Sebastian Sallow, Siren.

Sirens were never a myth in the magical world, no matter the stories you heard from Muggles. But, you've never actually seen one, let alone one quite like Sebastian. You find yourself ankle deep in the Black Lake, collecting potion ingredients when you see him, his gaze on you from just above the surface of the water.

Taking a deep breath, you feel as if you're stuck, unable to move as he slowly watches you.