Qingtian Star seems to have a special Inner Space. There are quite a few planets with Inner Space in the universe; with this being a Level 8 exploration planet, this isn't unusual.
However, after they exposed the Inner Space of the planet, the exploration level here had to be raised again. Generally speaking, any Inner Space within a planet would usually contain some special items.
Such items are even rarer than the so-called Heavenly Materials and Earthly Treasures.
In some of the Hundred Clans, it's because their home planets possess Inner Space that they prospered.
Some clans obtained transformative items from their planet's Inner Space; some discovered special energy sources inside, and all sorts of things.
But later on, related rumors spread, changing the narrative to say that anything you want can be found in a planet's Inner Space...
That's just something to listen to, usually, the special items in a planet's Inner Space are related to the characteristics of the planet.
