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Most of them are used for healing and health preservation.

But the advantage is that there are sufficient quantities.

Xu Nuo thought for a moment and believed that only Hua Ling was best at handling and re-refining this kind of elixir.

It seems that I need to find ways to keep the flower spirit by my side from now on.

Not long after, Chen Yulou, along with Hong Girl, Hua Ling, the old foreigner and others, also came down the rope ladder.

Many strong men from Xialing began to quickly search for the coffins and valuables in the Danjing.

Taking advantage of this opportunity, Xu Nuo checked the Panwang Bowl in his hand.

Suddenly, a small purple flying insect flew into the air from the bowl.

It is shaped like a beetle and is about the size of a thumb.

The purple shell exudes a metallic luster and is dotted with silver ripples.

What's even more strange is that there is electric light flowing around it.

Seeing this reminded Xu Nuo of the ancient god's servant, Dapu ghost insect, who had been near the ninth floor of Kunlun Demon Tower.

A ladybug-like creature that can release the two extreme powers of infinite karmic fire and Naiqiong divine ice.

Who would have thought that the Yin Lei Gu that he created would be similar to this kind of thing?

The only difference is that this is a Gu, not a ghost insect.

Then a voice came from my mind.

"You have refined a top-grade Xuan-level Gu worm—the Yin Lei Gu."

"Because you have successfully refined the Yin Lei Gu and gained something from it, I will specially teach you the Five Thunder Finger Technique." Xu Nuo was quite surprised when he heard these words.

Previously, I learned the secret technique of training thunder Gu.

Unexpectedly, what was finally born was Yin Lei Gu instead of simple Lei Gu.

You should know that the Yin Lei Gu is more powerful than the ordinary Lei Gu.

Its Yin thunder can not only destroy all kinds of evil spirits,

It can even severely damage the souls of those who practice Taoism and monsters.

This is truly unusual.

It can completely destroy the soul of the person who is poisoned, turning it into ashes.

Xu Nuo was initially puzzled as to why he produced the Yin Lei Gu instead of the original Lei Gu.

But after a little thought, he suddenly understood.

It is very likely that when he absorbed the mercury vapor at the bottom of the Dan Well, he also inhaled the dust of hundreds of thousand-year-old zombies here into his body.

These corpse dusts contained extremely strong evil energy. After mixing with the thunder Gu, they unexpectedly formed the even more bizarre Yin Thunder Gu.

For Xu Nuo, this was indeed a little surprise.

However, this Yin Lei Gu is not without flaws.

Its characteristic is that it releases a very destructive Yin Thunder at the cost of its own life - once the Yin Thunder is released, the Yin Thunder Gu will also dissipate.

Xu Nuo understood this: if this small Yin Lei Gu could release Yin Lei repeatedly, it would be too powerful.

Just imagine, relying on only one Yin Lei Gu to sweep through all the ancient tombs in the world, solving the problem is as simple as replacing the insect, it is really difficult to balance the pros and cons.

After all, it is not something that ordinary practitioners can achieve to unleash the Yin Lei magic with such great power. Only those legendary figures who have reached the highest level of cultivation and are able to hold thunder in their hands can perform such magical skills.

However, the heavenly thunder released by the Yin Lei Gu is even more powerful than the heavenly thunder condensed by these powerful beings themselves.

Apart from the limitation that it can only be used once, it is perfect.

In addition, Xu Nuo realized a unique skill - the Five Thunder Finger Technique - through refining the Yin Lei Gu.

The Five Thunder Finger Technique is actually an authentic Taoist secret method. Although it cannot directly summon thunder from the sky, it can greatly increase the power of lightning induced by other means. It also gives Xu Nuo the ability to control and direct natural thunder.

This means a lot to Xu Nuo.

With the Yin Lei Gu, one can release powerful heavenly thunder, and with the blessing of the Five Thunder Finger Technique, one can even use the power of external lightning to further enhance the effect of the heavenly thunder in areas with frequent thunderstorms, and even guide it into the Pan Wang Bowl for secondary refining to obtain more Lei Gu materials.

After all, cinnabar, mercury, etc. are easy to obtain, but the real power of thunder and lightning is extremely rare.

In this way, Xu Nuo will have the opportunity to produce more Thunder Gu continuously.

However, the next scene made Xu Nuo's eyes widen again: another Yin Lei Gu flew up from Pan Wang Bowl, its body color was like purple glass, with silver-white light flowing around it, and electric flashes jumping all over it. Although its appearance was not luxurious, it carried an extremely dangerous aura.

Then, the second and third appeared one after another...until finally, there were five of them!

Xu Nuo felt relieved: Although the Yin Lei Gu is a top-grade Xuan-level demon Gu with earth-shaking power, it has many constraints in practical application due to its one-time consumption feature.

If there is only one Yin Lei Gu, even if its power is astonishing, there are still many uncertainties in a complex and dangerous environment.

But if Xu Nuo had five Yin Lei Gu, the situation would be completely different - if one couldn't solve a problem, he could always get a second one; if the second one still didn't work, he could always get a third, fourth, or even fifth one! Xu Nuo didn't believe there would be any kind of evil spirit on this bottle mountain that could survive the bombardment of five Yin Lei Gu in succession.

Of course, he also knew that there was definitely more than one powerful opponent within Pingshan.

For example, the Xiangxi Corpse King, the Iron Pipa Black Scorpion, and the Black-Scaled Python, etc.

In addition, this strange place is more dangerous than previous memories, and there may be more unknown and powerful enemies.

Therefore, even though the Yin Lei Gu is powerful, you still need to plan carefully when using it.

Soon after, most of the coffins at the bottom of the Dan Well were cleared away.

At this time, a cry of surprise came from the group of Xiangling strongmen.

Xu Nuo noticed that there were many strong men gathered at the center of the bottom of the Danjing.

There lies a huge stone slab.

Two vague human figures can be vaguely seen on the stone slab.

When seeing this scene, Chen Yulou also showed a hint of worry.

"Not good. The alchemists here not only use zombie coffins to make elixirs, but also use human souls to make elixirs..."

Xu Nuo almost couldn't help laughing after hearing this: "Don't worry, the human-shaped pattern on the stone slab is not a ghost, but a Yaksha Asura." After hearing Xu Nuo's explanation, the other Xiangling Lishi immediately stepped forward to clear the debris on the surface of the stone slab.

Soon, the two patterns were completely revealed.

Just as Xu Nuo said, these are two extremely ferocious ghost reliefs, and their shapes are as lifelike as Yakshas and Asuras.

But what is strange is that these two evil ghost statues have no eyes on their faces, which makes them look very weird.

There were only two big holes where the eyes should have been, and it was obviously empty.

After seeing the images of the two evil spirits, Xu Nuo suddenly heard a whisper in his ear:

"You saw this blind Rakshasa statue guarding the gate and gained some enlightenment, thus gaining the magical power - Blind Rakshasa."

Xu Nuo was slightly stunned when he heard this.

This blind Rakshasa with supernatural powers is really weird.

It requires sacrificing the caster's normal vision in exchange for heightened acuity of senses such as hearing, smell, and touch, while also greatly increasing speed and strength.

But this sacrifice and improvement is only temporary. Once you stop using your magical powers, everything will return to normal.

To Xu Nuo, this magical power is more like an emergency measure to save lives in some special circumstances. It may have unique effects, but it may not be convenient to use under normal circumstances.

Next, they prepared to open the stone door carved with the pattern of evil spirits and Rakshasa.

Before taking action, they found that the stone gate was covered with special copper locks.

These are the dog-head locks unique to the Song Dynasty, often used to lock city gates.

Due to the complex design of the canine teeth, it is extremely difficult to open unless you have a key.

However, this difficulty did not stump Xiling Lishi.

Soon, the strong men brought crowbars, hammers, saws and other tools, and everyone showed their skills.

The seemingly sturdy dog-head lock was pried open by brute force.

After the stone door opened, a huge dark cave immediately appeared in front of everyone, and it was pitch black inside.

Since the Danjing is located in the main hall in the belly of Pingshan Mountain, the light is dim.

The surroundings are illuminated only by the light emitted from the golden-armored deity's body.

When we reached the bottom of the Dan Well, even with the help of torches, it was still difficult to see the situation dozens of meters away.

This Yin Palace Cave is hidden deep beneath the Dan Well. There is no natural light source and you can't see your hand in front of you.

However, the air in the cave was obviously circulating. As soon as the stone door was opened, everyone could hear gusts of wind coming from below.

Xu Nuo quickly came to the entrance of the cave to investigate.

He was surprised to find that about ten meters away from the bottom of the cave, there was a silhouette of a giant tree.

Seeing this thing, he suddenly recalled the related legend.

It was a rare giant osmanthus tree, growing in the deepest and darkest part of Pingshan Mountain.

However, the branches and leaves are incredibly lush, giving off a cold and ghostly aura, with an oppressive gloomy energy lingering among them.

After using Queting Divine Eyes, Xu Nuo discovered that the trunk of the giant osmanthus tree in front of him was covered with rugged bark. The textures were so strange that they looked like the outline of an open human face, with all the facial features clearly visible.

However, these "human faces" are extremely ugly, of varying sizes, and tilted in distribution, and their expressions are full of sorrow and pain, as if they are filled with endless grief and indignation.

Apparently, there seemed to be many lonely souls imprisoned inside this tree.

With curiosity in his heart, Xu Nuo jumped up, stood on the tree, pulled out the Broken Moon Sword and lightly scratched the bark. The tip of the sword happened to fall right in the center of a distorted human face.

As a scratch appeared, a gloomy breath poured out from the crack like a tide, making a sighing sound like a human voice.

Then, dark red liquid as red as blood gushed out.

Xu Nuo frowned and sensed the strong yin energy in it.

At this moment, a strange thought flashed through his mind: "You discovered the secret of the Yin Palace Corpse Gui, and gained some experience from it, thus realizing the method of walking in the Yin."

The so-called Yin Gong Shi Gui, according to legend, is an evil plant that was bred by the foul smell of ancient corpses. It can be said to be an extremely ominous species in nature, and it also exists as a link between the Yin and Yang worlds.

Unexpectedly, due to his extraordinary understanding, he actually got the initial touch of a secret and peculiar cultivation system through these strange things - the Yin-Walking Magic.

The four mysterious skills of Xiangxi are mentioned: the Sky-Splitting Gu breaks the mechanism and absorbs the power of folk beliefs to improve the realm; the Gu technique has a long history and originated from the ancient insect totem worship, which can cultivate poisonous insects to control all things and then enter the house to approach the Tao; the corpse-driving technique is mysterious and unpredictable; the girl who fell into the cave is regrettable.

In comparison, although "walking in the underworld" appeared later, its principle is to allow people to go to the underworld in the form of a spirit leaving the body to inquire about information and rescue the dead.