The Crown of Shattered Souls (Weapon of Fire and Ash Book 4) by Brittany Matsen
What if the monsters you face…
are inside yourself?
The war has ended, but the threat to Earth is far from extinguished. With Levaroth and Adrianna forced to help Emma find her way back to her humanity, Sheol’s ruin spreads. Topside, Blaze and his motley crew of allies face the consequences left behind from the war. Their only hope is to trust in the creatures that turned their back on humankind while the Shediem destroyed Earth–angels.
In this epic conclusion to the Weapon of Fire and Ash series, bonds are tested, new friendships forged, and the ultimate darkness threatens to kill them all. Have far will those that care for Emma go to save her? And what is the cost of trading your humanity for peace that never comes?