Vicious Vengeful Slipcase, Paperback Book, by V.E. Schwab

Ten years after they turned on each other, Victor has escaped from prison and wants revenge on the man who put him there. Eli is hunting down and killing every EO he can find, convinced that they are a crime against God. All except his sidekick, a woman whose power is persuasion and whom he cannot defy. Armed with terrible power on both sides, driven by the memory of betrayal and loss, the arch-nemeses have set a course for revenge.