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Defeat the bosses of The Plagueworks in Icecrown Citadel in 10-player Heroic mode.

Defeat the first four bosses in Icecrown Citadel in 10-player Heroic mode.

When fighting Thorim in Ulduar, participate in killing the Ancient Rune Giant and the Runic Colossus.

Defeat the Keeper bosses of Ulduar.

Defeat Thorim, the Ancient Rune Giant and the Runic Colossus in 10-player mode.

Defeat the Keeper bosses of Ulduar in 10-player mode.

Defeat Hodir in Ulduar before he shatters his Rare Cache of Winter.

Defeat Hodir in Ulduar without letting any of the frozen adventurers perish.

Defeat Hodir before he shatters his rare cache in 10-player mode.

Defeat Hodir without any friendly NPC dying in 10-player mode.

Complete the 10-player raid achievements listed below.

Defeat Auriaya in Ulduar without destroying her Sanctum Sentries.

Defeat the bosses of the Antechamber area of Ulduar.

Defeat Auriaya without destroying her Sanctum Sentries in 10-player mode.

Defeat the bosses of The Antechamber area of Ulduar in 10-player mode.