After the gu insects underwent their initial fusion, they still had to be nurtured inside the "primary material" for eighty-one days before a Brain-Entangling Silver Corpse Gu might take shape. Even then, it was only a possibility.
Once that stage was reached, the half-pill of Garment-Rending Pill fed to the cultivator beforehand would play a crucial role.
It was precisely because of this pill that the Brain-Entangling Corpse Gu could not fully fuse with the host, leaving the host's flesh to serve merely as "soil" for its cultivation.
Otherwise, even if a Brain-Entangling Silver Corpse Gu was successfully cultivated, extracting it afterward would be extremely difficult. Such a result could only count as half a success, since the flexibility of deploying the gu would be lost.
And if implanting the Brain-Entangling Corpse Gu into the cultivators nurturing the materials inside their bodies failed, the outcome needed no explanation: they would die along with the gu.
Under the effects of the various medicines, however, these cultivators' bodies would not explode. Instead, their souls would scatter, and they would simply die...
When Li Yan uncovered these memories, he hesitated and gave the matter some thought. The other materials needed to cultivate the Brain-Entangling Silver Corpse Gu were one thing.
But using other living cultivators as "materials" went against the Heavenly Dao. Once Li Yan uncovered these people's origins, however, those reservations quickly faded, and he no longer felt it mattered.
The people recruited by Huiyan Hall came from every conceivable background. The hall did not necessarily require high cultivation; rather, those it recruited needed a particular field in which they excelled.
Thus, no matter who someone was, they could be recruited as long as they met its requirements—like the demonic couple Li Yan had encountered on the Rouge Sea.
Those two were