The rapid inheritance of certain techniques.
There are even some techniques, such as Illusion Technique, Body Refining, Thunder Control, and so on, all thoroughly enhanced.
Especially Thunder Control.
Before, it was just a simple act of firing bolts of lightning, but as the nature of thunder and lightning became better understood, the methods changed drastically—even some Earth Immortal Great Powers have already hand-crafted a technique called "Electromagnetic Cannon Sword Skill."
It's hard to describe—many aspects left even Cultivator Shen Yu, who personally pushed all this forward, somewhat dumbfounded.
Of course, aside from the internal development within the Immortal Cultivation Civilization, Cultivator Shen Yu also harvested vast amounts of Gray Mist.
Truly immense amounts!
The population of this world had, at last, been roughly estimated.
A jaw-dropping 173.6 billion people!
And this is just one world.
