Crown of the Dunes by S.C. Grayson

War brought them together. Forging peace could tear them apart.

Back in Kelvadan after narrowly escaping death, former exile Keera is now hailed as a hero for protecting the Great City against the lord of the clans. Forced to lie low as her injuries heal, she discovers the city’s position is more precarious than ever. Now, she faces an impossible choice: betray the city that offered her a home, or be the Champion Kelvadan needs. Worst of all, the enemy forces are led by the man to whom she has given her heart.
After spending his life running from his destiny, Erix finds himself thrust into leadership after the death of his cruel mentor. With the clans of the desert at his command and Keera ripped from his grasp, he wants nothing more than to march on the city that took her—but the desert has other plans. As the Ballan Desert continues to punish those who fractured her magic, sowing division among the clans, Erix desperately seeks to restore the dunes he swore to serve and exact revenge on those who stole Keera away.
Left to navigate ever-changing sands and even more quickly shifting alliances, Erix and Keera must fight to find their way back to each other, even when the desert seems determined to keep them apart.