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. Raiders may choose to kill all three drakes or leave some combination of them alive. Completing the encounter with one or more drakes up increases both the difficulty and the quality of loot that drops.

A 10 and 25-player version of this raid exists.

In the wake of the Nexus War, Alexstrasza tasked her children with rooting out any danger and treachery within the Wyrmrest Accord. They quickly located a clutch of twilight dragon eggs within the Obsidian Sanctum. With their resources already strained in dealing with the Scourge and the blue dragonflight, Alexstrasza's consort, Korialstrasz, has sent word of the eggs to Dalaran's Council of Six in the hopes that able-bodied adventurers can enter the sanctum and destroy the twisted progeny of Deathwing.

Dungeon denizens

• Black dragon (one, Sartharion)
• Black dragonspawn
• Black drakonids
• Fire elementals
• Twilight drakes (three, Shadron, Tenebron, and Vesperon)
• Twilight dragon whelps

Bosses

•   Sartharion

Mini bosses

•   Shadron
•  Tenebron

•   Vesperon

Mobs

• Acolyte of Shadron
• Acolyte of Vesperon
• Disciple of Shadron
• Disciple of Vesperon
• Lava Blaze
• Onyx Blaze Mistress
• Onyx Brood General
• Onyx Flight Captain
• Onyx Sanctum Guardian
• Sartharion Twilight Whelp
• Twilight Whelp

Achievements

10-player mode	25-player mode	Objective
[Besting the Black Dragonflight]	[Besting the Black Dragonflight]	Defeat Sartharion in The Obsidian Sanctum
[Gonna Go When the Volcano Blows]	[Gonna Go When the Volcano Blows]	Defeat Sartharion without getting hit by Lava Strike
[Less Is More]	[Less Is More]	Defeat Sartharion and the Twilight drakes in The Obsidian Sanctum with fewer than 9/21
[Twilight Assist]	[Twilight Assist]	With at least one Twilight Drake still alive, engage and defeat Sartharion in The Obsidian Sanctum
[Twilight Duo]	[Twilight Duo]	With at least two Twilight Drakes still alive, engage and defeat Sartharion in The Obsidian Sanctum
[The Twilight Zone]	[The Twilight Zone]	With all three Twilight Drakes still alive, engage and defeat Sartharion <the Onyx Guardian> in The Obsidian Sanctum