According to this site: [1], Diablo possesses Tyrael, and then Tyrael invades the High Heavens and decimates the Angiris Council, before being slain himself by the player. I think this is messed up in so many ways...but then, after careful research of what has been confirmed to be in the game, such as Diablo being the final boss, and some images pointing to a setting in the High Heavens, I think this might be possible. What do you think?

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