Brutann was serving as a secret weapon of the Sith Empire, controlling local predators to attack Republic expeditions. Jedi Master Heljus perished in one of such attacks, but lived long enough to ask a Republic hero for help. This Republic hero tracked and killed Brutann and many of his creatures.
In the Onslaught storyline, it is revealed that Brutann was originally from Onderon, and was from a group of people known as the Untamed. He was siblings with the Beast-Lord Akoru. According to Darth Savik, his master served Darth Jadus before the latter's disappearance.