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I did it by switching things up as much as I could and not getting hit. Mundus took me a couple of tries, but surprisingly I got the others first try.
Well, I've gotten Hunter, Succubus, and Bob, but Mundus and Virgil are giving me issues. Mundus I think the only problem is that I can never dodge all of his shockwaves, Virgil I just can't get off a full combo before he starts blocking. Meh.. trying again.