Merman pantheon — the Cold Death
The torn remains of anything that dies in the open sea sink downward, to the lair of Drospoly. He lives amidst corpses and deformed monsters in the abyssal depths where sunlight never reaches and where the water is always freezing-cold. Drospoly’s existence is a secret horror known only to the merfolk, who fear him greatly.
Mermen make no images of him, lest evil befall the maker.