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Watching Demetrius, who had been bound up by the Fluttering Blossom Pavilion guards, Zachary was very interested in Demetrius's experiences, but although he was interested, his curiosity hadn't reached the level where he absolutely had to know.
However, through Demetrius's recent behavior, Zachary at least understood one thing: early in the parasitic infestation, one merely becomes more irritable, but as it progresses to the intermediate stage, the body starts to inexplicably feel cold, and should it reach the advanced stages of infestation, human emotions rapidly fade, leaving only fighting instincts.
These were not the most important discoveries. What mattered most was that once a martial artist had been infested, their cultivation level would be lost, either absorbed by the parasite or due to some other reason. In any case, even martial artists at the Path Entry Realm would completely lose their cultivation if not promptly rid of the parasite.