, taking under his protection others like him, abandoned by their universes and alone in the world until he found and save them.

They soon had void in their souls, children of hers even if they couldn't hear her at the beginning, they were hers and she loves them anyway.

The next time Error was destroying an AU, they show themselves to kill everyone in there, making his job faster.

She wasn't looking the first time they meet, but she saw the results, it went perfect, of course, Error was suspicious at first, believing that maybe it was just a trap or a cruel joke, but with the pass of the years he opens and comes to trust in his brothers (the void in his soul making this easier to do, it was natural for him to trust them).

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Reaper... he was another story.

The lost of Geno, and the later knowledge of who Error was... it was a strong loss to him, the person who he loved the most was now lost, and he didn't have the bravery to try anything with Error, he believed that wasn't fair to no one, even when his soul hurts by the tough of let him go.

Even the kind words and company of Void couldn't do nothing to comfort him, he throws himself to his work, everything to ignore the pain in his chest, just in countable occasions get off his way to help in the destruction of one or other AU.

Void couldn't really blame him for that, even if see one of her children being so depressed, there was nothing she could do but respect his decision.

And the time passed in the multiverse, Fate's spawn formed a team called the Star Sanses with Nightmare's ex-brother, Dream and the Sans from Underswap.

Then he made the Council of Sanses, whose objective was to stop the destruction of AUs by the hands of the now called Dark Sanses.

Many years later, Destiny came to her with a plan to take their children away from Fate's hands.

Then that dammed ambush happens and was time to implement said plan arrives.

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Edit (11/8/2023) : gramatical mistakes fixed. 

So a little bit if information about my multiverse:

1. This muliverse is called Voidverse, because it belongs to Void, she creates the Undertale Original and block the access to it, so Classic Sans isn't gonna appear much.

2. In this multiverse the Gang actively helps Error to drestroy AUs.

3. Error still lives in the Anti-Void because he don't want bring Fate's anger against the Gang.

4. Blueberry is on Ink's side, Error never kidnapp him and made him see the truth of the Balance, so he pretty much believes that Error and the Gang are evil.