Ken questioned Vivienne again after shoving more paralyzing poison into her throat. He already understood that the elders kept track of the babies' bodies because the immortal had to channel their Immortal Qi into them, and if they didn't know its exact structure, they'd fail for sure. By supplying the immortal with the necessary information, they saved the time needed for research.
"Why do you need an immortal to do that? Can't normal ninth-stage elders do it to babies with normal Qi?"
"No. The babies always died when the elders tried doing it. We assume that there's something special in the Immortal Qi that allows the babies to survive, or at least gives them a shot at surviving."
Ken smiled coldly when he heard her saying openly that the sect was experimenting on babies. It proved his point that righteous sects weren't as good as they claimed to be.
"So your sect has four seeds? I thought seeds were difficult to manufacture."