Demon’s Advocate by Stacia Stark

Lucifer Morningstar took everything from me.

My memories. My freedom. And my powers.
Now, it’s my turn to take everything from him.
I’ll make alliances with former enemies, kill those who betrayed me and make my grandfather regret ever learning of my existence.
Because Samael is readying our people for war. And there’s nothing I wouldn’t do to protect those I love.
The Underking thought he could hold me prisoner in his castle. He’s about to learn that he shouldn’t have let me into his world. Because now I’m going to burn that world down.
Even if it means I burn with him.