McBurn (マクバーン, makubaan), also known as the Almighty Conflagration (劫炎, gouka) and the Blazing Demon, is associated with Ouroboros as Legion No. I. Similar to Rean Schwarzer, who is "mixed" in his chest, McBurn is mixed throughout his entire body. He wields the sword Angbar (アングバール, angubaaru), one of the weapons forged through Divergent Laws and handed to him by Ouroboros' Grandmaster. McBurn first appeared in Sen no Kiseki II as an enforcer of the Phantasmal Blaze Plan. Currently, not much is known about his background.