Reigns of Ashes and Aether book_3

Kaelen descends to the surface world—a vibrant, wild realm thought to be dead—and unites the surface factions to bring down the sky-city once and for all.
The Conflict: Vane survives the fall, but his memory core has been altered by surface technology, forcing Kaelen to earn back his trust and love while fighting a two-front war against the High Council