undertale:vacant underground(sans)

Description: sans was the only one who knew about the resets which was why chara made sure to kill sans first so the glitch that made sans reamber would not undo her plans,the corrupted code from sanses dust brouet him back to life,but he is now a horrific monster with a giant hole in his head and he becomes ever closer to madness as time goes on,he uses spiked bones and melting gaster blasters and uses a giant bone axe when he feels like his life is in danger,he is the only one in the underground who has not become corrupted by charaes code control but he has become a murderus madman who believes it was frisks fault rather then charas,he serves as the final boss in the genocide route and is made all the more dangerus when he can do 10 damage equal to KR,he also fights you in the pacifist run,but because he has become unstable towards the end,he fights you in the netrual run the least,instead running from you and sometimes setting up deadly traps for you until you confront him in the final hall,