Kel'Thuzad's Defeat (25 player)

Heroic: Kel'Thuzad's Defeat is an achievement for killing the Naxxramas boss in 25-player mode.

Locations
Naxxramas is a raid dungeon located in eastern Dragonblight, and Kel'Thuzad is the last boss in the dungeon, in the back of the Frostwyrm Lair. This boss is only accessible once all of the other Naxxramas bosses have been killed.