The Immortal is a title awarded when you complete the achievement 
[The Immortal]. Raid members must slay all the bosses in Naxxramas on Heroic, during one lockout period, without any raid members dying during any of the boss encounters.
The title appears after your character's name:
- <Name> the Immortal
Patch changes[]
Patch 4.0.3a (2010-11-23): This title can no longer be earned. - Patch 3.0.2 (2008-10-14): Added.
