Eibon

エイボン

Eibon is a mysterious sorcerer and a former acquaintance, if not a friend, of Shinigami, who is honored for creating many Demon Tools, including Brew. As one of the eight Great Old Ones, his "wisdom" and mere existence drive men to madness.
Known as the "Great Sorcerer," he is the most powerful Sorcerer in the world, was a member of the Eight Warlords, and was a former friend of Death himself.