A few days later, Fanshu City.
Fang Yuan was already in the Xu Manor's room, studying the blood refinement method without sleep or rest for several days.
After organizing the contents and knowledge for dozens of hours, he finally came up with a method that combined the Gu Demon Sect and Gu Immortal Sect's core Gu refinement methods.
Of course, this was only the theory, and it had not been put into practice yet.
Next, he had to verify the feasibility of this Gu refinement method, then repeatedly polish and optimize it.
After that, he had to adapt and expand it, so that this method could be applied to various formulas combining Gu worms.
Finally, he had to combine it with the core of the blood refinement method!
Of course, it still needed to be polished and optimized countless times before it could be used.
These few processes did not sound like much, but in reality, it would take more than ten years, or even dozens of years.
