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The Siege of Ulduar (25 player)
Defeat the bosses of The Siege area of Ulduar in 25-player mode.
The Siege of Ulduar (25 player) is an achievement earned by defeating all bosses in The Siege area of Ulduar on 25-player difficulty.
Defeat The Siege Bosses
Enter Ulduar and defeat all bosses located in The Siege area of the raid. At max level this can be done solo without a group.