Conqueror of Naxxramas is a title associated with the achievement , being the first raid on a realm to slay Kel'Thuzad on heroic difficulty. While many of the "Realm First!" achievements were removed in beta, the realm first kills for Naxxramas, Eye of Eternity and Obsidian Sanctum were preserved.
The title comes after the character's name, in the following format:
- <name>, Conqueror of Naxxramas