The Domination

There was a reason for this. One's lifetime achievement and birth were important, but one's temperament, methods, wisdom, and perseverance were equally important. Those who could climb up from the bottom usually possessed all these traits.

This kind of person could be brilliant as long as he was given a bit of cultivation. With enough resources, he could improve at an astonishing speed. Lu Xuan, for example, was this type of person in his previous life.

The hardships he had experienced in the lower realm universe had all become the soil and nutrients for his rapid rise in the heavenly realm, where he would soon become a celestial lord. 

Therefore, the heavenly court was also very protective of these people, not allowing people from the upper realm to freely descend to the lower realm.