The Siege of Ulduar (25 player)
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|  The Siege of Ulduar (25 player)
| 10 
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| Defeat the bosses of The Siege area of Ulduar in 25-player mode. | ||||
| Criteria:
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Heroic: The Siege of Ulduar is an end game raid achievement. Completing this achievement is criteria for the meta achievement Heroic: The Secrets of Ulduar.
Location
The 
Flame Leviathan, Ignis the Furnace Master, Razorscale and the XT-002 Deconstructor are all located within The Siege of Ulduar.
