Note that I already read horrortale comic even though there making more soon. And yes in this fanfiction. After Chara genocide route. Sans was killed by Chara and the world calm to be reset somehow instead of resetting back sans found a glitch to the world and woke up finding himself alive in another twisted evil version of his au. Now alive and trying to a way to get home he then see a kid struggling with another him and his brother trying to kidnapped her how would sans reacted to this au and would sans make it in his home world.
Spoilers for horrortale
There was a dark place a dark void that so dark you can't even see your own self a place where the reset begins after genocide a reset after death but this was no reset it was a gateway a dark red portal opening from the void. As sans couldn't tell what it was but somehow fall in that portal all though sans could be thinking could that be hell. But he was so weak so close to dying he was just done with his life he knew he failed miserable. But all he could remember is frisk slowly turning into Chara he didn't know why this happened.as he closes his eyes later on he wake up alive in snowdin.as sans get up slowly from the snow.
Sans: what...how did I? But? I died?
As sans looks around and then remembers that he reset
Sans: oh what am I thinking. I reset after I died. Heh? I always keep thinking that the end of me.
As he smiles and walk to the snow and find his way home. As he walk he know is that snowdin is pretty much rundown and messing like if it look it like a apocalypse happen.
Sans: huh? Wait? Genocide? No...that can't be. *Looks around* well maybe it is maybe I might have a chance at this.
As he walk to the town he then realize some thing really wrong with people as he saw his folks eating human flesh and people making hot dogs out of people and a lot gore and blood on the floor as he walks by more and smells the scent of blood. As he walk by there playing a song called funhouse - wall of pride. As he hears the song as he travels more into the town smelling the blood and seeing blood and ruins. Looking at all his people. Feeling discussed and seeing everyone all cannibals and savages. Sans start shaking and feeling more scared and frightened. To the point he put his hoodie on and hides his face and runs back to his house where he remember to see if his brother normal. As he went to the door and slam the door shut and even lock it the first time. He then run and try to find his brother but he was part of it.
Sans: pa-papyrus! There some terrible crap going on what the * going on!
*Turns around and see papyrus drinking human blood* papyrus!
Horrortale papyrus: oh hey brother! Look what I found. Hey your not sans why your skull fix?
Sans ran out of door and left the house. As he quickly ran to the forsets as he still hears the song. Sans now scared for his life and now realize he is screwed. This is not his home world undertale it now horrortale. Where all the horror begins.
Sans hides in the back dark spooky woods all by himself.
Sans: what the hell! Where am I! What the * just happen! This is * sick * I never curse like this in years! What the * man! Papyrus and everyone like cannibals eating humans. No...no! This is bold crap! I just lost everyone and I'm stuck here. *Start to cry a little as tears fall to the snow* that means my world got destroyed from Chara! That *! Did this she destroyed my world and now I'm here! That means I'm alone... *Start to get angry as his right eye turns blue* Chara you'll pay! People of snow in you will all pay for killing innocent children humans and eating them like animals! You'll all pay...mark my words.
As sans lying down with his back on the dead tree and looks up to the stars
Sans: papyrus I'm sorry... toriel and frisk...even griliby my old buddy...I well avenge all of y'all...just wait my friends...
Now sans realize he in the world of horrortale full of cannibals and real monsters. He is all alone now getting revenge for the humans what would he do next. How would he find his home. Is his home really gone? Stay tuned.