Random Creature Feature:
A Selkie is creature from mythology who can transform from seal to human, and is most widely associated with tragic tales.
A selkie can choose to transform into a human form, and in many tales, upon seeing this form, a human falls in love with them. In one tale, the human hides the selkies skin so she can not transform, and they live together as a good couple until the day where she finds her skin and goes back to the sea, taking all the kids they had with her. The husband, broken hearted, dies alone.