Of course, while achieving results, one must also pay a price. This is the rule by which the world operates.
Kun's price was to guard the lowest levels of Hell, until his power could transcend the entire world.
Clearly, this was a trap that Hell had set for Kun. After all, not everyone was like Sterl—someone who, without any external opportunities, could draw power from the world and transcend it. How could anyone else transcend the world in such a manner?
However, Kun never gave it much thought. He jumped straight into this trap and, even after countless millennia, still hadn't emerged. Not only that, but suppressing Hell required him to absorb the accumulated evil energy of Hell. If that energy were to spread, it would be nearly impossible for life to form in Hell under such chaotic and evil forces.