What a Big Deal

If he wanted to use Malicious Mortal Gu to replace Joyful Mountain Joyful Intent Immortal Gu, then the quantity of the former had to be enormous.

Fang Yuan needed a great many Malicious Gu—not merely a few hundred. He initially estimated that he needed at least two thousand, activated simultaneously, for the malicious thoughts they produced to barely reach the passing line of being sufficient beneath the Wisdom Halo.

It had to be stressed that all two thousand-plus Malicious Gu had to be rank 5.

Fang Yuan possessed Malicious Gu formulas from Rank 1 through rank 5. Rank 1 through rank 5 Malicious Gu all produced malicious thoughts, with the same effect. The only differences were the number of thoughts produced at once and the vast gap in the amount of primeval essence consumed.

"Refining Gu is not easy. The higher the rank, the harder the refinement. Especially rank 5 Malicious Gu—it has to be refined layer by layer, from Rank 1 to rank 2, then rank 2 to rank 3, and so on. There is no Gu formula that can accomplish it in one stroke. Calculated this way, the success rate is not high, and the materials consumed will be immense."

Fang Yuan initially planned to refine two thousand Malicious Gu first. As for Malicious Gu, he did not need it for the time being. Many joyful thoughts still remained in his mind.

Refining two thousand rank 5 Malicious Gu was undoubtedly a massive, long-term refinement project.

If Fang Yuan had not purchased hairy men and built the second stone nest, relying only on the hairy men of the first stone nest to refine them in their spare time after making Air Sac Gu, then reaching the goal of two thousand Rank 5 Gu would take at least ten