Majin Bone Season 1 Episode 20 The Shadow of the Traitors

Despite the oppressive power of the Iron Bone, Dark Wyvern, Leo also becomes an Iron Bone and manages to drive it off.. but it seems unlikely that they'll be able to drive off Dark Wyvern should it appear again. In order to discover how the other Bones can become Iron Bones, Shougo and the team head to the Bone Laboratory in Melbourne.