Eldritchdust

His true form

"I don't know if it's possible to do much about her condition. And what's more alarming is she's passively losing determination. However it seems it will stop after it reaches a certain amount, all I could do is reduce the pain and hope that nothing worse happens later". chara said with a mix of anger and regret in her voice.

"There's nothing you or frisk could do now even if both of you weren't drained. And while His words may have an emotionless hatred within them and his indifferent attitude towards us is very clear. there's still some truth in his words, until either of you manage to recover and get stronger I'm kind of the second last chance we have against sans". Charisk said in agreement and with honesty about the situation. "Though I think I can help frisk, you should probably try to focus on recovering". Charisk said to chara knowing the desperation of the situation.

Before long Charisk had managed to heal frisk. However the curse mark and the holes in frisk's soul still remained. It seemed she just wasn't powerful enough to do much about them. This however reminded her of the research she was working on before chara told her that frisk was in need of help. It was research into cosmic beings. While it was unlikely to be capable of surpassing what sans now was. In the correct circumstances it would allow her to rival sans. However she was inevitably going to need help from gaster.

The few who remembered gaster often referred to him as the man who speaks in hands. But only sans has ever referred to gaster as gaster. Why this matters is because the man who speaks in hands is known to be a cosmic being who rules over the void. To become a cosmic being normally would require either the help of a cosmic being or knowing enough knowledge on how it works. And even if she knew all she needed to. Her access to the void was limited at best. It was as much a necessity as it was fitting.

Gaster was inevitably going to be the last option against sans regardless. Anyone could see what sans likely had planned for later. He's been going after what he considered threats in order of least powerful to most powerful. And he did threaten to destroy 1 or more dimensions within this world. The only path from there was the destruction of the universe. Regardless of what method he decided for it. But while Charisk was still thinking about this situation.

There was a very loud shockwave that echoed throughout the underground. The barrier was destroyed. This sent an unnerving feeling across frisk chara and Charisk. Either sans did this on purpose or it was beyond his control because of how powerful he became. In either case he was at least as powerful as 7 human souls combined. Which inherently required at least 1 monster soul for such a combination. After frisk felt well enough the trio went to the surface. Something had to be going on.

Why now in particular was the barrier broken?. The trio knew they should at least check so they could determine if anything new happened. When they arrived it appeared to be normal. It was night but that's all they could find. "Only 2 of you are capable of seeing the nonexistent object in the sky. don't worry, it doesn't destroy dimensions that often". Said a crazy skeleton that the trio soon found and recognized the image of. It wasn't that difficult to figure out it was an avatar of sans. Though it was oddly the least violent so far.

Frisk knew better than to even attempt to look around at what the skeleton was trying to show them. However that didn't stop chara or Charisk. After looking around enough they could see some entity that shouldn't exist. It appeared to be a giant galaxy in the shape of sans. With the exact same shadowy shade of purple. Even it's eyes were the same as sans. Though it had certain key differences from the sans they knew. His gaze felt unending. Like he has seen or can see every possible future.

He felt like he was everywhere and nowhere. Like if information itself had an undefined existence. Yet his very form inspires both fear and a strange feeling of the unknown that even the best mortal minds couldn't comprehend. And yet there felt like there was still a lot that was not known. "Interesting, didn't think any of you would so blindly choose to see the 'real' me". The being said with an obvious yet truthful expression. The trio soon recognized the connection. Though frisk was uncomfortable with the very idea that this entity was the true form of sans.

Even if frisk didn't want to acknowledge the existence of this entity. All 3 of them heard it and not one of them have ever gotten that crazy. And the words of that crazy skeleton backed up the existence of The entity. It's existence worked on an almost alien form of logic. It exists because it can. Because it wants to exist. Because it was sans. But it will never fully exist. By dieing via erasure he was freed from the cycle of life and death. He by that point didn't exist enough to truly return all the way.

Either he adapted to nonexistence and this was the result or it was something like a scar on his existence for surviving erasure. Regardless. This was basically everything frisk knew about this being. To little was known. And the being at least partly existed. There was no reason to reject the existence of The entity. It truly was formed of madness. All that could be done is hope for either a better dimension or the preservation of this dimension.