Board Thread:General Discussion/@comment-26643689-20161104134413/@comment-31577662-20170322175828

He is the toughest monster, not the strongest, the strongest boss is Asriel (God of HyperDeath), because he have ALL the monsters souls and 6 human souls (or, 7 human souls, because all monster souls are equivalent to a human soul), The power to save, reset, destroy worlds with a snap of fingers, he can even kill Napstablook.