Demo Warlock. Awesome epic anima powers, even +50% dmg common powers, a personal tank with up to a few million HP... What do you want more?
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There are not really such attacks. on layer 16/17 your pet has more than a million HP. Nothing does that much damage. And you outrange most of the dangerous abilities if you let your pet do all the work, Which is the safe way, but of course you can still stun/fear/terror/interrupt the elite mobs. ALso you have to be really unlucky not to get HP up powers to not be able to survive a hit or two.