Grang was a male Human serving as a commander within the Imperial Military of the Sith Empire, which had been rebuilt, throughout the Galactic War. In the course of the Belsavis invasion, Grang was the leader of Special Operations Group Three. This group was stationed within the Maximum Security Section with the purpose of creating disruption and preparing the path for Groups One and Two as they advanced in their quest to locate the Dread Masters. Sadly, Grang's unit breached the vaults holding the Esh-kha located in the Tomb, leading to their being overwhelmed and almost entirely destroyed. Grang, along with the surviving members, fell back to the Imperial frontline camp, where he enlisted fellow Imperials to launch a counterattack against the Esh-kha.
Colonel Grang is a character that can be found on Belsavis in Star Wars: The Old Republic, a video game. He is the source of the mission "Erasing the Esh-kha" for Imperial players and plays a role in the quest "Key to the Vaults".