Although Yu Lie had successfully passed the "Hair Removal and Marrow Cleansing" stage in just three days, he did not immediately leave seclusion.
After undergoing such a transformation, the body not only undergoes a drastic change but also suffers significant damage.
This is inevitable when a Daoist compresses a decade-long transformation process into just a few days.
Without careful recuperation, one's cultivation could be damaged, future progress hindered, or even leave behind lingering health issues.
Fortunately, Yu Lie had not relied on the "Marrow Cleansing Pill" for his transformation.
Instead, he had used a combination of formations, secret techniques, and the rare Black Serpent Fish King to aid his breakthrough.
As a result, the toll on his body was much less severe compared to other Daoist novices.
Moreover, after gaining the fish king's innate abilities, Yu Lie discovered that the black aura enveloping his body was not merely a hardened skin-like armor.