Diablo: The Veiled Prophet
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From Diablo Wiki
Book Three of the trilogy.
The demon-backed Triune has fallen. All that now stands in Uldyssian's path to freeing humanity is the Cathedral of Light and its charismatic leader the Prophet. But the Prohpet is actually the renegade angel Inarius, who sees the world he created as his uncontested domain. Facing a cunning foe that would just as readily see Sanctuary destroyed than let it slip from his grasp, Uldyssian is blind to the others who would possess his world. Both the Burning Hells and the High Heavens now know of Sanctuary...and their warring hosts of demons and angels will stop at nothing to claim it.
