In the slightly dim but quiet environment of the cave, an inky black medicine cauldron was quietly suspended. All over its body, intricate and strange flame patterns meandered and crisscrossed, like a mysterious ancient totem.

With just a glance, the lines seemed to come alive, and the flames seemed to have intelligence, wriggling slightly and rhythmically, emitting a thrilling vitality, as if they were about to break out of the cauldron and burn everything in the world. As soon as Xiao Yan's eyes touched the medicine cauldron, his eyes froze instantly, his mouth opened slightly, and his Adam's apple rolled subconsciously. He looked like he was almost drooling.

Looking back to the past, when he was young and ignorant, he had just started to learn about alchemy and was fortunate enough to witness Yao Lao summoning this cauldron. But at that time, he was just a young boy who had just started out and had only a limited understanding of alchemy. How could he know the extraordinary and unattainable status of this medicine cauldron in the world of alchemy, and how many legends and glory it carried.

“Black Demon…” Xiao Yan smacked his lips, his eyes full of amazement and envy, muttering to himself, “This is a famous treasure on the Tian Ding Ranking. When will I have the opportunity to get a medicine cauldron of this level?”

As he spoke, he kept looking at the medicine cauldron. The more he looked, the more he felt that the medicine cauldrons he had used in the past were just like shoddy objects compared to this black demon. They were completely not worth mentioning and it was no exaggeration to say that they were discarded like old shoes.

Seeing Xiao Yan's infatuated look with shining eyes, Yao Lao couldn't help laughing. He shook his head helplessly, but his face was full of doting: "You little guy, the spirit tripods on the Heavenly Tripod List have all bred spirituality, which is completely different from ordinary medicine tripods. Besides, this black demon, I have already placed a soul mark on it, and now you can't control it. When I find a body that can accommodate the soul, I will erase the mark. At that time, it can be used as you like."

Xiao Yan scratched his head, a naive smile appeared on his face, and he chuckled twice as a response.

"Okay, don't be distracted anymore, start refining the pills immediately."

Yao Lao stopped smiling, and his expression gradually became solemn and dignified. His solemn expression seemed to be telling the difficulty and key of this refining task. The fact that he was willing to sacrifice this black demon to refine the pill showed that he attached great importance to the Yin-Yang Soul Pill.

Yao Lao's dry and rugged illusory hand, like an eagle's claw, slowly raised and spun gently in the air. In an instant, a cold and pale flame flashed out without warning, and the eerie white light flickered and jumped, like a ghost fire from the Nine Nether Hell.

When the flames appeared, the temperature around them did not rise but dropped sharply, and the coldness spread like a tide.

However, what was strange was that despite the biting cold, the flames seemed to be stimulated by something and began to surge and jump more violently. The fire burned more and more vigorously, forming an extremely strange and counterintuitive scene.

Yao Lao stared at the medicine cauldron with a sharp gaze. He waved his hand suddenly, and the ball of white flame was like a white lightning, instantly disappearing into the medicine cauldron.

In a flash, a raging fire suddenly rose up in the medicine cauldron. The scorching heat and the freezing cold intertwined and collided with each other, making crackling sounds, as if it was a feast of ice and fire, or a contest with the rules of heaven and earth.

And this thrilling journey of refining the sixth-grade Yin-Yang Soul Pill finally officially kicked off with this shocking scene!
Yao Lao looked solemnly at the rapidly rising white flames in the medicine cauldron. Since the quality of the Black Magic Cauldron was extremely extraordinary, the initial step of warming the cauldron took a little longer than that of an ordinary medicine cauldron.

However, with Yao Lao's superb alchemy skills and his superb control over the Bone Spirit Cold Fire, there is naturally a way to cleverly save this time.

So, after the flames rose in the medicine cauldron for nearly a minute, Yao Lao gently waved his hand at the several herbs neatly placed on the ground in front of him. Suddenly, the blue ghost grass, which was dark blue all over and seemed to contain endless deep sea power, slowly floated up and finally fell directly into the medicine cauldron.

As soon as the blue ghost grass entered the medicine cauldron, the dark white flames pounced on it like a hungry wolf, instantly devouring it.

In a flash, the former withered rapidly at a speed visible to the naked eye.

Xiao Yan stared at the medicine cauldron. Although the flames in the cauldron were burning fiercely, he was keenly aware that the flame temperature had been precisely suppressed by Yao Lao to a just right level. Therefore, although the flames seemed fierce, they did not burn the blue ghost grass to ashes. Instead, during the gradual withering process, fine water droplets like dark blue crystals seeped out from the surface of the spirit grass, and finally slid down the surface, suspended above the flames, and kept rolling.

Yao Lao raised his hand and the ice-blue spiritual essence slowly rose up and floated towards the medicine cauldron.

As soon as it entered the cauldron, the Ice Blue Spiritual Essence was tightly wrapped by the Bone Spirit Cold Fire. At first, it tried to struggle, the faint blue light and the white flames competing with each other, but under the strong power of the Bone Spirit Cold Fire, in just a moment, the Ice Blue Spiritual Essence withered at a speed visible to the naked eye, turning into wisps of faint blue medicinal power, swirling in the flames.

Xiao Yan stared at the medicine cauldron intently, secretly admiring Yao Lao's skills. In the past, when he made pills himself, the medicinal materials were directly burned when they were put into the fire, and it was difficult to accurately control the temperature and extract the medicinal power. Now seeing Yao Lao's control, he realized that there was a big gap.

It was not easy to extract the impurities from the Ice Blue Spirit Extract. This herb seemed to have spirits, and the residual medicinal power and impurities were entangled with each other and unwilling to separate. Yao Lao looked focused, constantly fine-tuning the temperature and intensity of the flame, and guiding the purification of the medicinal power with his skill. As time passed, the dark blue medicinal power became more and more pure, and the impurities turned into wisps of black smoke, rising up.

It took nearly two hours, and the medicinal power of the ice blue spirit was finally perfectly refined, condensed into a ball of dark blue essence, suspended in the corner of the medicine cauldron. Yao Lao did not dare to delay, and then he took out a blood soul crystal core that was blood red and seemed to have blood flowing in it. This crystal core was taken from a high-level soul beast and contained violent and powerful blood energy.

The blood soul crystal core entered the cauldron, instantly causing a violent turbulence. The blood energy released by the crystal core was like a surging wave, impacting the inner wall of the medicine cauldron, making a dull echo. The bone spirit cold fire was stimulated by this, and the fire became more intense, colliding violently with the blood energy. For a moment, the light in the cauldron shone, and the red and white lights intertwined into a dazzling light and shadow.

Seeing this, Yao Lao quickly formed seals with his hands, and injected spiritual power into the medicine cauldron, forcibly suppressing the riot of blood. Fine beads of sweat oozed from his forehead, but his eyes became more and more determined. Under the dual effects of fire and spiritual power, the blood of the blood soul crystal core was gradually tamed and slowly merged into the dark blue essence.

The fusion process of the two medicinal powers was slow and difficult. If one was not careful, all the previous efforts would be wasted. Yao Lao was fully focused, always paying attention to the subtle changes in the medicinal power and adjusting the rhythm of the flame. Xiao Yan did not dare to breathe at the side, knowing the key point at the moment.

After another half day, the sky gradually darkened and a thin layer of mist filled the valley. After unremitting efforts, the two medicinal powers finally began to blend, turning into a ball of purple-black thick liquid, the medicinal power fluctuations were vigorous and restrained.

However, the process of refining the elixir was only halfway through. Next, Yao Lao took out a piece of "Ice Soul Jade Marrow" that exuded a chilling aura. This thing was extremely resistant to flames and was a key auxiliary ingredient in refining the Yin-Yang Soul Pill. When the Ice Soul Jade Marrow was put into the cauldron, the temperature inside the cauldron dropped sharply, and the fire of the Bone Spirit Cold Fire was stagnant. Yao Lao increased his spiritual power output and drove the flame to fully wrap the Ice Soul Jade Marrow, trying to melt it and draw out the cold medicinal power in it. This process was like sailing against the current, and every bit of progress was extremely difficult. The Ice Soul Jade Marrow was like solid ice, resisting the erosion of flames, but Yao Lao, with his superb skills, disintegrated its defense inch by inch.

As the Ice Soul Jade Marrow gradually melted, the medicinal power in the medicine cauldron became more complex and difficult to control. The cold power, medicinal power, and flame power intertwined with each other, and the slightest mistake would cause energy to run wild. Yao Lao looked solemn, as if he was walking on thin ice, carefully balancing the power of all parties.

After a whole night of hard work, the Ice Soul Jade Marrow was finally completely integrated into the medicinal power, forming a chaotic and powerful pill prototype. This prototype was like a chaotic egg at the beginning of the universe, exuding a mysterious and attractive breath, and the fluctuations of the medicinal power caused the spiritual energy around the cave to vibrate.

At dawn, the morning light filtered into the cave. Yao Lao did not dare to slack off and entered the final stage of nurturing. He restrained the flames, turning them into strands of cold light, gently wrapping the prototype of the elixir, just like a mother caring for her baby, slowly guiding it to absorb the spiritual energy of heaven and earth and perfect itself.

As time went by, the pill became more and more round, with a layer of brilliant purple light on the surface, and the medicinal power was restrained and powerful. Xiao Yan was full of excitement, he knew that this Yin-Yang Soul Pill was about to be completed.

Just as the pill was about to take shape, Yao Lao's expression suddenly changed. He sensed a slight imbalance in energy. Instantly, he quickly formed seals with both hands, consuming his own soul power to forcibly stabilize the pill. His face was pale and his body was shaking. It was obvious that this remedy was extremely difficult.

Xiao Yan was extremely anxious, but he could not help and could only stand aside and worry. Fortunately, Yao Lao was experienced and successfully resolved the crisis at the critical moment.

Finally, with a slight hum, a perfect Yin-Yang Soul Pill slowly rose in the medicine cauldron, shining with purple light and overflowing with medicinal power. But before Xiao Yan could cheer, the sky outside the cave suddenly changed color, dark clouds, lightning and thunder.

Purple pill thunders struck down one after another, like the wrath of heaven, wanting to destroy this heaven-defying pill.

In the deep and quiet Star Forest, the sun usually shines through the lush branches and leaves, spots of light, and the roars of animals and the chirping of birds interweave into a natural melody. However, at this moment, all this peace was broken in an instant.

The sky was originally as clear as blue, but in an instant, the wind and clouds changed drastically. Rolling dark clouds were like a raging black tide, gathering madly from all directions, piling up layer by layer, covering the bright sky tightly.

Then, blinding and violent lightning flashed and jumped among the clouds, as if the angry Thunder God was wielding the Heavenly Punishment Halberd. Every flash of lightning illuminated the dark world with a pale white. Deafening thunder roared, as if it was going to tear the sky apart. The majestic sound waves spread to every corner of the Xingdou Great Forest with Xiao Yan as the center, scaring countless birds to flee and beasts to run in panic.

Deep in the forest, the Beast God Emperor Tian was meditating in a hidden valley, feeling the energy flow between heaven and earth, trying to break through his own shackles. The sudden change in the color of heaven and earth made him open his eyes abruptly, and a gleam of light flashed in his eyes.

"Could this strange phenomenon in the world mean that a soul beast is about to break through the 100,000-year limit?" Emperor Tian muttered to himself, with a bit of doubt and solemnity in his tone. In the long years of the Star Dou Great Forest, every time a soul beast hit this critical lifespan bottleneck, it would cause a resonance between heaven and earth, and similar amazing scenes would appear.

Di Tian moved, and flew up into the sky like a ghost, looking towards the core of the strange phenomenon. He saw that the direction of the flashing lightning was exactly where Xiao Yan was. He frowned slightly, and was puzzled: "Xiao Yan is just a human, how could he cause such a terrifying celestial phenomenon?"

Di Tian knew very well that Xiao Yan had a close relationship with the soul beast clan and had done great favors to the soul beasts before. He did not dare to delay for a moment and immediately let out a long and majestic roar, the sound waves spreading throughout the forest like ripples.

This roar was a call to action, and in an instant, the beasts from all over the Xingdou Great Forest responded one after another. They emerged from their hidden nests, dense bushes, or deep valleys, and ran swiftly towards where Emperor Tian was.

Each of these ferocious beasts has a powerful aura and wildness flashing in their eyes. Some have flames burning all over their bodies, while some have scales as hard as steel and emit cold light. They are all the overlords of the Star Dou Great Forest.

Emperor Tian looked at the ferocious beasts that were gathering quickly, his expression grim, and said loudly: "Follow me to the place of strange phenomena. The situation is unclear, so be careful!"

After saying that, he took the lead and flew towards Xiao Yan, followed closely by the other ferocious beasts. They were like a gust of wind sweeping through the forest, breaking branches and splashing earth and rocks wherever they passed.

At the same time, outside the cave where Xiao Yan was, pill lightning struck down crazily one after another. The Yin-Yang Soul Pill suspended above the medicine cauldron became more mysterious and dazzling under the reflection of the lightning. The fluctuation of the medicinal power caused ripples in the surrounding space. Yao Lao and Xiao Yan stood side by side, their faces pale but their eyes firm. They used all their strength to support a spiritual power shield to resist the violent impact of the pill lightning.

Every time a ray of lightning struck, the shield would violently fluctuate, as if it would shatter at any time, and the bodies of the two would tremble slightly, but they gritted their teeth and held on tightly.

Just as the pill thunder became more and more fierce, and Xiao Yan and Yao Lao were gradually exhausted, Di Tian arrived with all the fierce beasts. Di Tian saw the difficult situation of Xiao Yan and others at a glance, and was shocked. He shouted without hesitation: "All beasts, listen to my order, form a defensive formation, and help Xiao Yan!"

Upon receiving the order, the ferocious beasts quickly dispersed and formed a tight defensive circle around Xiao Yan and the others. They either spewed out powerful energy or released unique protective light, which blended with Xiao Yan and Yao Lao's spiritual power shields to jointly resist the ravages of the pill thunder.

Di Tian flashed to Xiao Yan's side and asked with concern: "Xiao Yan, what is going on? How could you trigger such a terrifying heavenly tribulation?"

Although Xiao Yan was exhausted, he still forced himself to cheer up and briefly explained the matter of refining the Yin-Yang Soul Pill and how it caused the pill thunder.

Upon hearing this, Di Tian nodded slightly, looking at the pill thunder that kept falling, with a resolute look in his eyes: "Don't be afraid, I am here today, and I will definitely not let your pill be destroyed!"

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