Tattooed Enforcer by A.C. Wilds

Rodrigo makes a deal with his last breath. He becomes a prison for a dark god in exchange for his immortality. It’s the only way he will see her again once he’s gained control.
Ana is a psychic. Her abilities lead her to the United States after the love of her life dies at the hand of a robber on the streets of Brazil. Heartbroken and torn open, she heals by helping others. Everything is going well until she loses her powers.
Now, back in Brazil, Ana tries to connect with her roots and amend the relationship with her grandmother, Maria Rosa. Except she finds not only her powers, but something much more valuable.
Can Ana and Rodrigo find one another again, or will the gods keep them apart?