Thinking about it again, the people of Earth have it easy in terms of cultivating energy and understanding the secrets of the Universe.
Each time when they are leveling up and entering into a different realm, the information would be streamed directly into their minds like they have known about it their entire life.
The people of this world might have all of this achievement after countless of trial and error before it arrived to this current way of cultivating energy
They called it the internal energy skills. And each of these sects or schools of martial arts have different ways of absorbing energy from the world and turning it into an internal energy that suited their needs.
For example, that Poison Palm of Yu Rong, that manic and ferocious energy of Xu Meng and even the bleak feeling of the inertial energy from Feng Xiao.
Azief thought that internal energy practice is quite adaptable.