Upon the apparatus frontier, the last of the luminaries bind the tempests of energy. The fall of an Empire has given rise to an age of alchemy, steam and machines, and a world struggling to rebuild.

. . .It is forty years after the Great War that overthrew an empire, and evil survives in the shadows of complacency. When a former general, Ellaria Moonstone discovers that a powerful being called a Sagean has returned and secretly taken control of the Coalition of Nations, she sends for help.

. . .But her friend Qudin, a luminary, and the only one with the ability to defeat a Sagean, has become obsessed with hunting down lost artifacts of the ancients. On the road to reach Ellaria, her allies are joined by young travelers heading to the university in Adalon. When the luminance emerges in one of them, road companions become apprentices on a treacherous journey where beasts and long dead enemies pursue them at every turn.

. . .The currency of souls is in the balance, and for three aging veterans their only hope to defeat this new Lord of Light, lies buried with the past. With the world on the edge, they find their destinies are entwined with an artifact called the Tempest Stone.