Seven Kingdoms: Seowyn's Crossing
Uluthog is known as the Worm who Gnaws the World. Manifesting as a massive purple worm, many of the peoples of Tol believe uluthog created the Underdark as it gnawed its holes, connecting caverns and even worlds. Uluthog’s Underdark connects to the Feydark and the Shadowdark. As a result of its immense size and the fear it is held in by the peoples of the Underdark, Uluthog has become invested as the god of Darkness and Torment.