Immortal by Sue Lynn Tan

To win the God of War’s favour was wise – to fall in love with him would ruin me.

When Liyen ascends the throne of Tianxia she vows to end her kingdom's obligation to the fickle immortals who once protected them.

A dangerous alliance… She must learn their secrets to protect her people, but to do this she will have to forge a tenuous alliance with the one she should fear and mistrust the most: the ruthless God of War. A fight for survival… A treacherous attraction ignites. But dark forces are closing in and to save her people from an unspeakable fate, Liyen must risk everything…even her heart.