General Grebo was the second in command of the Horde forces in Stonetalon Mountains, under Overlord Krom'gar. Much like the Overlord himself, Grebo was capable of immense cruelty and demonstrated this no better than when his troops accompanied Krom'gar as he murdered the son of High Chieftain Cliffwalker who had been dispatched to ascertain whether or not Thal'darah Grove was in possession of weapons that might be utilized against the Horde.
As revenge for the death of his son, Grebo was killed by High Chieftain Cliffwalker during the quest  . The death of Grebo resulted in the murder of Cliffwalker's wife and the burning of Cliffwalker Post by Krom'gar's forces. Warchief Garrosh Hellscream intervened shortly thereafter and, for his transgressions against innocents and the deaths of the Cliffwalkers, executed Krom'gar and disbanded the force he commanded.
- Patch 4.0.3a (2010-11-23): Added.