Two imposing serpentine towers emerge from the turbid seas about a hundred miles off the Lemoriax shore. Each ends in a minaret resembling an enormous fanged skull, and together the spires comprise the fearsome fortress Abysm, sanctuary of rhe Prince of Demons himself. Demogorgon stalks the halls and twisting stairs of Abysm, pondering the mysteries of the Abyss and setting grand plans into motion from his remote redoubt. The structure's towers extend so far below the surface of the Gaping Maw's surface that they open into the mysterious Shadowsea, Dagon's realm on the 89th layer of the Abyss. Pacts with the reclusive aquatic obyrith have led to powerful discoveries and experiments, many of which stalk the corridors of Abysm in sentient form.