Testing Gu with a Furnace Vessel; Fourth Tribulation Complete

After successfully refining every Yin-Yang Gu insect, Fang Shu carefully summarized his experience and continued refining them in the two gu pits.

After more than a month, with both successes and failures, he had refined six pairs of Yin-Yang Gu insects in total.

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They had respectively been modified from the formulas for Yin Corpse Gu and Yang Huo Gu. The former was born through corpses and could control the dead; the latter could stir scorching heat throughout its victim's body, making them dance wildly until death. Once exposed to sunlight, it could even ignite them outright, causing them to burn themselves to death on the spot.

While retaining their original uses, each pair of Gu insects could also entwine with one another.

As the yin and yang energies within their insect bodies clashed, they indeed easily erupted into a blaze of desire, just as recorded in the Register of Strange Gu, and its power was formidable.

Fang Shu had already tested them. The six pairs of Yin-Yang Gu insects he had refined were all of the Fourth Tribulation. Yet the blaze of desire they unleashed possessed the power of a quasi-Fifth Tribulation.

This allowed him to vaguely glimpse the prospect of grasping Fifth Tribulation power ahead of time.

He secretly thought, If I can refine quasi-Fifth Tribulation Yin-Yang Gu, then when their auras clash, the blaze of desire they produce should reach the Fifth Tribulation, shouldn't it?

Further refining and nurturing the Yin-Yang Gu insects was not impossible for him. On the contrary, it was highly possible, with clear traces to follow.

It was just that he could no longer continue