The Divine Talisman: Book Three of the Legend of Asahiel (The Legend of Asahiel Series 3)

Torin, king of Alson, sacrificed himself to protect his people from the demonic Illysp. Now his best friend and former love work to restore the devastated lands beyond their borders. A treacherous attack strips them of their most powerful weapon—the Crimson Sword. With their defenses shattered, Pentania's citizens face conquest or death. The situation grows more dire when the Leviathan, an unfathomable creature of immense destructive power, is awakened. Hope appears slim, resting only on the efforts of a lone elf, a mad witch, and a fallen hero tasked with solving a series of divine riddles. The world's survival depends on whether they can break the bonds of a powerful, insidious possession.