Tirisgarde

The Tirisgarde is the elite mage-guard of Dalaran who are stationed in the Hall of the Guardian. It was originally created by the Council of Tirisfal after Aegwynn refused to relinquish her position as Guardian of Tirisfal.
Upon the Legion invasion, the Tirisgarde has been reformed by Meryl Felstorm, serving as a union for all of Azeroth's mages.