Seraphs (Enclave Series, Book 2)

Living among humans in a postapocalyptic ice age, neomage Thorn St. Croix has learned to count on her friends, but she's lost count of her enemies. She is a source of both fear and fascination for the people of Mineral City. Her powers can save them from the forces of evil, but can also attract demon spawn and succubae. And fighting on her own turf nearly gets Thorn and those she holds dear killed.