The Lux Series is a series of young adult paranormal romance novels by literature author Jennifer L. Armentrout. It consists of Obsidian, Onyx, Opal, Origin, and Opposition. A feature film adaptation of the first book was in the works but seems like the project is on hold for now.
The series centers on a girl named Katy Swartz and her moving to West Virginia with her mother sometime after her father's passing.