There was no issue with the elixir recipe; the problem must have been in the alchemy techniques.
Chu Feng had refined most of the auxiliary medicines many times and was very familiar with their properties. Only the Corpse Flower was too rare, so he was not well-acquainted with its attributes.
During the refinement, Chu Feng used the Abnormal Fire for precise extraction, eliminating its internal yin energy and evil energy.
This should be the crux of the issue.
"Let's try again; hopefully, it will succeed!" Chu Feng once more took one-fifth of the Corpse Flower.
This time, however, he decided to boldly retain its yin energy and evil nature.
After cleaning the waste residue in the Pill Furnace, Chu Feng composed himself and began anew.
...
A day later, faint aroma of medicine wafted from the Pill Furnace. With a single inhale, his mind shook, and his soul seemed to float, as if trying to escape his body.
