About the only thing you really need a tank for is to drag demo away from the group closing rifts in the first phase. You don't want to aggro the mobs because you only get credit towards gold when they're killed.
After that you're just doing what you can to keep your party alive in the second/third phase.
I've also heard it can be a bad idea to tank demogorgon because if he strikes you a number of times, he stuns you - and everyone else. Is this a valid Concern?
I've also heard it can be a bad idea to tank demogorgon because if he strikes you a number of times, he stuns you - and everyone else. Is this a valid Concern?
Not really. Your goal is just to keep him away from the sanity well and away from the group closing rifts. It shouldn't really matter if he stuns you a few times since he doesn't really deal much damage. I tank him on a GF so I can't really see how it would be anything but a cakewalk on an OP.
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After that you're just doing what you can to keep your party alive in the second/third phase.