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Defeat the bosses of The Frostwing Halls in Icecrown Citadel in 25-player Heroic mode.

Defeat Professor Putricide without using Regurgitated Ooze on the Abomination in 25-player mode.

Enter every portal spawned by Valithria Dreamwalker before healing her to full health in 10-player mode.

Defeat the first four bosses in Icecrown Citadel in 25-player Heroic mode.

Defeat the bosses of The Crimson Hall in Icecrown Citadel in 25-player Heroic mode.

Allow Necrotic Plague to stack to 30 before defeating the Lich King in 10-player mode.

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

Defeat every boss in Icecrown Citadel in 10-player Heroic mode.

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

Complete the 10-player raid achievements listed below.

Defeat Festergut while none of the players in your raid group ever had 3 stacks of Inoculated in 25-player mode.

Defeat the Lich King in Icecrown Citadel in 10-player mode.

Defeat Blood-Queen Lana'thel once as a vampire and again without becoming a vampire in 10-player mode.

Defeat the Lich King in Icecrown Citadel in 25-player mode.

Complete the Northrend quest achievements listed below.