A Mourning Light. The Chronicles of Ethenor, #5

The timeline was rewritten to save them. Now the people Alexander sacrificed everything for are beginning to remember-and something else survived. Months after Emperor Alexander Soterios rewrote history to prevent the Djinn's victory, Ethenor is alive, expanding, and more fragile than anyone realizes. Alexander alone remembers the world that died: the friends he watched fall, the future he destroyed, and the love with Faelan he surrendered so everyone else could live.
Trying to build a life beyond crowns, war, and impossible duty, Alexander grows closer to Gideon, a young knight who sees the man beneath the emperor. But the past refuses to stay buried. Lost memories begin returning. Old loves pull across fractured timelines. Lucas searches for answers in a Fairy Realm severed from reality, while Faelan is forced to confront what Alexander chose for him, and what their bond still means.
Then Ethenor discovers that rewriting time did not destroy the Djinn completely. An echo remains: patient, intelligent, and determined to turn grief into a weapon. As corruption spreads from within the empire and reaches toward the last dragon, Alexander and his found family must face a threat that cannot be defeated by strength alone. Every victory carries a cost. Every relationship is tested. And survival will require them to do something harder than fight:Mourn what they have lost without surrendering the future they still have.
This is book 5 of the Chronicles of Ethenor. Saving the world was only the beginning. Now they must discover whether love can survive the memories of the world that was lost, and whether hope can endure what comes after victory.