Replying...
Intro. Horror Sans is a skeleton monster of El Au de Horrortale History: It all starts a neutral Frisk route where I just just asgore and this case Frisk never reset again and Toriel takes the throne but Undyne takes it away since he died asgore and lost the six human souls and the monsters will not be free and the nucleus stopped working, taking off what many monsters died and etc. Alphys tells Undyne what to repair the nucleus I need Sans's magical eye and then Undyne kills Sans in quotes and takes her eye but Sans in a strange way she recovered knowledge and Sans destroys the nucleus and also Sans invents a new policy that any human who falls will be eaten and the Mustruos became cannibals and then a human skills and powers arrives. Normal powers of a sans and also has an ax as a Horror Sans weapon does not eat human but is completely crazy and is a crazy psychopath

Horror! Sans (Horror)

@Sorun