Katabasis by Apex Altra

In an alternate Earth where humans have the heads of animals, and where the animals aren’t always what they seem, the Firebird rules myth and legend. Said to have divine power, it appears every millennium to grant wishes for a select few who are lucky enough to find it. Phoebe Ashcroft is one of those people. There are only two problems: She doesn’t remember ever seeing it, and she definitely doesn’t remember wishing for immortality!

All she wants to do is get a degree. But after being forced into a deadly magical ritual, she’s taken in by an organization dedicated to uncovering the Firebird’s secrets. To make matters worse, she’s stuck with the ritual’s other participant- and he only has bloodshed on his mind. Now she must utilize both her ability and her changing perceptions of herself in order to track down the Firebird for a second wish.

But Phoebe’s attacker is still on the loose, and the task is more dangerous than anyone realizes…