Has anyone ever thought that it never really was Tyrael? What i mean is what if it was Diablo all along. If you read the Sin War trilogy it says Diablo can take on whatever form pleases him, whatever suits him at the time. I think he deceived you playing as Tyrael all along. Maybe the three brothers conspired for this for a long time. As to killing Diablo in the campaign again, we have no idea what he looks like. The supposed "Diablo" could be just a powerful demon. We also cannot be sure if destroying the Soulstones really killed the brothers, considering their power it would not be folly to assume they manipulated them to work for their plans. Also since the Worldstone was built by the angles to weaken humans over time so none of them could be as powerful as the nephalem (Bul Kathos, Rathma etc.) what do you think is going to happen now that the Worldstone is gone? I am sorry if this has been brought up before.
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