As Wu Long continued to move along the path of Extreme, he wanted to make sure that his soul did not collapse under this in a short time.
The fasting pills that Old Yen have fed him earlier as well as the medicine Wu Long gave him himself contained ingredients used in pills for nourishing and mending the Soul Sea.
He was not a skilled alchemist so he could not properly refine the ingredients, however it was not like he did not have a trick up his sleeve. On their own these medicines would not have much of an effect but when combined they gave off a reaction to each other.
In addition, several formation patterns out of many he set around Nie Changsheng helped Wu Long not only ensure his soul would not collapse, but also precisely monitor soul fluctuations so that he could adjust the level of pain he inflicted just right.
