This had been mentioned before.
As cultivators' actual levels continued to rise, the greatest defining feature of the [Void Glimpse Realm], a realm above the [Divine Ability Realm], [True Form Realm], and [Heart Domain Realm], was that its practitioners' control over the power of space-time had reached a degree unimaginable to the weak.
To [Void Glimpse Realm cultivators].
The invisible, intangible power of space-time was essentially as natural to them as their own limbs.
They needed no overly complicated maneuvers.
With a mere thought, they could freely wield the power of space-time.
Moreover, because their use of space-time power had already reached a considerably advanced level and was no longer limited to relatively superficial applications.
They could even forcibly influence the power of space-time to permanently or semi-permanently interfere with the structure of space-time, thereby creating all kinds of artificial alternate-dimensional spaces—the so-called [Grotto-Heavens].
Throughout the creation process, those [Grotto-Heavens], owing to differences in their actual degree of completion and primary functions, possessed many rather obvious distinctions.
For example, their actual internal size.
Those large-scale [Grotto-Heavens].
Let alone stuffing a city of a million people inside.
Even fitting an entire nation's population of hundreds of millions into one would not be a problem.
Of course.
Depending on the actual abilities of the creator, whether living things could live normally inside after being placed there was another matter entirely...
A blank-slate [Grotto-Heaven] was really nothing more than an artificial alternate-dimensional space capable of storing things.
It contained no heaven-and-earth spiritual energy, air, microorganisms...
To truly evolve it into a small world capable of housing all kinds of living creatures, its creator still had to expend vast amounts of effort and resources.
Therefore, although many factions possessing [Void Glimpse Realm cultivators] could theoretically create large numbers of [Grotto-Heavens] as logistical bases, in