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Trau'ug was a part of the Cabal military stationed on Mars. He attempted to get permission to invade the Reef from the Cabal high command, but was denied. Trau'ug saw the action as a sign of weakness within the command, so he gathered his legion that swore loyalty to him and killed the officers who opposed him. As a result, he was considered a traitor to the Empire.
He took his legion and went to conquer the Reef, but was defeated by the Reef forces and later thrown into the Prison of Elders.