Hylaea, the kingdom of dragons, is the most powerful kingdom in the middle world. Their strongest can contend with certain demons, and their kind were the only race that could break through to the Mystic Stage because of how powerful their bodies were.
They had the largest kingdom, spanning half of the continent. They roamed the land in their true forms, their massive dragon forms.
Because of this, everything was huge. Houses, churches, schools, arenas, and the Palace. This didn't mean they were always in their dragon form. It was very common to see the dragon race take on their humanoid form, ranging from convenience to curiosity to comfortability.
One thing that the dragons loved was battle. They believed that the wisest and strongest should rule, and to prove that you're the wisest and strongest, you would need to battle for it.
That is how every Dragon Lord became the ruler of their people.