Venifahr, a god-like creature living deep undersea. It is said that it changes between different appearances depending on the time of day it is, but no matter which shape and form it takes you can see through the entity which makes it extremely hard for people to spot the underwater god.
But if it's found, it is said that you are spoken to through mind-waves and that you may achieve immortality while in touch with water. But only if you haven't commited any serious crimes throughout your lifetime.
Very few people have had the luck of finding the gift of eternal underwater breathing.