Last Star: Pengrove Witches

Waking in the woods, naked and covered in blood, Amy doesn't know where she is or what she's done.
Particularly to the dead body lying next to her, a creature she swears she knows.
She finds her way to a mansion where she's rescued.
But her memories are gone.
No name.
No family.
Amnesia brought on by the head wound she cannot explain. She ends up in Pengrove, a town built around a university and famous for the legends of the Pengrove Witches.
But Amy isn't sure she believes in magic.
That is until she recalls a few details surrounding her injuries. Red lightning.
A white stag.
A purple cloak.
And the heart of a star.
A fallen star. What it all means is hidden from her, but that doesn't stop those seeking her unique gifts from trying to help her remember. Because inside of Amy is a power no one else possesses. The power to bring about the end of the world.