Xu Qingtong stayed in Guan Yu's Alchemy Chamber for half a month. Whenever Guan Yu refined pills, he watched from the side. Once his second senior brother finished, he voiced his questions and asked him to clear up his confusion.
Xu Qingtong gained a great deal during that half month. Not only did he learn much about pill refining from his second senior brother, but he also witnessed the process firsthand.
After bidding his second senior brother farewell and returning to his cave abode, Xu Qingtong did not rush to refine pills. Instead, he carefully reviewed everything he had learned and seen over the past half month.
He was naturally gifted and exceptionally perceptive. With his second senior brother's explanations and demonstrations, he soon wove everything he had learned into a coherent whole.
To be safe, Xu Qingtong decided to first simulate the pill-refining process in his Niwang Palace. Using the Divine Sense manifestation method to simulate pill refining was an entirely new experiment for him. He needed a sufficient understanding of earthfire, the Alchemy Furnace, and medicinal herbs to reproduce both their form and essence.
Xu Qingtong took out the low-grade Alchemy Furnace and set it on the stone table, then took out a spirit stone and activated the earthfire. As he controlled the earthfire to heat the furnace, he observed it closely, sensing the changes within.
Only after a full two hours did Xu Qingtong thoroughly understand the properties of the earthfire and the Alchemy Furnace. He began simulating them in his Niwang Palace.
Two days later, Xu Qingtong let out a long breath, rose from meditation, stood up, stretched his limbs, and walked out of his cave abode in satisfaction.
For those two days, he had simulated the earthfire and Alchemy Furnace in his mind without sleep