The power of Tuo Shi.
Aside from the Forbidden Land, this is another secret of Tuo Shi.
In the core region of Tuo Shi, there indeed exists a mysterious force that envelops the core area. As long as training is conducted within this area, the constitution can undergo significant changes.
If one reaches a certain realm, they can even clearly perceive the energy changes within their body, similar to Spiritual Energy and Inner Strength.
However, concerning the origins of this force and how to define it, even Elder Wu and Yin Zhengyuan can't make clear sense of it.
Legend has it that there is an even more powerful existence in Tuo Shi, who is actually the highest ruler of Tuo Shi. In fact, this is not just a legend but a reality.
The cave where that person resides is extremely hidden. As for whether he is still alive now, it remains uncertain, but where he is, there are definitely many secrets related to Tuo Shi.
