A gigantic beast which dwells in the depths of the Gulf of Rhot. Said to have been exiled from the realm of the Gods for his terrible acts. It is often described as being an evil equal to or greater than Zathroth, and they are said to be locked in a struggle with one another as the Leviathan lures men to their deaths through its servants, such as Gh’nag-gh’a and C’zhur-Gh’ull-Lhaa, whereas Zathroth attempts to destroy life by corrupting every living thing.