Of course, Zhang Fan was still a little uneasy, in fact, he had thought about a lot of things very early: with his own spiritual cultivation, those ordinary foundation building powerhouses certainly had no way to play tricks on themselves. But if you encounter a real Jindan powerhouse, if you are too vulnerable, can you wipe it out with just a weapon such as a divine thunder cannon? Then there is no doubt that a child is facing a helicopter gunship with a recoilless artillery missile -- too crispy. The biggest significance of one's own strength is to increase the probability of survival in the case of being assassinated rather than being raided by oneself and plotting against others.

Because of this, when he made the credit for defeating Ouyang Jian and the others before, he thought of things such as the Centennial Spirit Gathering Grass and the Hundred-Year Qi Gathering Grass. At this time, his spiritual power and internal qi were obviously too inferior to other cultivations. If you take it directly, according to Zhang Fan's rough estimate: because his aura qualification is too weak, and even the spiritual root has not been formed, only using this lowest level of hundred-year-old spirit gathering grass will not be able to break through his strength to the level of the qi refining realm, and it will be good if he can break through the bottleneck and reach the level of a yellow soul ring warlock, not to mention that his strength will be limited, and it will leave more hidden dangers in the future. The same is true for Qi Gathering Grass, if you take it directly, it is estimated that it will help you improve from the sixth layer of Qi refining to the seventh layer, and there may be some hidden dangers when you step into the foundation building.

Zhang Fan began to think about the way to solve it very early. From some general knowledge in the library, Zhang Fan had heard about the legend of the spiritual liquid, and also heard some secret methods of preparing the spiritual liquid from the spirit stone. However, how exactly to use spirit stones to prepare spiritual liquid? There is no detailed explanation in some very simple generalizations. In the "Illusion Experiment" in the Qiankun Shield, it seems that as long as the spirit stone is crushed and soaked in the spirit liquid for a few years, it can be successful. It's just that Zhang Fan, who has some experience in experimenting in the Qiankun Shield Illusion, understands that he still seems to feel that his strength is not strong enough now, and what is successful in the illusion is not necessarily successful in reality. It's just that, at least, it hints at some direction like some kind of dream.

Zhang Fan once tested the strength of the lower grade spirit stone and found that even the lower grade spirit stone was still very strong. Even with his current direct strength and skill, he couldn't easily crush it, but of course this was not difficult for Zhang Fan.

First of all, the Divine Thunder Cannon was used to bombard the spirit stone with local electric energy, and it was about the same level as the peak of the foundation building when it was about a full blow, and then the spirit stone was finally smashed by a direct and accurate quasi-Xuangang warhead attack. However, it was only the size of a fist that was smashed into a hundred walnut-like pieces. This spirit stone is indeed a bit of a doorway: when it is attacked and hit by external forces, it will always be shattered into a slight difference in size and shape, but on the whole, the weight is not much different, just about 100 equal parts.

Zhang Fan carefully investigated with his spiritual power, and his spiritual power of about the thirty-third order was only a feeling in the dark: when he was smashed into a hundred smaller lower-grade spirit stones, it seemed that the total release capacity of the spiritual energy was a little more, maybe a few hundredths of a thousand more spiritual energy release speeds? This is obviously meaningless. However, if it is divided into smaller particles, will the aura be released faster?

At this time, Zhang Fan was glad that although he grew up in China rather than the Western education system when he was in primary and secondary school, he was a child who liked to fantasize and did not like to study and was slightly interested in science - although his grades in management were not good, and his hands-on ability was close to zero, but he was definitely more scientifically innovative than most children under Chinese-style education, because he was not confined to fixed correct answers, and thought more about the process and method. Because in the field of scientific research, in many cases, it is inherently trial and error, and there is no guarantee of what answer is correct.

It was only when this idea appeared, a whole set of methods came up with under the addition of more than thirty levels of spiritual power: first of all, the subtle crushing method that I could think of for the time being was the ultrasonic vibration method. With his current mental strength and internal qi, he can probably achieve about 10 megahertz of ultrasonic output at full power output, and the wavelength will be controlled in the range of more than 30 microns under normal air. In the past, Zhang Fan found in some experiments that carbon dioxide, the speed of sound propagation has become significantly slower, and this is even more true if some aura is added?

Thinking of this, Zhang Fan quickly began to work hard in the Qiankun Shield. Under the control of the aura and the internal qi, the exhaust gas emitted by a certain plant and the human body in the air introduced from the outside with a very small amount gathered and shrouded in the vicinity of a fragment of the spirit stone and faintly formed a dense and highly pure air mass. This does not require much spiritual power and spiritual power, so it can also allow Zhang Fan at this time to give full play in other aspects.

The high-frequency sound of tens of millions of hertz is formed by the internal force of the two palms and intersecting with each other, and the highly concentrated sound lines can concentrate most of the energy on the spirit stone when it is not too far away.

Under the fierce bombardment, Zhang Fan first found that the temperature of the spirit stone began to increase significantly under the attack of the huge energy of the super sound wave, and the spiritual energy seemed to be a little unstable, which was obviously not the result he wanted.

In order to solve this problem, Zhang Fan could only spend a few days to produce a carbon dioxide coolant that is not too small, and directly use his internal gas discharge capacity as a "compressor", but it turned out that it was not possible.

Of course, this also made the crushing process that Zhang Fan concentrated on very slow. It took about five days to finally crush the lower grade spirit stone that was larger than a walnut. This spirit stone is different from ordinary objects, there is hardly much smoke and dust spilling out when it is processed and crushed, until it receives enough energy to cause complete crushing, and the entire light green low-grade spirit stone suddenly turns into a light green light green like smoke and dust, and the speed of emitting spiritual energy is at least a hundred times that of before, which is almost the same as the legendary medium-grade spirit stone.

With Zhang Fan's mental power at this time, he could roughly feel that the debris in the light green smoke was less than 100 nanometers or 1/10th of a micron in diameter, and the weight and shape were still very regular. There is no doubt that after the shape and size became only about 1/10,000th of the original size, the aura expansion and diffusion effect, which originally seemed to increase very slightly, suddenly became very huge. Zhang Fan roughly guessed: This person on the face is estimated not to have the habit of measuring the speed of sound for various gases, but if some Yuanying powerhouse or the power of the god cultivates some special exercises, and produces a special ultrasonic wave of more than one billion hertz to crush, it is still possible to use this low-grade spirit stone or even a possible medium-grade spirit stone to make spiritual liquid powder.

In the following two months, Zhang Fan concocted according to the law, smashed ten walnut-sized lower-grade spirit stones one after another, and used spiritual power and internal qi spiritual energy to manipulate the pure water phase of the magazine to mix, turning it into a light green spiritual liquid. And use this single spirit liquid to "soillessly cultivate" the hundred-year-old spirit gathering grass. In order to prevent bad accidents from happening, Zhang Fan observed for ten days in a row, and made keen observations with his mental strength at this time. Although it was found that although the changes in the Gathering Spirit Grass were minimal, there were also changes that could be detected by Zhang Fan's spiritual power at this time, combined with the common knowledge that Zhang Fan had learned about some of the most basic spiritual herbs or elixirs in the library building, he could roughly make a judgment: In this unique cultivation environment, the probability of the Centennial Gathering Grass surviving the 200-year-old tribulation is likely to increase from about half to more than 50% under normal circumstances, and if the concentration of some spiritual liquid is slightly increased, it may reach more than 70%?

Under normal circumstances, Zhang Fan did not have the patience to wait for nearly a hundred years, after all, he may encounter danger at any time because of his heavy treasure. It's just that with the Qiankun Shield, it's completely different, maybe in about half a year outside, you can have a very obvious harvest? After all, more than 200 days outside is equivalent to more than 200 years inside. I don't know what kind of effect and degree the Gathering Spirit Grass will be able to achieve if it reaches three hundred years.

In the following time, Zhang Fan also began to work hard to use the benefits brought by this unique spiritual liquid to cultivate hard, and spent more than half a year or so in the Qiankun Shield to improve his spiritual power from the level of the white soul ring warlock to the level of the yellow soul ring warlock, after a lot of things, his spiritual power at this time finally improved to a level of about thirty-four steps.

In fact, according to Zhang Fan's feelings, the magnitude of these improvements may not be lower than the small-level growth in some fantasy novels, but compared to the problems and threats he may encounter, these are just better than nothing, and there is obviously still a long distance from Zhang Fan's expectations and even goals.

After about two years of busy and cultivation in the Qiankun Shield, more than two days have passed outside the time, and the three-day day is about to come. In Zhang Fan's view, of course, this is not a big deal or a difficult pass, but as a Transformation Realm cultivator, it is always not good to miss an appointment.