Upper Blackrock Spire (UBRS) is the upper area of greater Blackrock Spire complex, and serves as a main base of operations for the Ironmarch expedition of the Iron Horde in Azeroth, led by one of the Garrosh's staunchest supporters, Warlord Zaela. Formerly occupied by the Dark Horde and black dragonflight under Nefarian, remnants of his forces also entrenched themselves in the area.