Within the Blue Star World, once Fang You had acquired greater authority through Sublimation, he had the power to block outsiders from entering based on his own will.
But he didn't.
Because Blue Star needed to trade with these Great Oases, and currently the only way was through the Oasis people entering Blue Star World via the Descending Ceremony.
If they didn't use the Descending Ceremony and relied merely on traveling by foot, not only would the journey be extremely long, but it was also easy to get lost in the vast Grey Mist. Even Triple or Double Awakeners would find the task impossible.
Through trades, Blue Star had acquired numerous materials difficult to obtain in the shallower layers, as well as a plethora of low to mid-tier items from the Era of Mysteries.
One example was the Memory Crystal capable of recording images.
