Every Gu refinement method was something that a Gu master had painstakingly researched.
It was difficult to learn, but it was not difficult to change.
As long as one analyzed the elemental composition of the material and changed the information accordingly, one could basically determine how the Gu would turn out.
"This thing contains fire elements. If more is used, the Gu worm will go berserk and lose its mind, and the dosage will be increased..."
"This can cause the Gu worm to have a hallucinatory reaction. It doesn't seem to have any effect. Forget it, let's change the dosage too."
"This… hmm? Can it make the Gu worm have a paralyzing ability? This is good, this is good. I'll put more of it. It's best if Zhang Wenbin cannot move it for the rest of his life!"
After fiddling around, Fang Yuan wrote down the part of the modified technique on another piece of paper and handed it to Bai Yao.