Insanity Sans is a insane Sans AU that was injected with determination. Insanity can do whatever the human can do due to his determination. He holds his brother's skull. Info and abilities: https://villainsfanon.fandom.com/wiki/Sans_(Undertale:_Insanity) (Have AI look at it) More info and abilities: https://undertale-au-fanon.fandom.com/wiki/Insanity_Sans/Undertale:_Insanity (Have AI look at it)