" HE WAS KNOWN AS THE Dark One. Malach ha-Maet. Yama. Azreal. Shadow Walker. Mairya. King of the Dead. He was all of those things and more, for he was a Lord of the Underworld. Long ago he had opened dimOuniak, a powerful box made from the bones of a goddess, unleashing a horde of demons upon the earth. As punishment, he and the warriors who aided him were forced to house those demons inside themselves, melding light and darkness, order and chaos, until they were barely able to retain any tether on the disciplined warriors they’d once been. Because "

― Gena Showalter , The Darkest Kiss (Lords of the Underworld, #2)