Lore:

Sans on his way to the genocide route to judge the human, went something really terrible, after a long battle, they punch his right eye sockets during he was injured, before they killed the king and get to the surface, but sans was enable to get into the surface before the human annihilates them, the human starting a rampage during the population of the monsters while they was a devil, but sans was the hero to save this tale, and the name Aliza was able to help him.