The Mythical Hero's Otherworld Chronicles: Volume 10 by Tatematsuri

The fighting in Faerzen rages on. After their victory in Skye, Liz and the imperial forces set their sights on the kingdom of Esel, hoping to take the war onto Six Kingdoms’ home turf. Hiro looks even farther north, plotting alongside an unlikely ally to confront Nameless once and for all. Together, he and Liz speed toward a final confrontation with Six Kingdoms—neither knowing their paths are fated to collide. And in the frozen north looms a greater darkness yet: An old foe, still nursing thousand-year-old scars, will finally make their move...