Blackrock Caverns is the first of two new wings in Blackrock Spire introduced in World of Warcraft: Cataclysm. It is designed as a 5-man instance for players level 80 to 81. It is a series of tunnels created by Deathwing from the Twilight Highlands to Blackrock Mountain. Here the twisted Twilight's Hammer clan is transporting their supplies back and forth from the Highlands and practicing the mysterious dark arts that transform the zealots into dragonspawn. The forces here are led by the Ascendant Lord Obsidius.