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Prey: A Different Kind of Void (Nightmare)
Defeat Mordril Shadowfell or Deliah Gloomsong on Nightmare mode.
Prey: A Different Kind of Void (Nightmare) is an achievement earned by defeating either Mordril Shadowfell or Deliah Gloomsong on Nightmare difficulty.
Defeat the boss on Nightmare
Enter the encounter and defeat either Mordril Shadowfell or Deliah Gloomsong on Nightmare mode difficulty.