Downhill sans

Description: this is down hill sans he has a very dark past here's how it happened: long time ago the humans and monsters got along pretty fine except sans. he wasn't happy at all, he didn't seem to trust the humans, that night he over heard three humans planning to hurt the monsters starting with the king, he than popped out of no where and begin to attack them, the next day the humans punished sans and the monsters by slicing their heads off one by one sans was the last he than ended the human race and ended the world and his universe now all he sees is darkness and now he's waiting for vengeance against all who enter his AU