The cities in the Hell World differ conceptually from those in the present world.
The demon clan's major cities are exceptionally high, broad, and heavy, with one city almost equivalent to a nation.
The entire demon clan, if considered as a whole, resembles more of a grand empire under a city-state system. The Ancient Imperial City sits at the center, making all city-states its subjects.
The transition from "tribes" to "city-states" marks a fundamental change for the demon clan with its hundreds of affiliations and thousands of species.
Although in the human race, it is said that "sounds differ within ten miles, customs differ within a hundred miles," with each having its language and customs, using different countries, sects, and organizations to define everyone's affiliations. But under the identity of the human race, everyone has a collective recognition.
The demon clan, with hundreds of affiliations and thousands of species, does not operate in the same way.
