Dagon

Dagon was the name of a Great Old One worshipped by the Sea Devils. (PROSE: All-Consuming Fire) His name was invoked by commander Krellix. (AUDIO: Tidal Wave)

Behind the scenes

 * Dagon resp. Dagān was an ancient Semitic fertility god who also appeared in the writings of H. P. Lovecraft. In there, it was worshipped by the Deep Ones, aquatic humanoids somewhat similar to the Sea Devils.