Xie Ye became proficient at the last step of alchemy because of performing it dozens of times while at the same time, Xie Yang also benefited from creating many pills.
Not only did his memories related to alchemy take a leap out of his inner subconscious and reach the tip of his consciousness, but he also became faster at performing the steps of alchemy.
As a result, he became extremely swift at refining pills.
If it weren't for the fact that he needed to rest to catch his breath as well as to recover his spiritual energy each time after creating a pill, he would have finished creating almost two dozen of breakthrough pills hours ago.
They created the last pill, which Xie Ye put in the jade medicinal bottle.
It had the effect of keeping a pill fresh and maintaining its quality for three months.
Thus, for one-fourth of a year, these pills won't lose their maximum effectiveness.