Age of Auroras by Shari L. Tapscott

Temporary peace has settled across Draegan as a new era begins for the cursed kingdom, but the royals know that tranquility is fleeting. In order to fulfill the magic and save the continent from its imminent destruction, Rhys and Amalia must once again return to Renove and see the rightful king ascend his throne.
The sorrows of yesterday forgotten, Amalia looks forward to crossing the rift one last time to see her family, filled with hope that the impossible task she and Rhys were charged with will soon be complete.
But the happy reunion doesn’t go as planned. The curse has fully descended on the once-blessed kingdom, and an imposter king wears a stolen crown.
Already, the broken magic begins to tear their world apart, and amidst it, an unavoidable battle looms that will test the royals in ways they never dared imagine.