After waiting for almost two hours, Elder Wu finally finished practicing, made a bunk by the stone stove, washed and slept.

Just in case, Shen Yun ordered his sleeping cave in the air, and then got up and left the cave and went outside.

By this time, it was late at night.

The moonlight is like water, illuminating the surrounding night more and more silent.

Shen Yun released his divine sense and carefully searched within a radius of five miles.

Everything is fine, and there is nothing wrong with it.

He first experimented with fireballs.

With minimal force, shoot a fireball not much bigger than a pigeon's egg from a bluestone five paces away.

"Peng-", the small fireball quickly engulfed the millstone-sized bluestone.

When it was too late, it was too fast, and Shen Yun quickly threw out a flowing cloud sleeve and extinguished it.

But, it's still too late.

The bluestone blocks had turned blackened, and the whole body was covered with fine lines as if it were covered with a spider's web.

It can be inferred that if he had been a little slower to extinguish the fire, the bluestone block would have exploded into countless pieces of ballast.

Shen Yun's heart was awe-inspiring.

The monk's fireball technique is to force the fire aura in the body to the fingertips, quickly ignite it, form a fireball, and finally hit it. Therefore, the power of the fireball technique directly depends on two factors, one is the fire aura in the monk's body, the greater the power of the fireball technique, and the other is the monk's cultivation.

Generally speaking, the more advanced a monk's cultivation is, the stronger and more refined the fire aura in his body, and the more powerful the fireball technique he casts.

It is precisely because the fireball technique is the burning of fire aura that it is stronger than ordinary mortal fire.

However, for the monks in the foundation building period, the degree to which the fireballs that were shot out were stronger than ordinary fires was still relatively limited.

Like the small fireball that Shen Yun shot just now, it didn't use all its strength at all, but it had obviously reached the level of a medium-level earth fire—in the ancestor's jade slip, it was mentioned that the fire between heaven and earth was also divided into grades. Among them, Fan Huo has the lowest level. The fires that are higher than the ordinary fires are the fire of the earth and the fire of the sky. The latter two are divided into three major grades: upper, middle and lower. Each major grade is divided into ten sub-tiers.

Medium-level earth fire, under normal circumstances, is the power that only the primordial infant powers of the fire system can have!

So, what about the abnormal situation?

It's a demon cultivator or a demon race.

The demonic aura is much stronger than the Five Elements Aura. Therefore, the fire fought by the demon cultivators or the demon clan is far stronger than that of the cultivators. For example: a mid-level earth-fire level fireball can be hit by a demon cultivator in the late stage of the Jindan Realm, or a high-level demon soldier.

Could it be that my fireball technique has become so strong because of the evil spirit?

Shen Yun took a deep breath, suppressed the chaos in his heart, spread out his divine sense, and wrapped the large blackened stone tightly.

No black gas!

There is no gray gas either!

Not even the residual fluctuations of spiritual power!

It was as if the big stone had been burned by mortal fire to become this virtuous character.

Obviously, I used my spiritual power one after another just now, and I used the Fireball Technique and the Flowing Cloud Sleeve. Shen Yun raised his hands in disbelief to his eyes.

Try something else.

With a thought in his mind, he tried the other four basic spells such as the Water Polo Technique, the Earth Splitting Technique, the Iron Cone Technique, and the Wood Thorn Technique.

Compared with the Fireball Technique, they have all become much stronger, but without exception, after using them, they did not leave any residual fluctuations of black gas, gray gas, and spiritual power on the scene.

The test proved that his previous worries were too much.

In addition to the above two unusual points, Shen Yun made a new discovery, that is, after using so many spells, the spiritual power was actually only consumed by more than half of the feeling. And if it had been yesterday, his spiritual power would have been consumed to the alert level.

Needless to say, the root of all this lies in the gray gas in his dantian.

In this regard, Shen Yun finally had a feeling of picking up a treasure. Couldn't be more satisfied with gray gas.

He was curious - how durable could gray gas really be?

Immediately, he used the five basic spells one by one.

Fireballs, water balloons, iron cones......

It didn't take long for the little turf he was standing on turned red sand.

His forehead finally hurt like a pinprick. Shen Yun was not only not annoyed, but pressed his temple on one side, grinned, and laughed happily.

Hahaha! After the experiment just now, he found that he was ten times more powerful than before!

Interestingly, the strength of the demon cultivators of the third layer of foundation building was only three times greater than that of the cultivators of the same level, and even the junior demon soldiers equivalent to the foundation building realm were only five or six times the strength.

Some experiments have confirmed that the gray gas is much stronger than the five elements aura and the yin qi.

After being happy, Shen Yun found himself facing a new problem. That is, after the gray gas is consumed to the alert level, how can it be replenished?

If the gray gas cannot be replenished after consumption, it will be useless no matter how good it is.

With a breath of turbidity, he hurried back into the cave.

Elder Wu was still asleep, undisturbed by the movement he had made outside the cave.

Shen Yun returned to the firewood pile, sat down cross-legged again, took a Yunling Pill, and began to try to drive the Jade Washing Formula.

The Dan liquefied, and as usual, there was a burst of warmth in the dantian.

On the other hand, the exercises are running as smoothly as before.

Frowning slightly, he looked at the dantian distractedly.

That large cloud of gray gas was actually slowly rotating with the operation of the exercises!

As it rotated, the gray gas slowly spread from the dantian to the second vein of Rendu, as well as the meridians around the body...... After one exercise, the gray gas in the meridians around the body was full. However, the gray atmosphere mass in the dantian showed no signs of decreasing.

From this point of view, taking the elixir is also effective for gray gas.

Shen Yun suddenly had no worries - so far, his understanding of the gray gas was that not only did it not hinder his cultivation in any way, but it was also better than the Five Elements Aura.

The only bad thing is that it looks chaotic and not as gorgeous as the Five Elements Aura. This inconspicuous appearance also directly affected his spiritual power. In the past, his spiritual power was dazzling silver-white, but now, it has become a beige-white like rice milk.

The color of the spiritual power of the cultivator is executed by the spiritual root in his dantian. Generally, the fewer types of spiritual roots, the more refined they are, and the brighter the color of their spiritual power. For example, the cultivators of the Heavenly Fire Spirit Root only have the Fire Spirit Root in their dantian, and the purity of the essence reaches more than ninety percent. Their spiritual power is very close to the original color of the fire aura. For example, a cultivator with a single fire spirit root, an earth fire spirit root, has a lighter color of spiritual power, and for example, a cultivator with five spiritual roots, whose spiritual power is white. Among them, the purer the five spiritual roots, the more translucent the spiritual power is. Before, his spiritual power was silvery-white, and judging from this point alone, others would often regard him as the Heavenly Five Spirit Root. And now, his spiritual power turned into a thick pulp-like off-white...... Well, it's the same hue as those pseudo-five spirit roots that are considered waste materials.

However, Shen Yun didn't care at all. In the cultivation realm, strength is everything. Bright spiritual power is touted, and that's because it represents the strongest strength or potential among fellow monks, not because it's beautiful to look at.

Although the spiritual power he played out looked like a pseudo-five spirit root, the power contained in it was not a pseudo-five spirit root. To put it mildly, a lot of the time, it's a disguise. Let's have fun on our own.