Dagon

Dagon (pronounced DAY-gon) is the demon lord of the sea and sea monsters that dwell in its darkest depths. Like other demon lords, Dagon is able to grant spells and other powers to his worshipers. He encourages them to swim underwater, increase their own strength, and propagate dangerous sea monsters. He considers the breaking of oaths as a sin against him, forbids his followers to settle in land-locked areas and share any secrets with those outside of his cult.