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Mental power is like the Power of Faith that has been passed down on the blue planet for ages, an extremely potent force.
If there were enough people, Yang Zhen even believed he could pierce a hole through heaven and earth with a single sword strike, but the limitations of this power were simply too great.
First of all, you need a lot of people, a whole lot of people, each contributing just a bit of mental power; when could enough energy be gathered to contend with the forces of heaven and earth?
Secondly, all these people must willingly donate their mental power, and this was hardly achievable.
Yang Zhen wasn't some grand charlatan capable of gathering the mental power of tens of thousands of practitioners. It was only due to fortunate circumstances and coincidences that he had saved so many lives and, with his own strength, opposed the heavens, slaying Demon Five, sparking such fervor in tens of thousands of people.