Glass Immortals novels

"From Brian McClellan, author of The Powder Mage, comes In the Shadow of Lightning, a brand-new epic fantasy where magic is a finite resource--and it's running out. Demir Grappo is an outcast--he fled a life of wealth and power, abandoning his responsibilities as a general, a governor, and a son. Now he will live out his days as a grifter, rootless, and alone. But when his mother is brutally murdered, Demir must return from exile to claim his seat...