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**
That Earth Demon Puppet, once the force of the lightning dissipated, immediately followed Lin Feng's command and charged into the sky once more.
High above, the Pill Lightning seemed provoked by such insolence.
Within the dark clouds, countless thick silver serpents of lightning writhed.
"Boom! Boom! Boom!"
From the dense thunderclouds, several even stronger bolts of lightning once again condensed and fell, just like before, relentlessly striking down at this reckless Earth Demon Puppet.
Below, Lin Feng grinned cheerfully as he watched the spectacle unfolding in the sky.
Moments later, after releasing wave after wave of lightning, the thunderclouds finally depleted their power and gradually dispersed.
The blazing sun reappeared, scattering its scorching rays over the desert sands.
The Earth Demon Puppet, its surface now even more refined, descended silently to land at Lin Feng's side.
"Not bad. A peak seventh-tier Pill Lightning, with just a single strike, has upgraded a Six-Star Dou Zong-level Earth Demon to a peak Eight-Star. If there had been just one more bolt, it could have helped it step into the nine-star Dou Zong realm."
Lin Feng chuckled softly as he looked at the stone-like figure of the puppet before him.
With that, he stored the Earth Demon Puppet back into his ring.
After a brief moment of thought, Lin Feng sat cross-legged on the sand to restore his somewhat depleted Dou Qi and fatigued soul power.
With the experience of Dan Yitian in refining peak seventh-tier pills, along with his own hands-on attempt just now, Lin Feng believed that he now possessed the ability to refine a peak seventh-tier pill—the Bone Growing Blood Fusing Pill.
Of course, this confidence was also tied to the four complete sets of materials stored within his ring.
With so many resources, as long as he didn't make reckless mistakes, with his current skill, he was bound to succeed in at least one attempt.
Several days later, Lin Feng slowly opened his pitch-black eyes, exhaling a long breath of turbid air. Then, he flipped his palm, and from his ring emerged a dark-red scroll.
Within this scroll was recorded the formula for the peak seventh-tier pill, the Bone Growing Blood Fusing Pill.
Holding the two ends of the scroll, he carefully unfurled it.
At the same time, his soul power flowed into it. As his soul power touched the scroll, streams of extremely complex, densely-packed alchemist knowledge surged into his mind.
After reviewing the formula several times, Lin Feng extended his hand with a grasping motion.
Instantly, a spiral of cyan flame leapt from his body and dove into the crimson-colored Ten Thousand Beast Cauldron before him.
The blazing flames quickly heated the cauldron's previously cooled interior, raising its temperature.
Once the cauldron had grown sufficiently hot, Lin Feng slid a finger across his palm.
One by one, medicinal ingredients of various shapes flew out of his ring. They hovered in the air before gently suspending above the sandy ground beside him.
At a glance, there were at least over a hundred types of ingredients.
This alone showed just how terrifyingly complex the refinement of the Bone Growing Blood Fusing Pill truly was.
After laying out all the auxiliary herbs, Lin Feng waved his palm once again, and three jade boxes appeared, floating before him.
Inside each box was one of the three main ingredients required for the Bone Growing Blood Fusing Pill.
With everything prepared, Lin Feng's expression unknowingly grew solemn.
The Bone Growing Blood Fusing Pill was the most difficult pill he had ever attempted.
A single misstep, and the result would be an exploding cauldron and destroyed materials.
"Hu~"
Lin Feng took a deep breath, then flicked his palm sharply.
A dozen or so medicinal ingredients shot out, orderly entering the cauldron one after another.
The very instant they entered the cauldron, Lin Feng carefully adjusted the temperature of the flame within, preventing any explosions that might ruin the refinement.
Under his tireless refinement, about one-third of the ingredients were soon successfully purified.
After finishing these, his gaze shifted toward the three main ingredients required for the Bone Growing Blood Fusing Pill.
With a flick of his finger, the lid of a jade box popped open, revealing a carefully preserved piece of emerald-green withered vine.
The moment this vine was revealed, an abundant life force began slowly radiating from it.
This was one of the essential components for refining the Bone Growing Blood Fusing Pill—the Ten Thousand Year Old Green Spiritual Vine.
With a wave of his hand, he tossed it into the cauldron, immediately focusing all his attention on controlling the temperature of the Azure Wind Heart Flame.
Inside the crimson cauldron, the blazing heavenly flame roared, yet it could not harm the vine's seemingly fragile exterior.
But upon closer observation, faint motes of light shimmered across the vine, subtly shielding it from the scorching fire.
Seeing this, Lin Feng did not panic.
All heavenly treasures of heaven and earth possessed self-protection. Refining them always required extra effort.
Thus, Lin Feng calmly sat cross-legged, patiently refining the Ten Thousand Year Old Green Spiritual Vine within the cauldron.
This refinement lasted nearly half a day. Only then did the brittle-looking surface of the vine begin to crack apart. Droplets of vivid green sap slowly seeped out from the fissures.
After more than half an hour, the vine was completely transformed into a pool of bright green liquid.
Lin Feng quickly merged it with the other medicinal essences.
"Boom!"
During the fusion process, a small mistake suddenly caused the mixture to explode violently.
The heavy crimson cauldron was blasted into the air before crashing heavily back onto the sandy ground.
"Once more."
Lin Feng shook his head helplessly, took out another set of ingredients, and started again.
But the subsequent attempts were far from smooth.
Not until his third try did Lin Feng finally grasp the key to refining the Bone Growing Blood Fusing Pill.
Before him, within the Ten Thousand Beast Cauldron, a dark-red nascent pill slowly spun, glowing faintly.
Only then did Lin Feng's tense heart finally ease.
Now, as long as he stayed cautious and carefully nurtured this embryonic pill, he would succeed in producing the Bone Growing Blood Fusing Pill.
By the next morning, a vast surge of energy suddenly erupted from the crimson cauldron.
As the powerful wave spread out, the skies above roiled with thick, surging clouds.
From within the darkness, countless silver serpents of lightning coiled and danced, shrouding the heavens.
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