Beneath The Twisted Trees - Bradley Beaulieu - Paperback

The Song of the Shattered Sands, book 4 of 6 completed series

Sharakhai's enemies see the city as weak and ripe for conquest. 

Çeda, now leader of a band of elite swordswomen, hopes to use the growing chaos to free the ancient, undying king of her people. However, like all those of her tribe, Sehid-Alaz was cursed, turned into an asir: a twisted, miserable creature beholden to the kings of Sharakhai. To truly free him, Çeda must break the chains that bind him. She must undo the asirim's curse.

But there is danger everywhere, as even the gods have begun to take notice of Çeda. Faced with annihilation, she knows the time has come. Çeda has always hidden in the shadows, an assassin in the night, a voice in the dark. 

No longer. 

Now she will lead.

The age of the kings in coming to an end.