Halion. The Obsidian Sanctum is the black dragonflight area of the Chamber of Aspects. The entrance is in Dragonblight [59.3, 49.3] and accessed via a crack in the ice below Wyrmrest Temple. It holds one raid boss, Sartharion the Onyx Guardian, and his three drake lieutenants, Shadron, Tenebron, and Vesperon.