Born of Blood and Ash by Jennifer L. Armentrout — book slip

Sera is finally free from Kolis and back with her loved ones, but peace is elusive. Haunted by memories of her past, she clings to hope for a future with Nyktos, who loves and accepts every part of her.

As Sera and Nyktos prepare to fight for their realms, they must convince the other Courts to support them against Kolis. Sera's bloodline and a foreboding prophecy reveal that their battle is part of a larger cosmic struggle.

With the Primal of Death growing stronger, Sera and Nyktos face heartbreaking losses and a brewing war among the gods. Can they stop Kolis before he destroys everything?

Fourth in the Flesh and Fire series, set in the Blood and Ash universe.