The dual-lived, dual-willed prince of the Abyss, master of the mysterious and king of the deviants.
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The 88th layer of the Abyss, called the Brine Flats by some and Gaping Maw by others, is home to the dual entity known as Demogorgon. It is a realm of salt water and rocky prominences used as rookeries by flying demons. A swirling whirlpool drains water from the river Styx into this Abyssal layer, making it a place of both deep and dark seas as well as fetid swamps. Aboleths, krakens, and other sea monsters war in the depths, but all bow before Demogorgon’s might. Here, Demogorgon has his terrible palace, called Abysm, which rises out of the inky depths. He also a maintains a fortress called Ungorth Reddik in the layer’s grotesque bogs.
From either of these places of dark power, Demogorgon, Lord of all that Swims in Darkness, holds the title Prince of Demons through sheer might alone. In both physical and magical terms, there are few on any plane that could challenge Demogorgon and win.
But that does not mean his title is uncontested. Demogorgon continually wars with both Orcus and Graz’zt, the other two mightiest of the demon princes. Their armies of undead and demons war with Demogorgon’s forces, made up mostly of hezrous, aboleths, scrags, skum, and various ichythoid beasts.
The portion of the palace of Abysm that lies above water takes the form of two serpentine towers, each crowned by skull-shaped minarets. There, Demogorgon labors with arcane skill, attempting to procure secrets ancient even by his eternal reckoning. The bulk of this palace extends deep underwater, in chill and darkened caverns that have never seen a flicker of light. In Ungorth Reddik, Demogorgon keeps his armies and lieutenants, as well as his fiendish creations. The fortress is filled with retrievers, golems, and evil constructs not seen elsewhere on the planes.
Demogorgon is 18 feet tall and bizarre in appearance even by demonic standards. He has two heads, each like that of a hyena. His body is long and serpentine, covered in dark, blue-green scales. His necks are long and snaky. Rather than arms, Demogorgon has two long, sinuous tendrils not unlike the tentacles of an octopus. His legs are lean and muscular, and his long tail is forked.