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The fourth Act of Diablo III takes place in High Heavens. After Diablo was released by Adria, he proceeds to open a portal and enter the location. He easily defeats Imperius, who then flees, and Diablo begins corrupting the High Heavens. Here, the player is tasked with eliminating the forces of evil from the world, once and for all, and restoring the High Heavens to their original state.