Ling Feng and Yan Cangtian were both masters of Alchemy, but although Yan Cangtian's eyesight was not as good, his method of Fire Control Alchemy was truly beyond reproach.
Once Ling Feng had helped him choose the correct herbs, Yan Cangtian finally succeeded in refining a "Nine-Revolution Organ Elixir."
However, compared to the one made by Ling Feng, it was obviously inferior.
This was not to say that Yan Cangtian's Alchemy Accomplishment was less than Ling Feng's, but rather that the Primordial Qi within his body often fluctuated highly.
Although Ling Feng had temporarily suppressed the poison in his body using Golden Needle, he still couldn't fully control his own Primordial Qi, at best he wouldn't vanish suddenly, but it still had some effects.
Being able to overcome these effects and even refine the ancient elixirs from the "Medicine King's Scripture" was indeed very impressive.