A Song of Mountains and Memories - The Splintered Blade Trilogy, #1

An ancient treaty hangs in the balance as monsters wreak havoc. Two realms at war only found peace after agreeing to send a tribute to each other every thousand years. This agreement served them well for eons. until the God of Ruin sends back a tribute and demands a replacement. Saderna has spent her life locked away in her temple. She's the Goddess of Peace, spending her days listening to her petitioners and dreaming of life outside the temple walls.
Freedom from her temple finally comes. at a price. She must travel to the Realm of Ruin through a mortal world. A world filled with monsters, where even gods can die. Henry despises the politics of the Divine Realms-fighting monsters gives him purpose. Tasked with escorting Saderna to the portal, Henry must keep the reason she was locked away from her. No easy task as he begins to fall for the Goddess.
Battling both monsters and their growing attraction will take a strength Henry isn't sure he has. And the secret he keeps about her past? It has the power to break worlds