That being said, Lu Chuan slept for three full days and nights.
The exhaustion from being drained by Yun Yan, the two instances of bloodletting to activate the altar, and the sleepless ten days of patient treatment and alchemy—though these wouldn't leave any permanent effects on Lu Chuan's body, they marked the first time he had fainted from sheer fatigue since breaking through to the Nascent Soul Realm.
Especially with alchemy, it consumed an extraordinary amount of energy. Not only did he have to continuously sustain the Nine Heavens Profound Fire, but he also had to craft specific elixir pills tailored to different injuries. Even though Lu Chuan took elixirs midway to restore his Spiritual Power, he was still nearly drained dry.
After all, taking a life was far simpler than saving one.