The ability to control Heaven and Earth Spiritual Energy is related to the size of a Martial Artist's own Small World.
The larger the Small World, the greater the range of control and the stronger the intensity.
Any Martial Artist, just after breaking through to the Mysterious Profundity Realm, has a Small World that is twice the size of their Qi Spring.
After that, the Qi Spring size is fixed and never changes.
However, the Small World will expand as the Martial Artist's Cultivation rises.
Consequently, as a Martial Artist's Cultivation increases, the larger the Small World becomes, and the stronger their future capabilities.
Xiao Yi had just made a breakthrough and was not in a hurry to leave.
Instead, he continued to return to the cave to diligently practice and stabilize his Cultivation.
Several days later, he left the cave again.
By then, his Cultivation had completely stabilized, and the previously depleted Qi Spring inside his body had filled by one-tenth.