Karxasis is an osmium dragon. Whereas osmium is hard and brittle, with a blue-gray cast, Karxasis is red. He is extremely heavy, however, and osmium is the densest metal. Since osmium and platinum are in the same subfamily of transition metals, Karxasis is subordinate to Bahamut, The Platinum Dragon. As an infant, Karxasis was part of a five-dragon team who fought and defeated Fraz’lofra, leading to his eventual resurrection as an incomplete dracolich.