Diablo 3: Wars in Heaven? I think some of the angels should (esp. Tyrael) should become corrupt. But then again, this isn't the 'think up your D3 storyline' thread.
I agree with the non-raid format, although I have never played a raiding game. Too me it just seems like too much time that you can't control. In D2 you can bounce around from game to game in a matter of seconds, and not being able to leave a raid for hours seems ludicrous.
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