God's End Entrustment!
The powerful beings at the God-Ending Realm, before they lost their consciousness and fell into slumber, entrust a wisp of their soul.
This wisp of soul can no longer improve through cultivation, the only benefit is to experience life, to feel everything about the living beings in the world.
Frankly speaking, this wisp of soul, borrowing the body of an immortal cultivator, feels power, feels the mortal world, feels everything.
During this process, even the immortal cultivator themselves are unaware.
However, for a Heaven and Earth Plane, such an entrustment of the soul would imperceptibly imbue the plane with its essence, turning this plane into one stained with the power of God-Ending.
God-Ending, a place where power collapses and becomes ethereal.
No matter what kind of plane it is, once tainted by this God-Ending power, it will inevitably dissolve into nothingness.