The Legion of 5 (Demon Lord Book 11)

The Flawless are unmaking reality and Caine Deathwalker, a thirteen-year-old boy, raised by demons, is their chosen prey. With all worlds at stake, he must battle a murderous ifrit and his cronies to become the next heir of the demon clan. So this will happen, the mysterious Legion of 5 kidnaps him to the Underworld for a magical tattoo. Then, ready or not, it's time to kick ass, take names, and maybe get a new girlfriend.