Wen Ren Xuewei's was about half a meter square, just right for planting a small tea tree and storing some personal items.
Chen Mobai's, however, was one cubic meter. The domain could freely expand and contract within this range, large enough to hide a person without any issues.
There were two ways for this Void domain to grow: one was by refining the Power of Void, and the other was through expanding it as a cultivator's realm broke through.
Among these, a breakthrough at a major realm would result in a massive qualitative transformation.
For instance, Chen Mobai currently had one cubic meter, but after Core Formation, his domain would suddenly increase to ten cubic meters.
This unreasonable surge seemed like a principle of spatial laws.
This was why many cultivators with developed domains would try to refine the Power of Void to expand the size of their domain before a realm breakthrough.