Maker's curse - Trudi Canavan (Millennium's Rule #4)

Unforgettable magic. Treacherous villainy. Deadly intrigue. Rielle and Tyen return to face their most thrilling adventure yet in the final novel of international bestselling author Trudi Canavan’s Millennium’s Rule series. Rielle is the Maker, restorer of worlds. She has lost count of the number of worlds she has been sent to save. Tyen has one old friend left, and no longer a spy, he now attempts to teach new sorcerers and find ways to counteract the war machines that are spreading throughout the worlds. But when an old enemy brings news of a threat unlike anything the worlds have faced before — something far darker than magically dead worlds and dangerous sorcerers — Rielle and Tyen must reunite if they are to have any chance of saving humanity.