Mumei Ou, known as the Nameless King in the English localization, is a legendary boss character in the video game Dark Souls III. Renowned for his mastery of dragons and his powerful lightning-based attacks, he is one of the most challenging optional bosses in the game. Once a god of war and the firstborn son of Gwyn, he was stripped of his name and exiled for allying with the dragons. As a mysterious and imposing figure, Mumei Ou’s lore is central to the history of the Dark Souls universe.