Primordial World.
After the establishment of the Demon Clan Heavenly Court, the rules of Heaven and Earth gradually became perfected.
As Primordial Beings cultivated to a certain level, they needed to undergo the trials of Heaven and Earth.
Those who passed increased their cultivation;
Those who didn't, the lighter cases resolved into soldiers, the heavier cases resulted in the death of the body and the vanishing of the Dao.
The change in the rules of Heaven and Earth was not very good for beings with poor aptitudes and subpar followings.
But for the vast majority of beings, it was quite friendly!
Survival of the fittest.
The fall of beings with poor aptitudes returned Spiritual Energy to nature, beneficial for the enduring flow of nature's spiritual energy, for providing better cultivation conditions for Primordial Beings, and for the nurturing and breeding of natural treasures.
In summary.
