The Boi of Feather and Steel (Metamorphosis #2) (Paperback)
After stealing the Heart of a magical world with the help of a supernatural assassin, Tav discovers that they can't just see magic -- they know how to use it. Returning to the human City of Ghosts, Tav, Eli, and Cam race to heal the wounds in the veil between worlds before the Earth's lifeforce is drained by the tyrannical Witch Lord ... and Eli's new Heart-infused body falls apart.
Meanwhile, in the City of Eyes, Kite has joined forces with the bloodthirsty childwitch Clytemnestra, and together they are raising an army to overthrow the world-eating Coven.
With blood and magic spilled on both sides, who will survive?