Swimming through the fetid backwaters of the River Styx as it flows through the bottomless sea rifts of the Abyss comes a tentacled horror known in the nightmares of marines and sailors. Shrroth sometimes pass through the thin barriers between the mortal realm and the underworld. They quickly set up shop along sea lanes where they harry sailors, sink ships for sport, and take prisoners whom they torment and torture mercilessly before devouring them body and soul.