Eyanna Oorlu, Mermaid Goddess Of The Celestial Seas

Eyanna Oorlu is an ancient goddess of time immemorial. She is worshipped by various species, most notably merfolk, and also humans and elves which occasionally breed with merfolk; this can happen when a merfolk uses their magic to once a year appear as an elf of human with functional legs...the merfolk that uses this ritual can make it last for up to two weeks, but once it is dismissed it can't be used again until a year has passed.