I have Magic Frenzy on a Seer who has mastered the Illusionist class. I'm currently doing a fight where an unlimited number of Mimics attack you six at a time. I can take them all out in one shot with my Seer. :P Then they all come back and I do it again. You have to keep going for four rounds. I'm getting an assload of loot. It was taking forever, though, so I had to save before I finished. :P Whenever the Mimics respawn, they get to act pretty quickly afterwards.