The Book of Azrael (Gods and Monsters 1)

World Ender meets Ender of Worlds…

A thousand years ago, Dianna gave up her life in the deserts of Eoria to save her dying sister. She called upon anyone who would listen, not expecting a monster far worse than any nightmare to answer. Now she does what Kaden asks, even if that means securing an ancient relic from the very creatures that hunt her.