The Shoreless River. Crane Moon Cycle, #2

Two lives, one death, and a demon's curse. Aili Fallon will never be an ordinary woman again. Immortal, invulnerable to all injury, Aili is tormented by the pain of her two lives, her spirit entrapped in the demonic array. But Liu Chenguang is no ordinary phoenix. She carries her final hope for Aili's healing to the Daxian Republic, into a war where neither mortals nor phoenixes are safe. Demon Zhu Guiren has his own reasons to accompany her, striving with Tainu, the eldest phoenix, to break the great array that holds two million mortal souls, defying the dangers that only he can foresee.
As they draw near the secret of Zhu Guiren's power and Tainu's hidden past, the stakes of their quest grow ever higher. And as the Sorrowful River devours the land, together they will all risk their lives and hearts to break the ancient curse.***The Shoreless River is a slow-burn FF and MM story of love and redemption in a cultivation-inspired fantasy world. It includes war and violence, and themes that may be difficult for some readers.
It completes the story begun in The Phoenix and the Sword, and is followed by the standalone novel in the same world, The Seaglass Blade.