Gods' Battleground by Ella Summers — book slip

Leda Pandora joined the Legion of Angels to gain the powers needed to save her brother. Now, five years later, she's on a mission to save her sister Bella, who has been transformed into a deity-killing weapon by a powerful curse.

To find a cure, Leda ventures into the Veil, a territory ruled by warlords and pirates. Her quest soon escalates into a battle for the fate of the universe, as old enemies resurface and threaten everything she holds dear.

Gods' Battleground is the twelfth book in the Legion of Angels series.