Crowned by Blood

My entire life has been a lie, and even my sire never knew. The truth of my abilities has been hidden from both of us for centuries, but now it's out.
I have the power to kill Cain.
My blood is both the key to fulfilling his dream of subjugating the world, and ensuring his doom. Unfortunately, Immy's second betrayal has fractured my pack, and left me firmly in his clutches.
My thralls will come for me.
Once I'm free, we'll fight to the last breath to ensure that Cain's unnaturally long life comes to an end. Permanently.