The Void, that is the Endless Void beyond the Jiuzhou World.
Even Nascent Soul Cultivators can't possibly survive long in the Void, for apart from the occasional Void currents, there is simply no Spiritual Qi and air present.
This is one of the reasons why Nascent Soul Cultivators are merely referred to as Land Immortals.
The infant Primordial Spirit of a Nascent Soul cannot bear the cost of traversing the Void.
Only True Immortals can freely traverse the Void, exploring other worlds within it.
Divinity Transformation Cultivators are transitional between the two.
While Divinity Transformation Cultivators cannot cross the Void, they have a strong Primordial Spirit, their Inner World has reached a perfect internal cycle, their bodies are exceptionally powerful, and their Divine Techniques implicitly contain the Great Dao, already holding the capital to traverse the Void.
