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Defeat Thorim in Ulduar without any raid member being struck by Lightning Charge.

Defeat Thorim while Sif is present in 10-player mode.

Force Thorim to enter the arena while Sif is present in 10-player mode.

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

Defeat Thorim without any raid member being struck by Lightning Charge in 10-player mode.

Complete the Ulduar raid achievements listed below.

Defeat Hodir in Ulduar without any raid member ever gaining more than 2 stacks of Biting Cold.

Defeat Hodir in Ulduar without any raid member being hit by Flash Freeze.

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

Defeat Hodir without any raid member having more than 2 stacks of Biting Cold in 10-player mode.

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

Defeat Hodir without any raid member being hit by Flash Freeze in 10-player mode.

Defeat Auriaya in Ulduar without destroying her Sanctum Sentries.

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

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