Quote from : Daughter of Smoke & Bone Book

In moments Akiva was up in the ether, scarcely feeling the sting of ice crystals in the thin air. He let his glamour fall away, and his wings were like sheets of fire sweeping the black of the heavens. He moved at speed, onward toward another human city to find another doorway bitter with the devil's magic, and after that another, until all bore the black handprint....Once all the doors were marked, the end would begin. And it would begin with fire.