Okay, I read a couple pages on the topic and then skipped mostly to the end just to see where we'd gotten so far with this idea. Maybe it was already discussed, but when you defeat Izual and release him, doesn't he confess that he's the one that gave Tyrael the soulstones, knowing that the Diablo and his brothers would be able to corrupt them? Don't get me wrong, I'm all for an epic battle for Tyrael's soul, but from everything I've seen so far in the story, it seems like Tyrael's one of the only agents of Heaven who's trying to prevent humanity from being overrun my demon hordes.
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