Vivatera Series by Candace J. Thomas

The elemental balance of Parbraven has shifted. Haunted spirits once touched by elemental magic are now tethered restlessly to the world. Their salvation lies dormant within a simple girl, kept away from the powers controlling the kingdom, a girl named Naomi. The only one who knows her secret is the mysterious rogue, Reynolds; and their instant attraction weaves deeper than either expect... moreThe elemental balance of Parbraven has shifted. Haunted spirits once touched by elemental magic are now tethered restlessly to the world. Their salvation lies dormant within a simple girl, kept away from the powers controlling the kingdom, a girl named Naomi. The only one who knows her secret is the mysterious rogue, Reynolds; and their instant attraction weaves deeper than either expect. Reynolds recognizes the magical connection and must act quickly before unraveling everything he has tried to keep hidden--and safe." less

The souls of the dead are restless, hungry for the reforged magic hidden within Naomi's blood. But keeping her safe from the roaming spirits is proving harder than Reynolds could imagine. With help from his half-brother Arie, Reynolds uses his cunning to try and keep Naomi safe from the lure of the River of Souls, where the stains of the dead reside. The rest will not come as long as Naomi is alive.

War has come. Naomi has prepared herself to step forward and embrace her destiny, to return the magic to the earth and free the souls fated to misery. But an ancient spirit as old as the world intervenes, threatening to enslave the souls of Parbraven. The elements must be righted. The Daughters of Prolius must return the magic together, before the possession of all elemental power is lost, and life ceases to exist.