As Zhong Shenxiu returned to the damp forest, Ni and Robin had already caught several fish, all plump and sizable. Clearly fond of the activity, the two still stared intently at the bobbers on the water with undiminished enthusiasm.

"Master, you're back!" Robin turned around, flashing Zhong Shenxiu a sweet smile.

Zhong Shenxiu nodded, not wishing to disturb their mood, and sat to the side to observe. Though observing, he was actually deep in thought. He was currently pondering what kind of medicine to concoct to solve the problem of the 'Lich fearing sunlight.'

He already had an idea, and now he was merely re-examining it. After a period of careful deliberation, a smile reappeared at the corner of Zhong Shenxiu's mouth. Clearly, he had found a definite answer!

At noon, while Kaini and Robin busied themselves stewing the fish, Zhong Shenxiu sat nearby, whittling a piece of wood, much to everyone's puzzlement!

As wood shavings continuously fell from Zhong Shenxiu's hands, the general outline of the wood began to emerge—it was a mold. A mold shaped like a small bottle!

Since he had decided to manufacture medicine, and planned to sell it, a container was naturally necessary.

While bamboo tubes could be used for storage, they were sufficient for small quantities; for larger amounts, they would become troublesome. Moreover, finding enough bamboo was difficult, and more importantly, the varying sizes of the bamboo made it hard to establish a standard specification!

But if he first made a model, and then used it to fire identically sized small bottles from clay, the process would appear much more efficient and standardized!

Soon, two exquisite models were completed. Although the carvings on these two models were identical, their sizes differed greatly. One was small enough for only three fingers, while the other was as large as a wine bottle.

The two sizes existed because they were intended to hold two different types of medicinal preparations.

By this time, the aroma of fish had drifted over. Zhong Shenxiu looked up; Kaini and Robin were now keenly savoring the fish soup from the pot.

A trace of serenity crossed Zhong Shenxiu's face. He summoned several pieces of ore and refined them with the Samadhi True Fire into two discs that were 'as smooth as ice.' Then, Zhong Shenxiu became busy again, surprisingly attaching a base to each disc, and embedding a miniature formation that caused the discs to rotate at a steady speed.

These were specifically refined for Kaini and Robin; they weren't powerful items, but if one had to categorize them, they could be seen as toys. Since Zhong Shenxiu was about to fire the bottles, these rotating discs would allow Kaini and Robin to shape jars and pots, serving as a diversion for the two girls.

After the meal, Zhong Shenxiu taught Kaini and Robin how to use the two discs he had just refined. It wasn't difficult; one only needed to place the clay on top and gently shape it with their hands to easily create a uniformly shaped jar or bottle!

Neither Kaini nor Robin had ever played with anything like this, and they immediately showed intense interest.

To find suitable clay for firing the jars and bottles, Zhong Shenxiu and the others walked for over an hour before locating it! Thanks to the 'Storage Bracelet,' Zhong Shenxiu and his companions gathered so much of this soil that they dug a large, deep pit right there on the spot!

Next came the exciting part. Kaini and Robin were extremely proactive, taking the initiative to fetch water from the river.

After a demonstration from Zhong Shenxiu, Kaini and Robin quickly mastered the method for making jars and bottles. They played there with immense delight, occasionally comparing whose work was better!

Even though both of their clothes and faces were covered in mud and water, they were still smiling radiantly!

Meanwhile, Zhong Shenxiu was constructing the kiln. With his abilities, this was not difficult. It didn't take long; a five-square-meter kiln was erected!

Subsequently, Zhong Shenxiu joined the 'Great Mud-Playing Battle,' starting to use his two models to create one small bottle after another.

After the three had busied themselves for a spell, it was time for the most crucial step—firing the kiln!

Kaini and Robin fed firewood by the furnace, while Zhong Shenxiu monitored the heat. The three remained busy until late into the night before retiring.

However, this did not mean their creations were finished firing; they still required a night of temperature filtering!

The next day, Kaini and Robin awoke unusually early and rushed straight to the kiln, their faces full of anticipation.

When the kiln door was opened, a wave of heat rushed out.

Under normal procedures, one would have to wait for the interior to cool completely before entering to remove the contents! But Zhong Shenxiu was protected by Spiritual Qi; never mind a small wave of heat, even a sea of fire could not harm him.

This firing was largely successful, with only a few pieces damaged. Kaini and Robin gazed at the jars and bottles they had made, their faces alight with excitement, fully experiencing the glory of 'labor being honorable'!

Next was the refining of the medicine. Robin, having received Zhong Shenxiu's true teachings, was now a capable assistant!

Soon, Zhong Shenxiu and Robin refined batch after batch of pills.

These pills were quite strange, entirely black, and it was hard to believe, just by looking at them, that they were the cure for the Lich's fear of sunlight!

For this pill, Zhong Shenxiu gave it a simple and easy-to-understand name: Sunblock Pill!

It must be noted that this 'Sunblock Pill' had limited efficacy; one pill only provided a single day of sun protection!

From this, one could see that Zhong Shenxiu possessed a certain business acumen; to walk under the sun for an extended period, one would have to continuously purchase his 'Sunblock Pills.'

This effectively prevented market saturation of the product, thereby maximizing economic benefits!

While Zhong Shenxiu and Robin were refining the pills, Kaini was not idle. Her primary task was to load the pills into the slightly smaller bottles Zhong Shenxiu had fired, placing exactly thirty pills in each bottle!

Following this, Zhong Shenxiu began refining another medicinal preparation: Skin-Cleansing Cream!

As the name suggested, its function was to remove scars, activate cells, promote metabolism, and restore perfect skin, among other benefits!

Its method of use was: take a small, appropriate amount, apply it to the area needing improvement, gently massage it in, and then wash it off with clean water.

This medicine took a three-day course, with visible results in seven days! Furthermore, it had absolutely no side effects, contained no additives, was suitable for all skin types, safe for all ages, and easy to use!

This 'Skin-Cleansing Cream' was no longer limited to Liches; anyone could use it, and the results were the same!

However, like the 'Sunblock Pill' above, this medicine was not perfect. Of course, Zhong Shenxiu did this intentionally!

This 'Skin-Cleansing Cream' also had its drawback: if use of the product was stopped for half a month, a rebound effect would occur.

These 'Skin-Cleansing Creams' were stored in the slightly larger bottles.

This time, Zhong Shenxiu did not intend to refine too much; he wanted to introduce these into the market first to gauge the reaction, and if it was positive, he would consider mass production!

The day passed in this manner, fully utilized!

The next day, Zhong Shenxiu performed the 'Meridian Cleansing and Marrow Washing' on Kaini as usual, and also opened her Ren and Du meridians for her!

Nourished by the spiritual medicine and infused with Zhong Shenxiu's Spiritual Qi, Kaini's internal power was already quite formidable, though she had yet to master this strength completely!

Thus, another ten days passed, and Kaini's meridian cleansing was finally complete. Kaini was now completely transformed; her crystal-clear skin invited endless imagination, and her overall aura was both charming and transcendent!

Regarding the control of internal power, Kaini had become completely adept, and her study of the 'Jade Maiden Heart Sutra' had reached a minor level of mastery. She was now undeniably an expert; unless she encountered someone at the Sword God level, no one could harm her in her current state!

However, this was still far from Zhong Shenxiu's expectations. According to his requirements, she needed to be able to single-handedly fight five or six Sword Gods simultaneously.

In Zhong Shenxiu's eyes, Kaini's strength was still too weak; what she lacked most was practical combat experience!

For this reason, Zhong Shenxiu tasked Robin with sparring with Kaini every day. Robin took this duty very seriously, gauging his strength with extreme precision; without harming Kaini, he constantly pushed her to the brink, allowing her to grasp the true essence of martial arts amidst desperation!

Several more days passed swiftly, and Kaini's progress was astonishingly fast. By her current strength, she could now easily dispatch two or three Sword Gods!

Seeing that Kaini had completed her initial adjustment phase, Zhong Shenxiu felt it was time to teach her some more formidable ultimate moves, so he summoned Kaini over.

"I have something for you!" Zhong Shenxiu said, looking into Kaini's eyes.

Kaini smiled softly, not asking what it was, and sat down beside Zhong Shenxiu.

As if performing magic, Zhong Shenxiu produced a box in his hand and offered it to Kaini.

Kaini carefully opened the box and gasped—inside were several extremely fine strands!

Then Zhong Shenxiu spoke, "I used the 'Heavenly King Sister Silk' to refine a weapon for you. It is called 'The Invisible'! First, drip your blood to acknowledge it as master. Later, I will teach you how to use it."

Kaini complied. When a drop of her blood touched the fine silk, several faint rainbow lights flashed across it, vanishing in an instant. Then, the fine strands bizarrely floated up on their own, and one end drilled directly into Kaini's palm.

Subsequently, a sensation of flesh and blood connection immediately arose. Kaini instantly felt that she could drive these fine strands at will with just a thought; the silk seemed to have become her invisible hand!

"Now try retracting these fine strands back into your body!" Zhong Shenxiu suddenly commanded.

Kaini nodded, focusing her will. As if receiving an order, the fine strands zipped back into her body with a whoosh.

Immediately, Kaini's body trembled distinctly; she had gained a certain understanding of the various capabilities of these fine strands!