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The Needlerock stone troggs are located in Needlerock Chasm and Needlerock Slag in the Deepholm. They were led by Bouldergut until his death by the hands of the adventurers of the Alliance and Horde during Cataclysm era.
Bouldergut was later succeeded by Borlock. During the Burning Legion's third invasion, the stone troggs witnessed the Doomhammer and fel entering the Deepholm. Therazane suspected that Geth'xun corrupted them becoming the Felrock in service of the Burning Legion. They were found in Pale Roost where they tormented stone drakes. There they were attacked by the shaman of the Earthen Ring.