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Defeat Lord Rhyolith in Firelands on Heroic Difficulty.

Defeat Beth'tilac in Firelands on Heroic Difficulty.

Defeat 20 Twisted Spirits within 15 seconds during the Jin'do encounter in Zul'Gurub on Heroic Difficulty.

Defeat Bloodlord Mandokir in Zul'Gurub on Heroic Difficulty without killing Ohgan.

Defeat Kel'Thuzad in Naxxramas while killing at least 18 abominations in his chamber in 25-player mode.

Complete the 25-player raid achievements listed below.

Defeat the bosses of Naxxramas with less than 21 people in the zone in 25-player mode.

Defeat every boss in Naxxramas in 25-player mode.

Defeat Kel'Thuzad in Naxxramas in 25-player mode.

Defeat Sapphiron in Naxxramas without any member of the raid having a frost resist value over 100 in 25-player mode.

Defeat Sapphiron in Naxxramas in 25-player mode.

Defeat the 4 Horsemen in Naxxramas, ensuring that they all die within 15 seconds of each other in 25-player mode.

Defeat the bosses of The Military Quarter of Naxxramas in 25-player mode.

Defeat Loatheb in Naxxramas without killing any spores in 25-player mode.

Defeat the bosses of The Plague Quarter of Naxxramas in 25-player mode.