At this moment, as the Spiritual Qi was released, the originally dark-colored sphere began to change color.

The half closer to the Red Flame Spiritual Qi presented a crimson red.

The half closer to the Ice Spiritual Qi presented an icy blue.

However, as the two types of Spiritual Qi coordinated and resonated perfectly, and began to rotate slowly, these two colors began to distinctly merge.

Gradually, these two colors, like the dough in the hands of a noodle master, turned into strips, one crimson, one icy blue.

In less than ten seconds, it had evolved into hundreds of crimson strips and hundreds of icy blue strips.

As these colored stripes became finer and more numerous, the overall appearance started to show a dark purple hue.

It was at this moment that Wang Wu's Danger Perception combined with Spirit Essence's Spiritual Sensing detected that something seemed wrong with the Ninth-Grade Spirit Fruit inside.

Retracting both Red Flame and Ice Spiritual Qi, he opened the two hemispheres, and immediately a strange stench wafted out, as for that Ninth-Grade Spirit Fruit, it was already in a mess, reduced to a pool of mush.

Even the original Spiritual Qi was gone, unclear whether it dissipated or was spoiled.

But undoubtedly, this was a failure.

Wang Wu pondered, then consumed the spoiled Spirit Fruit, not to disgust himself, but because he needed a comprehensive evaluation to see where exactly the error occurred.

In this regard, his attribute bar was truly a BUG-level golden finger.

"You have consumed a strange fruit; its taste is unremarkable, but fortunately, it is non-toxic."

"Identification: This is an obviously ravaged Spirit Fruit. Who is so deranged? This isn't alchemy; it's purgatory."

——

At this moment, Wang Wu seemed to hear the laughter of Bear Mother, somewhat mocking, but mostly comforting.

He felt his old face was thoroughly embarrassed.

Alright, the problem is known—pushing too hard.

Alchemy requires attention to the control of flame, right?

What he sought was a higher efficiency in energy utilization, not directly changing the state of matter.

Next, Wang Wu replaced it with another Ninth-Grade Spirit Fruit and began the attempt again.

This time, he chose the most conservative method, using only Red Flame Spiritual Qi, avoiding the whimsical combination of Ice and Fire, which was akin to trying to run before learning to walk—an exaggerated mistake.

Moreover, this time, he only output a trickle of Red Flame Spiritual Qi, letting this bit of Red Flame Spiritual Qi rise like a wisp of smoke, wrapping around the sphere.

This time, a hair-thin dark red appeared on the sphere.

Wherever that bit of Red Flame Spiritual Qi drifted, the hair-like dark red floated along with it.

After lingering back and forth more than ten times, that bit of Red Flame Spiritual Qi was exhausted, and Wang Wu hurriedly added a bit, but the hair-like dark red line broke and couldn't reconnect.

Seeing this, he pondered and realized he had been too conservative again.

He promptly adjusted, increasing the output of Red Flame Spiritual Qi to 9 points, but divided into three shifts, allowing enough time to replenish the Red Flame Spiritual Qi, preventing disconnection.

Although this tripled the complexity of control, for Wang Wu, it was still manageable.

At this moment, the dark red lines on the sphere became somewhat thicker, and with the rotation of the Spiritual Qi, it resembled a wisp of red cloud, swirling and dancing in the dark sky.

Gradually, Wang Wu felt the need to speed up, as he sensed that if the speed was too slow, the temperature around the sphere would become unbalanced. Hence, without increasing the Red Flame Spiritual Qi, speeding up was the only method.

As the speed doubled, the effect immediately became apparent—the path of the Red Flame Spiritual Qi now formed a seamless connection of red clouds, and due to excessive speed, a comet-like smooth tail flame appeared.

Then, the red clouds began to spread up and down, and finally, under Wang Wu's adjustments, with three points of Red Flame Spiritual Qi as the standard output unit, he could achieve complete, even coverage of the entire sphere.

After achieving this, Wang Wu's Danger Perception + Spirit Essence finally noticed an unprecedented phenomenon, unrelated to the Spirit Fruit, unrelated to alchemy.

It was the exterior of the sphere; a relatively sealed, relatively stable Spiritual Energy Light Membrane seemed to have formed.

Under the effect of this Spiritual Energy Light Membrane, the Ninth-Grade Spirit Fruit, which he had been precisely monitoring and locking, suddenly became very ordinary, meaning he couldn't sense the Spiritual Qi; he knew the Spirit Fruit was still within, but just couldn't feel the Spiritual Qi.

This really amazed him.

He even thought this could likely be similar to phenomena like the Tyndall Effect, surface crystallization, steam phenomena, in physics and chemistry—an intrinsic phenomenon of Spiritual Qi.

If there were Spiritual Qi science in the Cultivation Realm.

Earthlings developed sciences from apples falling and steam boiling, so he might also create a science from this Spiritual Energy Light Membrane phenomenon.

Of course, he digressed.

Wang Wu simply realized that if the Spiritual Energy Light Membrane could be continuously strengthened and rapidly stabilized and released, it could absolutely achieve an active shielding effect in the process of applying spiritual energy.

Could this be the basic principle of Invisibility Dao Skill in the Human Race's Cultivation Realm?

For a moment, Wang Wu abandoned the notion of alchemy, solely focusing on how to strengthen his grasp of the Spiritual Energy Light Membrane phenomenon. As a bear adept at hiding, with an affinity for stealth, he couldn't resist the allure of invisibility.

This was much more important than alchemy.

Immediately, while maintaining the current stability, he gradually pressured the Spiritual Qi, researching more details of the Spiritual Energy Light Membrane phenomenon by increasing the amount of Spiritual Qi.

As expected, when the Spiritual Qi doubled, the phenomenon of the Spiritual Energy Light Membrane became difficult to maintain.

Therefore, it was necessary to continue increasing the speed of the Spiritual Qi circulation.

However, with the increase in speed, the amount of Spiritual Qi was insufficient, so he gradually added more Spiritual Qi, if the Spiritual Qi increased, he increased the speed; when the speed increased, he added more Spiritual Qi.

He gradually minimized the gap, adjusting again and again, until the quantity and speed finally reached a balance, and the phenomenon of the Spiritual Energy Light Membrane was once again recreated.

By this time, over half an hour had passed.

But Wang Wu didn't care at all; he was very excited, he loved this feeling.

Until he caught a whiff of a peculiar fragrance.

It seemed to be coming from the small sphere.

What exactly happened?

He was somewhat taken aback, then looked again at the beautifully intricate Spiritual Energy Light Membrane, something struck his heart — could this also be a necessary condition for alchemy?

The Spiritual Energy Light Membrane he had adjusted now required an average infusion of 15 points of Red Flame Spiritual Qi per second, with a total maintenance of 300 points, an average rotation speed of 500 times per second, and the thickness of the Spiritual Energy Light Membrane was about one centimeter. In this state of even movement, his Level 17 Danger Perception along with Level 11 Spirit Essence had completely lost any lock on the Ninth-Grade Spirit Fruit inside.

Nothing inside could be sensed.

In other words, under this Spiritual Energy Light Membrane, it had rendered the Ninth-Grade Spirit Fruit and the small sphere invisible.

However, it was still not stable enough because once the infusion of Spiritual Qi ceased, the phenomenon of the Spiritual Energy Light Membrane would immediately collapse.

It seemed there was still a very important condition needed for neutralization and stabilization.

Just like the difference between a steam engine and a boiling kettle.

He had only discovered the phenomenon of steam boiling in the kettle, to become like a steam engine, it still required more work, more conditions.

Thus—

Wang Wu hesitated for a moment, then resolutely gave up on the changes to the Ninth-Grade Spirit Fruit — even if you refine it into a Spirit Pill, how could it compare to the research on the Spiritual Energy Light Membrane?

So he began attempting to incorporate Ice Spiritual Qi, which was a very dangerous operation, because this time the Ice and Fire Spiritual Qi were not in sync or at the same frequency.

But he had to try every possibility; there was no such thing as reasonable or unreasonable in this matter.

Thus, a few seconds later.

"Boom!"

With a loud explosion, a fireball burst in front of Wang Wu, blasting him directly onto the stone wall, causing the entire cavern to shake violently, and cracks appeared on the stone walls.

Luckily, the neighbors next door weren't home.

But Wang Wu, covered in dust and dirt, wore a face full of excitement, even unbothered by the two shattered hemispheres, immediately gathering and producing the Spiritual Energy Light Membrane out of thin air.

This time, he directly added Ice Spiritual Qi from the start.

So a few seconds later, with a boom, the fireball exploded again, spreading frost everywhere and leaving a mess.

However, Wang Wu was increasingly confident.

Through one explosion after another, with one failure after another, he was always just a little bit away from success.

A day passed, ten days passed.

When winter passed and spring came, it was already his sixth year in this Cultivation Realm, when finally a small, stable Spiritual Qi sphere appeared in front of him.

No more explosions!

He finally found the correct variable, like discovering the legendary secret manual.

Yes, what determined whether the phenomenon of the Spiritual Energy Light Membrane was stable, depended on this variable.

Just as Newton needed to calculate the formula of gravity when an apple falls to the ground.

What Wang Wu tested repeatedly, searched for, was this variable formula.

With this variable formula, he could apply the phenomenon of the Spiritual Energy Light Membrane to reality.

And the balance between Ice Spiritual Qi and Red Flame Spiritual Qi was like the cylinder and piston of a steam engine.

Although he did not know how Human Race Cultivators did it, he indeed invented the 'steam engine.'

And at that moment, lines of information swiftly floated past his eyes.

"You have discovered and captured a nature of Spiritual Qi, and thus have learned a Daoist Technique—Basic Invisibility Technique."

"Explanation: This is an Acquired Technique, a Daoist Technique proud to be mastered by Human Race Cultivators. It is through the discovery and exploration of the rules of the Heaven and Earth Spiritual Qi, summarizing and sublimating these rules, ultimately achieving mastery. In this process, innate Bloodline Power offers no help, but wisdom, resilience, patience, knowledge, and experience are your best mentors and friends."

"Identification: Basic Invisibility Technique, by adjusting changes in Spiritual Qi, applies invisibility to designated targets, including oneself. Advantages include special effects on Guardian Reconnaissance Arrays of the Human Race and decent Concealment effects against the Demon Race's Remote Insight Divine Techniques, and can also be made into Invisibility Talismans. Disadvantages, it can be detected by the naked eye at close range, and it is surely exposed if encountered by reconnaissance arrays targeting it or Golden Celestial Eye Talismans."

"Your control over Red Flame Spiritual Qi has reached a higher level, improving your Basic Fire Spirit Root cultivation progress, currently at (9/10)."

"Your control over Ice Spiritual Qi has reached a higher level, improving your Basic Ice Spirit Root cultivation progress, currently at (9/10)."

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