Brynn Myers said this quote

As the red-haired female watched, it was obvious she could not process what was happening. It was as though she had never seen anything magical; her fear had her locked in place, unable to move. In her reality, humans didn’t “feed” off of other humans, but the Sluagh were not human. They were demons and ghosts that haunt and invade. They were your darkest fears. The nightmarish creatures were a part of folklore passed down from generation to generation. The Sluagh were in essence rejected by heaven and hell, existing in the human realm only to consume souls. Humans were blinded by the magic that existed in the world. They assumed fairytales were just someone’s wild imagination, creative tales told to delight and frighten children. It was this lack of acknowledgement that made humans the perfect prey for these outcasts.