Swanmays, also known as swan maidens, are a rare and graceful type of fey shapeshifter. All swanmays are female, with an otherworldly beauty. In their humanoid form, they appear as slender women with long flowing platinum blonde hair, and draped in long flowing cloaks of white feathers. When they wrap themselves in their magical feather cloaks, they transform instantly into elegant swans. Without the cloak, a swanmay cannot transform and appears entirely human. The loss of her cloak renders a swanmay vulnerable, and she will do anything to retrieve it.

In their swan form, swanmays can attack with a bite, or use their enormous wings to buffet their foes, causing 2d4 damage, and knocking their target prone. In their humanoid form, they use a weapon, typically a dagger or shortbow. Like other fey, they are vulnerable to cold iron, taking extra +1 damage from weapons made of iron or steel.