"The fact you have that power means the original owner betrayed the Rulers": Is this supposed to say Rulers? The other translation I read used Monarch here, which makes more sense, because it's the Shadow Monarch's power and he was fighting the Rulers, and the Monarchs are already enemies of the Rulers so that makes him an enemy to the Monarchs now, too.
Also, what's with the magic gem making the giant monarch hear the words of the rulers? Is that something all the monarchs have, or just this one since he got captured?