by Pottu » Wed Mar 02, 2016 5:51 pm
The despawn only happens if a player fails the quest and there is nobody present to make the Cleaner appear. It is supposed to be difficult and an epic quest and the reward is the best healing weapon in-the game currently, which priests will arguable keep using deep into Naxxramas. Having to put in a few hours of work over a couple of days (in the worst case scenario) is not asking too much.
The GM team.