The Crane Moon Cycle - J. C. Snow - Bog

Across wars and worlds, through death and life, in mortal and immortal hearts, the phoenix binding holds.
Aili Fallon is determined to escape her past, and won't let anything get in the way of her training as a combat nurse. But when the woman she loves binds her with blood and disappears in flames, she gambles with her own existence to find her again.
Crossing into a forgotten life and death, Aili is bound by a curse a thousand years in the making. As human wars rage and demons hunt the immortal and defenseless phoenix, Aili and her beloved Liu Chenguang fight to heal the wounds of two lives, with their own hearts and millions of mortal souls at stake.
The Crane Moon Cycle Duology contains the full books of The Phoenix and the Sword and The Shoreless River, a complete epic fantasy of love, loss, and redemption, set in a world of spiritual powers, past lives, and beings of myth and legend. Unexpected, multilayered, and beautifully written, the Crane Moon Cycle is a tale of adventure that crosses centuries and worlds.