The Wizard World has its own rules, and the Mortal World also has its own regulations.
The Kingdom wins the loyalty of the Great Lords, the Great Lords win the loyalty of the small lords, the small lords win the loyalty of the Knights, and the Knights, as the armed force, are responsible for maintaining the most basic order. This is the full picture of the societal rules of the Mortal World.
This set of rules has operated for hundreds or even thousands of years and forms the core of the entire Mortal World. With this framework, the common people of the Mortal World know whom they should obey, and order is prevented from descending into chaos.
Yet the core of this rule is not simply defined by who has the biggest fists, but rather—
Bloodline supremacy!
The Prince of the King will become the King in the future, the crown of the Grand Duke can only be inherited by the son of the Duke, and the Earl's title must also come from the Earl's legitimate bloodline.