The Nature of Magic - Witchbound, #4

When earth witch Tara Kay returns to her family's land after the violent theft of her magical abilities, her return isn't as celebrated as she had hoped. In search of regaining her blood magic, she soon discovers her hometown isn't just unwelcoming, it's downright dangerous. When Tara accidentally awakens her ancient Guardian from his five-thousand-year slumber, they must contend with their growing dark desires for each other.
But this new creature isn't the only new face in town. Kay and her new Guardian soon find themselves up against an unfamiliar enemy who wields a powerful weapon capable of destroying them all. Together they must rouse a Goddess to save the world from a race from another dimension before they consume all life on earth. Graphic, gritty, bloodthirsty, steamy, and uniquely original, the Witchbound saga is unlike any other horror/paranormal romance series you've ever read and is recommended for mature readers.