The Luo God Clan's headquarters was a city.
Strictly speaking, it was a city within a city.
In the Myriad Heavens, whether families, sects, or any other faction, when choosing a headquarters, generally divided their options into three types.
The first was a city within a city.
The second was an independent city.
The third was occupying a treasure land.
Of these three types, the first and third were extremely common, while the second was relatively rare. And between the first and third, the first was more common, since treasure lands truly were difficult to find.
In short, according to mainstream beliefs—
If there was a treasure land, one had to claim it. At worst, they could build houses around it, or even build directly atop it. A standard treasure land could ensure that a faction flourished without decline under normal development. Even after thousands of years, its lineage would still remain, provided it did not violate the principles above.
Breaking down the information and summing it up—
The key lay in "standard" and "normal development."
A standard treasure land had to possess two characteristics and numerous supplementary functions. In other words, it had to be capable of balancing output values and sustaining development. The former ensured stable production, while the latter ensured the treasure land would not be exhausted through reckless exploitation. As for the supplementary functions, that depended on how the treasure land was developed and used.
Take a simple example.
Magma Valley, chosen as a treasure land by a sect skilled in forging, would first have a clearly defined range of magma fluctuations. It would not suddenly erupt into violent waves because of some unknown change. Second, both its quality and total quantity would be reliably estimated, so it would not dry up due to common causes.