Just like living beings, worlds also have levels of hierarchy.
High-tier worlds not only have stronger Space-Time Barriers, but even the most ordinary materials within them are far superior to those in lower-tier worlds.
This is why even an ordinary herb in a high-tier world can be regarded as a priceless treasure in a lower-tier world.
Furthermore, the different world levels determine the limits of the beings that can inhabit them.
When Sterl was dealing with those strange invaders in Hell, he was once dragged into the Endless Void. There, some worlds were as small as a fist, while others were as vast as continents.
In such a tiny world, like one the size of a fist or a basketball, if Sterl entered, even without doing anything, the terrifying force emanating from him would be enough to tear that world apart.
Worlds of that size were so fragile that, regardless of a deity's presence, even a small legend or a third-class being could rule and dominate that world.
