Later, Gu Qingyi also kept those Evil Qi for himself.
And now, don't even mention the Evil Qi extracted from the Mountain Demon; I've already developed Evil Qi from my own killings!
So, use this Evil Qi to grind the Primordial Spirit?
There's an interesting relationship between the blade and the whetstone.
The longer you grind, the sharper the blade becomes!
Meanwhile, the whetstone will gradually be worn down.
In this way, the texture of the Primordial Spirit will be enhanced, and the Evil Qi will be expended!
This is a win-win method.
As for the grinding method, Gu Qingyi actually roughly explained it to Chen Yan.
To describe it simply and brutally:
Taking it head-on!
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There's a skill in traditional martial arts that's quite similar: Iron Sand Palm.
It involves mixing cooked soybeans with iron sand, and martial artists repeatedly thrust their palms into the mixture, grinding the flesh and bones of their hands.
