The Exile and the Savior by Kris K. Haines

When the rules no longer apply, the only thing left to break is your heart.

Cassandra Fortin is a Shrouded Sister no longer, unshackled from her vows. But she’s struggling to find her purpose outside the Temple. And her feelings for Tristan are more complicated than ever, given his recently revealed secrets.
Tristan Saros’s past has come back to haunt him—guilt-ridden memories of a tragedy that crushed his dreams and nearly cost him his life. And could cost him the future he so desperately wants with Cassandra.
A surprise visit from the Fae Emperor brings deadly new burdens and a new assignment for Tristan and Cassandra. As the pair travel the colonies, enemies emerge wielding long-dead magic while a divine influence threatens to pitch the continent into turmoil–an influence that hints Tristan and Cassandra have larger roles to play in the looming battle for the soul of Ethyrios.
If they can learn to trust each other again.
Though their passion comes easy, unguarding their hearts is another matter. Even as the fate of their world may very well rest upon their combined power.
For when the Exile and the Savior unite, an Empire will tremble.