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Conqueror of Naxxramas

From WoWWiki

Conqueror of Naxxramas is a title associated with the achievement  Realm First! Conqueror of Naxxramas, being the first raid on a realm to slay Kel'Thuzad on heroic difficulty.

The title comes after the character's name, in the following format:

<name>, Conqueror of Naxxramas