«Sealed By Fire» by Quinn Loftis

Tara Thompson is an elementalist, given the powers of earth when her parents were murdered. Now that she knows about the supernatural world around her, she has been recruited to join other earth elementals at Terra Academy, one of the four schools that train young elementalists to battle against dark elemental spirits and their acolytes. 

But fighting dark spirits isn’t the only thing occupying Tara’s mind. In addition to discovering the supernatural world, Tara has learned that she and Elias–Mr. Tall, Dark, and British and an earth elementalist himself–are soul bonded, which means they hold a special place in the elemental world. Unfortunately, Tara doesn’t have time to dwell on what this means because her best friend, Shelly Smith, has been trapped in the underworld by a crazed fire elemental. The only person who can help her is, Ra Nasir, a fire elementalist from Crimson Academy and one of Elias’s best friends.  

Meanwhile, Shelly will learn that burning in hell is the least of her worries because Osiris,  the lord of the underworld wants her to rule hell by his side. Overseeing lost souls and making demon babies was not in Shelly’s five year plan. She will do whatever it takes, even sacrifice her heart to the handsome Ra, to escape from Osiris’s clutches. But will Ra get to her in time?