Massive even for a dragon, Themberchaud was visibly overweight. He had scales as red as lava and bright yellow eyes. His head alone was estimated to be some 20 feet (6.1 meters). By the late 1490s DR, he was barely able to walk; he was unable to fly, only hop and flap his wings helplessly like a chicken; and he often only belched flammable gas when he could not produce flame. He spoke in a booming voice. He was attended to by the Keepers of the Flame, a monastic order of psionic duergar priests.