Remnants: Season of Fire by Lisa Tawn Bergren
After tackling her first mission and coming to terms with her power of empathy, Andriana and her fellow Remnants discover their first battles were only a taste of what is to come. As the Sons of Sheol continue their assault on the world, planning to keep all hope dead, the Remnant finds itself battling within its ranks. With everyone pursuing what they feel is the best course of action, trouble mounts-and Andrei finds herself in terrible danger at the hands of Keallach. The Remnant must travel to Italy and find a way to fight as one before it is too late.