Geffen

Geffen is Gwen's twin brother. He was a traitor to Tanner and Gwen when he ran away and told Gor the locations of the pieces of The Mask of Death. He was killed by a landslide in Chasing Evil because he was too scared to jump on to Gulkiens back. Gulkien didn't want to get closer to Geffen because he was putting Gwen in danger so he flew away. In Call to War he was brought back as a corpse and tortured by Derthsin beyond the grave. At the end of Call to War he killed himself for good by jumping off of a cliff. Geffen is a coward.