"Martial Arts True Immortals actually built a city in the sky?"
Gu Shanhai casually killed this middle-aged man named Bai Fen. He obtained quite a bit of information about Heavenly City from the man's memories.
In Heavenly City, ruled by the Martial Pavilion assembled by the Martial Arts True Immortals, the population was numerous, at least several hundred thousand.
Moreover, Gu Shanhai realized he had misjudged—this Bai Fen was not just any martial progeny; he was from a lineage of many generations of martial practitioners and even claimed to be a Heavenly Person, meaning they were no longer mortals.
Because in Heavenly City, some sparse Spiritual Energy dispersed, allowing for the practice of powerful ancient Martial Arts, which bestowed them with the capital to look down on the Mortal World.
In an environment with Spiritual Energy, the offspring produced possessed even better natural talent, hence their increased arrogance.