Dragon Country.
It was said that before the primordial era, the Dragon race was the ruler of the world.
According to the legends, unlike the human race's way of ruling the world, the true dragon's bloodline was unable to reproduce without restraint. Therefore, the world under the Dragon race's rule had a strict pyramid-like hierarchy, divided by bloodlines.
The first grade was naturally the pure-blooded true dragon, which was Supreme.
The second class were the mixed-blood Dragon descendants below the pure-blood true dragon. They were mostly reproduced from the dragon clan and other clans, and their bloodline was not pure. The pureness of the bloodline was important to mixed-blood Dragons, and the purer the bloodline, the higher the status.
The third class was the living beings who did not have dragon blood flowing in their bodies.
The human race was unremarkable among them, and they were even at the bottom because of their weak bodies.