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Mythic: Cathedral of Eternal Night
Defeat Mephistroth in Cathedral of Eternal Night on Mythic difficulty.
Mythic: Cathedral of Eternal Night is an achievement earned by defeating Mephistroth on Mythic difficulty in the Cathedral of Eternal Night dungeon.
Defeat Mephistroth on Mythic
Enter Cathedral of Eternal Night on Mythic difficulty and defeat Mephistroth, the final boss of the dungeon.