Elemental Gate!
Chu Mu was not entirely ignorant about the Elemental Gate. He learned from Chu Tiancheng that the Elemental Gate was a special existence with a sphere of influence only second to the Soul Hall, Soul Pet Palace, and Nightmare Demon Palace. The disciples of the Elemental Gate were spread throughout the various worlds and could often be seen establishing Elemental Cities in some ninth and tenth-level cities.
These so-called "Elemental Cities" were established within other cities and acted as gathering places for Elemental Gate members. They had their independent chains of commerce and organizations, often not subject to the control of the city's lord.