Dagon

Dagon is a demon lord, also called Prince of the Depths. His realm is the 89th layer of the Abyss, and is known as Shadowsea. Dagon is an obyrith.

Dagon is first mentioned in the first edition Dungeons &amp; Dragons sourcebook Monster Manual II, where it is said in passing that he rules a liquid layer dominated by marine dretches, hezrous, krakens, and horrible fish-monsters.

Description
Dagon's form is a mixture of both fish and octopus.

Cult of Dagon
Dagon is served by aquatic demons, especially wastrilith, and is worshipped by aquatic races such as kraken, chuuls, sea hags, water nagas, and kuo-toa.

The outcast Dagon
The demon lord Dagon should not be confused with the exiled devil of the same name, who dwells on Avernus, first layor of Baator. Originally known as Jaqon, Asmodeus forcibly changed Jaqon's name to Dagon to thwart attempts to summon the offender.