An Inner World was a Small World constructed within the body. This Small World could not exist independently apart from the human body. Although it could sustain life, it could only rely on the laws of the Universal Divine Realm to maintain its operation. Put plainly, it was a miniature Universal Divine Realm; aside from its size, the spatial laws and temporal laws within were completely identical.
A Storage World was different. From the moment one possessed a Storage Dantian, it evolved step by step, gradually acquiring unique power. It possessed spatial and temporal laws unlike those of any other place, and within these laws, one was the controller, able to alter its attributes at will.
For example, in the Storage World, if he declared that water was heavier than mercury, then it would become far heavier than mercury. No matter how powerful others were, they could not change that law! Even turning water into steel was simple. But an Inner World was different. Even if you were its master, an expert at the Perfected Emperor Realm, you could at most place water within it; it was impossible to alter its properties or capabilities.
This was a gap in the fundamental laws. Even if an Inner World was sturdier and more powerful than his current Storage World, in terms of being able to alter laws at their root, it fell far short.
Having understood this, Nie Yun felt somewhat puzzled. The Storage World was more advanced than an Inner World, and it fit him so perfectly. Did that mean... he already possessed an Emperor Realm domain and had become an Emperor Realm expert?
Though doubt filled his heart, his feet did not stop. After wandering for more than two hours, he had read through every book in the Book Repository