are you at the desert or the dream realm? if the desert you need to solve the bosses riddles if in the dream realm refrain from purging you corruption with the cheer leader and you can avoid that outcome of facing the corrupted boss.
The level 3 boss can be bypassed by not purging your corruption from the cheer leader. if you are set on facing the corrupted boss, then use one of the lane clearing attacks and not the standard punch if that does not work then just bypass it.
