Articles about attunements.
“ Obtaining the Drakefire Amulet to Enter Onyxia's Lair (Horde) See also: Warlord's Command...Onyxia's Lair attunement
“Instance attunement refers to the process of gaining permanent access to an instance. The term...Instance attunement
“Many of the instances in the game require keys or attunement to enter, or to reach their...Instance attunement (Original)