In the mythological writings of William Blake, Urthona (likely intended to imply "earth owner") is one of the four Zoas, who were created when Albion, the primordial man, was divided fourfold. Specifically, he is the Zoa of inspiration, creativity and the north, and he is a blacksmith god. His female counterpart is Enitharmon. Urthona usually appears in his "fallen" form, that of Los.
Urthona was introduced during the 2014 Kappa and the Lost Utopia event alongside Albion and the three other Zoa. He can be fused by players with the Zoas plugin through a special double fusion of Sudama and Erthys. Like Albion and the others, he possesses a feature called Milton, which gives him 100% elemental resistance according to which Zoa are in the party. After Mitama fusion, he gains another feature called Bunrei (分霊, lit. Divided Spirit) which increases his elemental damage by 50% according to which Zoa are in the party.