Instance attunement refers to the process of gaining permanent access to an instance. The term comes from one of the first of such quests created: File:Neutral 15.png [60] Attunement to the Core. Many of the endgame instances originally required you to complete a quest or obtain a certain item to enter. This strategy has largely been phased out, although some instances (particularly heroic raid modes) still require attunement. Since Patch 2.0.1 the keyring grows dynamically as the player gathers more keys, rather than a certain number slots per so many levels.