Argent Dawn

From Twilight Wiki

The Argent Dawn is a lawful good organization focused on protecting Azeroth from agencies that seek to destroy it, such as the Burning Legion and the Scourge. Base camps of the Argent Dawn can be found in the Eastern and Western Plaguelands as well as in Tirisfal Glades. Reputation with the Argent Dawn can be used to purchase various profession recipes, miscellaneous consumables.

Prior to the release of WotLK, reputation gains with the Argent Dawn helped in reducing the cost of attunement to enter Naxxramas. You could only gain attunement with a minimum reputation of Honored by fulfilling a quest at Lights Hope Chapel. Since Naxxramas was re-released with WotLK, the attunement has been removed.