Garreon, often called the Corpsemaster by his brethren, was the Chief Apothecary of the Renegade Astral-Claws Chapter during the Badab War. He was one of the Astral Claws who survived the Loyalist Astartes' final assault on Badab Primaris during the closing days of the conflict. He still serves the whims of his wretched Lord Huron Blackheart, who commands the Renegade warband of Chaos Space-Marines now known as the Red-Corsairs.