Tyrael

Tyrael is an Archangel who rebelled against heaven in order to teach the Horadrim how to seal the Prime Evils's souls into soulstones, thereby trapping them for eternity. He is captured by Baal after he fails to stop Diablo from releasing Baal and eventually freed by the adventurer. He comes back when the adventurer reaches the Pandemonium Fortress, the last bastion before Hell, to offer his protection.

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