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Defeat Yogg-Saron with the assistance of two or fewer Keepers in 25-player mode.

Defeat Yogg-Saron with the assistance of three or fewer Keepers in 25-player mode.

Defeat Yogg-Saron within 7 minutes in 25-player mode.

Defeat Yogg-Saron without any raid member going insane in 25-player mode.

Complete the 25-player raid achievements listed below.

Defeat every boss in Ulduar in 25-player mode.

Defeat the bosses of The Descent into Madness area of Ulduar in 25-player mode.

Defeat the Assembly of Iron with Steelbreaker as the last member alive in 25-player mode.

Defeat the bosses of The Antechamber area of Ulduar in 25-player mode.

Defeat General Vezax after defeating the Saronite Animus in 25-player mode.

Defeat General Vezax without any raid member being hit by Shadow Crash in 25-player mode.

Defeat Hodir before he shatters his rare cache in 25-player mode.

Defeat Hodir without any raid member having more than 2 stacks of Biting Cold in 25-player mode.

Defeat Hodir without any friendly NPC dying in 25-player mode.

Defeat Hodir without any raid member being hit by Flash Freeze in 25-player mode.