Although the mysterious objects are incredibly powerful, they have a usage limit, and they will immediately break once that limit is reached. It is because the shattered rules from the Upper Realm are very powerful, but they are also strictly limited in this world. The sealing structure not only protects these "broken rules" but also withstands the damage caused by the mysterious objects when they exert their power.
When the sealing structure is completely destroyed, the shattered rules of the Upper Realm are exposed, and the mysterious objects break down.
It is precisely because of the incomplete rules that the Sunset Nail is deadly against Tier-6, but it cannot cause any substantial harm once it reaches Tier-7.
