The Binding of Blood by Kelly Limberg

A human prisoner. A sacrifice. Trapped among enemies who can burn away her life, and shadows that can possess her, no choice goes without consequence.

It was a treasure, abandoned.
Nova doesn’t regret her decision to take the pouch—she had every intention of using it for good.
The only thing she regrets is that she shared her plans too soon. An honest mistake that landed her in the women’s wing… serving a twenty year sentence.

The Offering Ceremony is her chance at freedom.
But it is a risk with even deadlier consequences.

Now, her blood binds her to the one known as the Keeper, an Ashlora.
Trapped in a place where shadow spirits possess the living, and supernatural beings burn away human life, she has to find a way out!
If Nova has learned anything from her past mistakes, it is that she needs to keep her plans hidden. Allies must be chosen carefully… It is never easy to know who you can trust—or love.