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Alone in the Darkness (25 player)
Defeat Yogg-Saron without the assistance of any Keepers in 25-player mode.
Alone in the Darkness (25 player) is an achievement earned by defeating Yogg-Saron in 25-player mode without activating the assistance of any of the four Keepers.
Enter Ulduar 25-player
Enter Ulduar on 25-player difficulty and do not activate any of the four Keepers — Freya, Mimiron, Thorim, or Hodir — before engaging Yogg-Saron.
Understand the stat penalties
Fighting without all four Keepers means you lose 40% additional damage dealt, 20% increased healing, 20% increased movement speed, 20% reduced damage taken, and 20% increased total health compared to having all Keepers active.
Defeat Yogg-Saron
Defeat Yogg-Saron with zero Keeper assistance to earn the achievement and, if your realm has not seen this completed yet, the title Death's Demise.