Knowing that no matter how high one's medical skills are, to diagnose a poison, one must at least know what the poison is.
Clearly, Ye Huan knew about the Hell Soul-Devouring Poison!
"I always thought I was the only one in this world who knew how to formulate the Hell Soul-Devouring Poison. I didn't expect the Martial Emperor to be able to formulate it as well. Is his attainment in medical skills that high?" Ye Huan asked.
Chapter 302