Due to the fact that the Taoist Ancestor only established a transmission system within the Galaxy, areas outside the Galaxy were collectively referred to by Cultivators as the Endless Outer Domain.
Many high-level cultivator families, as their power and realms improved, continuously expanded into the deeper cosmos outside the domain to search for more Spirit Mines.
With the discovery and mining of more top-grade and superior Spirit Mines, people from level 7 Cultivation Families began continuously venturing into the outer domain.
As long as the Spirit Mines were exhausted, they would expand further in search of new Spirit Mine planets.
Over the past ten thousand years, these Cultivators had expanded their territory to encompass an area nearly ten times the size of the Galaxy.
This also expanded Gu Feng's Divine Sense domain by more than tenfold.
However, these top-tier families did not give up any Galactic territories as transit points for nurturing their clansmen.