Cultivators could cultivate anywhere in the starry sky, because Starry Sky Energy was everywhere. It was simply that the efficiency was incredibly, incredibly low.
Just like cultivators of the Nine Provinces: they could cultivate anywhere within the Nine Provinces, but hardly anyone actually did so. Even Spirit Stream Realm cultivators knew to head for the Spirit Stream Battlefield...
The cultivation environment on this reef island was better than that of the ordinary starry sky. Cultivators who were not particularly demanding about their cultivation environment could absolutely cultivate here. The efficiency was naturally rather unsatisfactory—not as good as using Lingyu, much less swallowing Spiritual Pills—but it was a business requiring no capital.
Yet basically no one did this, because it was too unsafe. People were constantly flying back and forth overhead; who could cultivate with peace of mind? Especially since cultivators normally had to guard their minds closely while cultivating, making them highly vulnerable to sneak attacks.
Of course, there was no need to worry about this if one was within a Spirit Island occupied by one of the major factions.
Fang Wanli, the ferryman, had said that the Starry Sky Energy on some Spirit Islands was exceptionally dense, fully capable of meeting the cultivation needs of Star Constellation cultivators. If someone could occupy such a Spirit Island, they could save a great deal on cultivation resources alone.
And there were quite a few such Spirit Islands in the Myriad Phenomena Sea.
This was one reason why all sides were so keen to fight over ownership of Spirit Islands. To them, a Spirit Island was not merely a place to gain a foothold; it was itself a cultivation resource!
There was another, even more important reason: Spirit Islands contained Spirit Jade Veins. That was what made the factions of the Four