The history of this imposing fortress is long and complex. Carved into the fiery core of Blackrock Mountain by the Dark Iron clan centuries ago, and eventually taken by the black dragon Nefarian and his brood, the upper reaches of Blackrock Spire are now home to the Ironmarch vanguard. As preparations to use the Spire as the staging ground for a full-scale invasion of Azeroth continue, the Iron Horde has set up a terrifying contingency plan: a doomsday weapon within the heart of Blackrock Mountain.
Hotfix (2014-10-14):Resolved an issue where items were incorrectly disenchanting into Warlords of Draenor enchanting materials.
This is in reference to the special level 90 version of UBRS that existed during the Iron Horde Incursion world event.
Patch 6.0.2 (2014-10-14): Now a separate instance from LBRS, retuned for level 100 players. Encounters updated to reflect recent storyline developments. Partially expanded. Blackwing Lair entrance moved to Blackrock Mountain.