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One Light in the Darkness (10 player)
Defeat Yogg-Saron with the assistance of one or fewer Keepers in 10-player mode.
One Light in the Darkness (10 player) requires defeating Yogg-Saron with the assistance of only one Keeper active in 10-player mode.
Choose Your Keeper
Select one Keeper to assist you. Thorim provides Fury of the Storm and Titanic Storm, which is the only way to completely kill the Immortal Guardians in Phase 3, making him the most recommended choice. Freya provides Resilience of Nature and Sanity Wells, which are the only source of Sanity restoration during the encounter. Hodir provides Fortitude of Frost and Hodir's Protective Gaze. Mimiron provides Speed of Invention and Destabilization Matrix.
Phase 1: Avoid Clouds
Do not trigger the additional clouds during Phase 1, as this would speed up add spawning unnecessarily. Allow adds to spawn naturally so that only one add is active heading into Phase 2.
Phase 2: Brain Room
Mark a melee DPS player and assign portal groups carefully. If using Freya, position your group near the 9 o'clock position outside the pool after Sara despawns the green clouds, keeping proximity to one of Freya's Sanity Wells and a portal entrance.
Phase 3: Manage Immortal Guardians
If using Thorim, his Titanic Storm ability will permanently kill the Immortal Guardians, making Phase 3 significantly more manageable. Without Thorim, Immortal Guardians cannot be fully killed and will continue to pose a threat throughout the phase.