Mundus in "Dante Must Die" mode in the game 'Devil May Cry'. If you try Dante Must Die mode and don't buy many powerups, like all the life you can get, or vortex, Mundus will kick your ass non-stop. Castelvania 1. Death. ugh. side note:Easiest final boss ever is Yu Yevon in FFX. you can not die during the fight! He brings you back to life!! WTF!