the beasts over the crown

After centuries of most demons being imprisoned by the " The Binder " and the end of the Age of Power .Kian, a seventeen-year-old young man, finds himself able to control a massive demon and harness it for his service, after his distinctive blood led him to become a sacrifice. When he thought he had finally saved his life, fate brings him to the royal court to find himself among demons of another kind, demons that revolve around the crown... and the crown only. Driven by interests, they weave conspiracies and deceptions. So what will his fate be when he is forced to become part of the game ? And is he the only one truly capable of controlling the demons ?
And what will happen when the kingdoms of the entire continent are in conflict over this new power, racing to arm themselves with it and harness it to serve their own goals and objectives ?