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Observed (25 player)
Defeat Algalon the Observer in 25-player mode.
Observed (25 player) is an achievement earned by defeating Algalon the Observer in 25-player mode, rewarding the title The Astral Walker.
Note the Weekly Time Limit
Algalon the Observer can only be attempted for 1 hour per raid week total — once that hour is spent, he despawns and cannot be re-engaged until the next weekly reset.
Enter and Defeat Algalon
Enter Ulduar on 25-player difficulty and defeat Algalon the Observer to complete the achievement and earn the title The Astral Walker.