Onyxia's Lair

Onyxia's Lair is a fiery cave in the Wyrmbog, the southern end of Dustwallow Marsh and home to many black dragons. It is the home of Onyxia, brood mother of the black dragonflight, daughter of Deathwing and twin sister of Nefarian, lord of Blackrock Spire. She takes humanoid shapes to meddle in the politics of the mortal races, and she is believed to use a title her father once wore, that of the royal House Prestor.

For years she lived in Stormwind as Lady Katrana Prestor, a royal adviser who held Highlord Bolvar Fordragon's mind captive through an enchanted medallion and urged him not to send troops to Lakeshire. Marshal Reginald Windsor gathered proof against her, but he was captured and jailed in Blackrock Depths, and his findings fell into Dark Iron hands. Adventurers recovered his tablets and broke him out, and in Stormwind Keep he read them aloud in the dragon tongue and exposed her. Onyxia mortally wounded Windsor, left her dragonspawn guards to fight, and fled to her lair.

In the lair, black dragonspawn called Onyxian Warders hold the entrance tunnel, and side tunnels full of Onyxia's eggs flank her cavern. Thrall's Shattered Hand spies in Blackrock Spire learned that her masquerade was an attempt to divide Stormwind and destroy it from within. Thrall wants her dead because her lair lies close to the Horde's capitals, and Bolvar, freed from her spell, warns that she and her kin remain a threat.

Her wards keep out anyone without a Drakefire Amulet. The Alliance quest chain for it begins with Helendis Riverhorn at Morgan's Vigil in the Burning Steppes, follows Windsor's story, and ends with Haleh of the blue dragonflight in Winterspring, who remakes Bolvar's shattered medallion. The Horde chain runs from Warlord Goretooth in Kargath to Thrall in Orgrimmar, Rexxar in Desolace and the illusionist Myranda the Hag, who disguises adventurers as dragonkin to pass the trials of the drake Emberstrife in the Wyrmbog. Both chains need the blood of General Drakkisath, commander of Nefarian's dragonspawn armies, from Upper Blackrock Spire.

Her head goes to Stormwind or Orgrimmar, where it is mounted in public and grants the Rallying Cry of the Dragonslayer, a two-hour buff, to every player in the city. Lorekeeper Lydros of Dire Maul sends holders of Nostro's Compendium of Dragon Slaying here to heat an elven blade in her breath and drive it into her corpse, which yields the sword Quel'Serrar.