help plz, unit replace trouble

undefinedundefined Hey Ive been wondering how this trigger works, its for my samurai Honshu open rpg, im new at triggers so dont flame me, how do you set it so when a hero gets to a certain level he becomes another type of unit with the same items at the location where the last unit was? im confused here can some one help me out? :(

Umm, it's easier just to give the unit a chaos ability. The replace unit trigger is buggy with heroes (it intermittently screws up).