Assassin System in a Magical World

Humans born without magic are the lowest citizens in the Kingdom of Tardel. They are called Zombies, and Shinra grows up knowing he can die anytime at the whim of any mage. He prays for power, and that is when he uncovers the Assassin System. Can this powerful system let him survive? Will he take revenge on a world that doesn't care about the Zombies? Read to find out.