The Immortal of Plague begins by establishing the root of lung fire.

"Okay, senior brother, there's one more thing. Senior brother Jiang asked me to give this to you." Shen Lu took out a two-page list.

Song You took the list. The first one listed a series of medicinal food pouches for exchange. After completing the pharmacy's tasks, one could exchange the medicinal food pouches on the list for major and minor merits from the pharmacy.

The ingredients for these medicinal dishes were all from his own quota. It was written that Song You, as an elder disciple, had the highest quota in the pharmacy. As a beginner, he already had twice the quota of Jiang Yangge, and was able to make two batches of fifth-grade mid-quality medicinal dishes.

Song You flipped to the second page of the list, which listed the items that could be exchanged for merit points. They were all items from the pharmacy: medicine furnaces, medicinal herbs and leather, fifth-grade medicine prescriptions, and some miscellaneous items. The three-tiered censer at the top of the medicine furnace had been crossed out, clearly the one in Song You's hand, which required a full five major merit points.

Staring at the two pages of paper, he did some mental calculations. The pharmacy disciples could exchange their quotas for medicinal herbs, make them into medicinal food pouches, exchange them for merit points, and then exchange them for more medicinal herbs. As long as they were skilled, there would be a difference in merit points that the disciples could freely use.

It seems that Po Cang Temple also knows to offer some benefits to its disciples. However, after Song You searched carefully, he did not find any techniques available for exchange. This means that the exchange lists for disciples in different places are different. For example, disciples stationed abroad like Ruan Yingying can exchange for techniques.

Song You continued reading and saw a familiar name: Bai Mulan Gen was also on the list. As a medicinal dish that could be brewed to help one break through to the mid-stage of the Firewood Realm, it was worth one Great Merit. In the previous list, three hundred portions of the fifth-grade low-level Qingfei Powder could only be exchanged for one Small Merit, and fifteen Small Merits could only be exchanged for one Great Merit.

The other medicinal ingredients in the medicinal diet, including the jade fruit, are worth one major merit, while the Winter Return Medicine Pouch can be exchanged for sixteen minor merits. Considering the price difference offered by the temple, Brother Jiang's transaction was reasonable.

Feeling that Bai Mulangen was still on his body, Song You felt much more at ease. He was still some distance away from the mid-stage of the Firewood Realm and had enough time to gather the necessary medicinal herbs. Moreover, he had the opportunity to break through to the mid-stage and might not necessarily need medicinal cuisine.

Originally thinking there was nothing to exchange for, Song You casually looked down, when suddenly something caught his attention.

There is a formula called the Concentration Medicine Pouch. The name is very simple and clear, but its effect is very powerful. When a disciple wears the medicine pouch, he or she can increase his or her concentration by 20-30%.

Most importantly, this recipe only requires three minor skills, which is obviously intended to improve the efficiency of disciples, and even the author has the opportunity to exchange for it.

If I obtain the Mind-Concentrating Medicine Pouch, I can not only improve my efficiency in the pharmacy, but also recover my Three-Inch Outer Flame more quickly, and even advance further, as the cultivation of Lung Fire Technique requires extremely strong willpower.

Having clarified his thoughts and set this item as his target, Song You put away the list and looked at Shen Lu, who was still standing to the side: "Was this list recently issued? Where is Senior Brother Jiang?"

"It did take two days to arrive," Shen Lu confirmed. "Senior Brother Jiang is injured again, so he'll be arriving later these next few days."

Jiang Yangge is injured again. Last time, the other party was also suddenly injured at the disciple's residence. Considering that he has been planning the mid-stage of the firewood project recently, this exchange is an opportunity, which is not incomprehensible.

Song You swallowed his doubts. The coal was already radiating heat. "Alright, go to the inner courtyard and get the ingredients for five portions of Lung-Clearing Powder."

"Okay, senior brother." Shen Lu left for the outer courtyard.

Song You looked at the medicine furnace and pondered. Ruan Yingying's words should be true; the other party really could exchange techniques. However, the other party was not friendly, and his primary task now was to improve his medicinal cuisine and medicine bag techniques, so he naturally did not need to pay attention to the other party for the time being.

Ruan Yingying might be harassing him elsewhere, which made Song You consider staying at the pharmacy. It's not advisable to cause any trouble during this time. Jia Chunfang is often not at the pharmacy, so it won't interfere with his time to replenish his nutrition.

Shen Lu had already returned by then. Song You took the materials and prepared, saying, "I will brew several more batches of Lung-Clearing Powder. When that time comes, you can make connections with some disciples using the same method as before."

Song You called out to Shen Lu, who was about to leave: "Now that you have more free time, you should cultivate more. Cultivation is the foundation."

Shen Lu pursed her lips and nodded, saying with a slight smile, "Thank you for your concern, Senior Brother. I have recently stabilized my outer flame by half an inch and am preparing to continue my cultivation."

"That's good." After completing the preparations, Song You began to brew the medicine.

Seeing that Song You had become focused, Shen Lu quietly withdrew and closed the door. She looked back at Song You's room and was surprised that Song You, who had entered the school at the same time, had already achieved this. She wondered if she herself had a chance to defy fate.

I don't want to think about that too much. Before that, I'll focus on my cultivation and keep up with my senior brother.

The room fell completely silent, leaving only Song You. Song You let out a long breath, picked up the snake-shaped grass, and began to meditate.

The medicine furnace has three layers. Song You inserted the snake-eating grass into the top layer to preheat it. He had previously learned from his mistakes and used the method of heating it from the top to create a simmering effect. However, once the yellow coal heated up, the temperature was difficult to control, resulting in significant differences in the transformation of the snake-eating grass. This time, he could try it from low to high.

Just like last time, after feeling hot and stuffy, Song You extended a wisp of his lung flame to touch the snake-eating grass, removing the toxins little by little. He could feel that the toxins were very sticky, indicating that the heat on the upper layer was not enough to work with.

Upon learning this, Song You immediately moved all the snake-eating grass to the middle layer. He could clearly feel a temperature difference between the middle and upper layers. Unlike ordinary medicine furnaces where the temperature gradually changes from high to low, the temperature was directly isolated, making it easier to remove the toxins.

With the snake-eating grass toxin removed, Song You relaxed. Suddenly, he noticed a mechanism on each layer of the medicine furnace and wondered about its function.

After pressing the upper mechanism down, Song You was surprised to find that the temperature on the upper level dropped directly. He continued to press the mechanism, and the temperature stopped changing after it dropped to a certain level.

A thought struck Song You, and he adjusted the temperature of the middle layer's mechanism. The temperature continued to rise until it reached the same temperature as the upper layer, at which point it stopped changing.

As expected, this medicine furnace can evenly divide the heat emitted by the yellow coal into three layers, and each layer can be adjusted within a corresponding range. This function is tailor-made for pharmacists.

"Not bad, not bad."

The snake-eating grass in the middle layer was ruined due to the recent incident, but Song You didn't care at all. Compared to this loss, he was more delighted to discover the new ability of the medicine furnace.

No wonder this medicine furnace is worth five great merits; this function alone would make the pharmacy disciples fight tooth and nail for it. Song You put down the snake-carrying grass and examined the medicine furnace carefully, trying to find other hidden functions, but unfortunately, he didn't.

Song You calmed himself down and told himself that it was already good to have found an unexpected joy, and he shouldn't be upset about what he didn't get.

After calming down, Song You began to refine the snake-eating grass again, adjusting the mechanism in the middle layer of the medicine furnace to find the optimal temperature. The subsequent steps were the same.

Song You was originally an outstanding medical student from a prestigious university. His strengths lay in mastering skills and pharmacological knowledge. With the help of the medicine furnace, the decoction went very smoothly this time.

Finally, half an hour later, the new lung-clearing powder was ready, and Song You pulled out a piece of cloth to wrap it up.

Just as Song You was relaxing, a familiar voice came from outside the door.