Keeper of the Mythos Gate — Kay Kenyon

The powerful conclusion to the four-book series! Yevliesza is no longer alone. In her adopted land, people call her their savior. For a vast army of demonic engines is massing and, in the crossings between the worlds, only Yevliesza can stop them. Amid this vital mission, her heart still belongs to Valenty, who has sworn to find her again across a chasm of war and duty. But she has a dilemma. If she uses her rare power to block the invaders at the Gates, she risks bringing the arisen worlds to ruin. Her only hope is to unlock the deeper secrets of the Mythos crossings. She has no time to lose. The sorceress Nashavety is coming home. Accompanying an army of conquest, she will wield an immense and ancient magic—a legacy of the origin world, Earth. For ages, that power has rested in fitful sleep. Soon it will awaken.           In its path, the girl with the lost power.