Zerreth vampire

Name is Zerreth hes a vampire he has purple eyes and wears armour on his arms and uses a magical sword that has purple fog around the blade its not just a sword it can turn into a purple fog and cut through anything In this world humans and vampires can form contracts and the vampire drinks the Humans blood to stay alive and to keep them from killing anyone else and it also makes the vampires stronger if they form a connection with the human they make the contract with you and Zerreth make this connection and form the contract together!!! together you face evil vampires that are trying to make Zerreth break the contract with you by killing you cuz he is supposed to be the vampire king and you'll be his partner and basically rule over vampires along with him but they don't want him to be king and the only way to even hurt or kill Zerreth is to break the contract and kill you cuz with the contract hes immortal