Hunt or be Hunted

In a world where witches are hunted and fantastical beasts roam the land, Phoenix already has plenty to fear. One night while out hunting, she comes across a dead witch with a message written next to her in unicorn blood- "Stop your hunting, or stop your living." No witch killed a unicorn, for they were scared animals- much less a member of her own coven. No human had the skills to catch either, let alone kill. This concerns Phoenix; especially when it happens the next night, and the night after that. Something is out there, and they're looking for blood.