In Zhu Wuwan's opinion, these high-level cultivators who had been poisoned by him with Zhu Wuwan's poison basically belonged to him.
After all, Zhu Wuwan's poison had already seeped into their souls. If they wanted to get rid of it, they would have to destroy their entire souls. That would be suicide.
Therefore, Zhu Wuwan's mixed poison would fuse with their bodies for the rest of their lives. Zhu Wuwan could kill them or track them down at any time through Zhu Wuwan's mixed poison.
Under such circumstances, it was equivalent to Zhu Wuwan having an absolute trump card to threaten these high-level cultivators. Indirectly, it was equivalent to Zhu Wuwan controlling these high-level cultivators.