Marbul was one of the two weasel Assassins in Swartt Sixclaw's horde. His name came from the milky white orb which served as one of his eyes. Marbul was partners with another assassin, Scarback. They were responsible for killing Lardtail under the order of Swartt. He and Scarback were strangled to death by four crows while sleeping outside in the open of the camp in retribution for their murder of Krakulat's mother. It is possible that even if he and Scarback survived, they would have been slain by Swartt's orders for sleeping on duty.