An'owyn, along with An'telas and An'daroth, was a heavily-guarded, hidden location in Quel'Thalas which held a piece of mooncrystal for the Key of the Three Moons, that, when combined, produced a powerful key to bring down the second Moongate. During Arthas's mission to the Sunwell, to resurrect the rotting remains of Kel'Thuzad, a traitorous Quel'Thalas wizard named Dar'Khan Drathir provided Arthas with information about the Key of the Three Moons and their whereabouts.