The mighty fortress carved within the fiery bowels of Blackrock Mountain was held by the sinister Dark Iron dwarves for centuries until Nefarian - the cunning son of the dragon, Deathwing - took control of the upper Spire and made war on the dwarves' holdings in the mountain's volcanic depths. Realizing that the dwarves were led by the mighty fire elemental, Ragnaros - Nefarian vowed to crush his enemies and claim the whole of Blackrock mountain for himself.