The Duke's family is the only one that has the talent in both magic and swordsmanship. This is why they are called "Monsters". Despite being the loyal subjects of Royal family for centuries The Emperor just think of Duke as a threat. When the Duke Cedric Castillo found a mine of "dragon breath" magic stones the imperial family fell into chaos. The Emperor Ronald Sperdo starts to send Assassins to the Duke mansion but none of them were able to get away. Who would have known that the emperor will be that of a coward that he spend half of his fortune just to block Duke. He Hired 200 great magicians through out the world just to bind the Duke to his mansion. but they can't buy more than 20 minutes. the Emperor slyly send the white dragon knights (Duke's knights) on the battlefield.