After Wu Ji examined the bones, he discovered that these seven sets of bones all had traces of poisoning.

After a person died from poison, their corpse would show an abnormal grayish-black color, and these seven bones were the same.

Moreover, in these pits, he even found some leftover sulphur lime and cinnabar mixed in. Because of the passage of time, they were almost the same color as the earth. Only after careful examination would one be able to find any clues.

These things were usually useless under normal circumstances, especially when they were mixed together. Usually, they would only be seen in practice or in tombs.

But Wu Ji believed that in this situation, the uses of these things were both at once.

I once heard my aunt mention that saltpeter, sulphur, lime, and other things would be used in the old days for tombs. Because these things had the function of moisture-proof and decaying, they would be placed between the coffin and the coffin.

Moreover, these things could also be used to kill bacteria, preventing bacteria from entering the coffin. This way, the corpse would not rot for a hundred years.

When I heard this, I felt that it was very strange, so I was quite impressed.

Wu Ji nodded after hearing what I said, and said that I was right. However, there was one thing that I need to note, those things should be stored outside the coffin.

I think it's really like that, but I still can't understand the difference. After all, being trapped in a place like Xiao Xi Kou and wanting to buy seven coffins to put the corpses in is not a realistic idea.

Wu Ji called me stupid, although these things have a certain degree of antiseptic and moisturizing effect, once used on corpses, it will cause extreme pain to the dead, as though they are on fire!

Moreover, these people were still alive when they were buried. Just what kind of feeling did it feel like for a living person to be lying on quicklime? It was even worse after death!

I shivered when I heard this. Could it be that the person who buried these people was deliberately tormenting these seven people? Not only did he bury them alive, but he also wanted them to die a miserable death.

And I asked Wu Ji: "You kept saying that these people weren't dead when they were buried, but just based on the fact that these bones showed signs of being poisoned, this point is a bit far-fetched right?"

Wu Ji nodded and said, "That's right, we naturally cannot rely on just this."

All of these speculations came from the seven sets of bones in front of him. The corpses were accompanied by cinnabar and other objects. Combined with his geographical location, it made him think of an array formation that he had once seen in an ancient book.

It was also because he thought of this array and then used inference to come up with these conclusions that he did indeed answer the questions that we were looking at.

"What formation is this?" I asked him at once.

"Seven Fiends Soul Refining Formation!" Wu Ji's voice was slow but every word he spoke made it seem as if he was gritting his teeth.

He said that according to the ancient records, this formation was extremely vicious. It was created by a senior from the ancient Daoist Sect. However, it was precisely because he had used such a vicious formation on his own that he was punished and expelled from the sect.

As the name implied, the Seven Fiends Soul Refining Formation required seven living people.

The caster would use the Soul-Sealing Spike to firmly nail the souls of these seven people to their bodies. Then, the seven would form a straight line and be buried alive at a specific location.

In order to increase the pain and killing intent, they would add quicklime, cinnabar, sulfur, and more to the place where the corpses were buried.

The poison would not kill them, it would only make the seven of them suffer even more. It was better to die than to live.

In the end, under the extreme agony of these seven people, he buried them alive.

After being buried alive, these people would die very soon. However, because their souls were locked by the Soul-Sealing Spike, it was impossible for them to leave their bodies even after death.

A long period of resentment served as a form of enmity. These people had already died an unjust death, and were now being tormented for all eternity. Naturally, their killing intent soared greatly.

As for this baleful aura, it would form a barrier that would separate the inside and the outside of this line.

"Simply put, the infernal energy formed by these corpses will eventually turn into a transparent wall!" I asked Wu Ji probingly.

He nodded, proving that my guess was correct.

"But what's the point? What can this wall do? " I don't understand.

The person who created this evil art, did he really think of using such extreme methods to kill someone just to create a wall formed by killing aura?

Wu Ji said that the effect of this wall was not big, but it was not small either, to see how it could be used.

In the past, the person who created this formation was said to have lost many people during the war and caused a great deal of trouble.

Thus, a rich old master invited this Taoist and asked him to dissolve it.

After the Daoist Priest looked around, he discovered that the place was actually a pit abandoned by corpses during wartime. The people that died in the vicinity would all be thrown there and change over time.

The resentment there was monstrous, and it had long since become the climate. If he wanted to get rid of this problem, it wouldn't be easy to solve it in a day or two.

However, Old Master Fu had given him a lot of money, so the Daoist Priest immediately became greedy and thought of a treacherous method.

He thought that since the resentment in the corpse pit was great, then he would just create a bigger one to suppress the resentful ghosts.

Ghosts couldn't compare to humans. They were extremely sensitive to resentment and it was almost impossible for them to meet force with force. So as long as they encountered something stronger than them, they would immediately be obedient.

As a result, this Daoist Priest created the Seven Fiends Soul Refining Formation.

He had the master of the Fu family find seven people who had spoken during the dark years, and after a round of torture, he used all means at his disposal to make them suffer and then buried them alive at midnight.

In the end, as he had hoped, the Seven Fiends Soul Refining Formation was very powerful, and indeed it had managed to suppress the ghosts in the corpse pit.

The most cruel part of this formation was not being buried alive, but after the death of these seven people, their souls would be nailed to their bodies and then tortured for eternity. This was the most cruel thing to do.

When the sect learned of this matter, they chased him out of the sect. From then on, the Daoist Priest disappeared without a trace.

"Cultivators actually have such malicious thoughts just for money!" I spat on him shamelessly.

Wu Ji sighed, it said that not all cultivators could truly cultivate to perfection, that the human heart was evil and the human heart was kind, no one could be completely sure.

"Could it be that the reason this Seven Fiends Soul Refining Formation is here is also to block something within the Xiao Xi Kou?" I subconsciously speculated.

Wu Ji said that it was possible, but there was no resentment here, so the usage of the Seven Fiends Soul Refining Formation should be different from what the rich master did.

"No matter what, we must have done a good deed to discover the Seven Fiends Soul Refining Formation and dig out their corpses from this fiery pit." Looking at these seven bones, I felt discontent in my heart.

At first, he had been extremely cautious, but now, he felt that these people were truly pitiful.

These knowledgeable youngsters had entered the Xiao Xi Kou with passion and bloodlust, wanting to break through the feudal superstition and fight to the death. However, they had not expected that they would end up in such a state.

That person probably told me in a dream last night to come here with Wu Ji because they were tortured for too long. When someone like Wu Ji and I can finally free them, that should be it.

"What should I do next?" I asked Wu Ji.

He said that he would first wait for dawn, then find a good place to bury this new set of bones, and then exceed it.

Although the Xiao Xi Kou was not a precious land of wind and water, after escaping from the Seven Fiends Soul Refining Formation, their souls would still return to heaven after going through a breakthrough, and they wouldn't need to suffer the pain of their souls being burned by fire anymore.

We made up our minds and decided to wait for dawn.

During this period of time, Wu Ji and I had been thinking about who had set up this Seven Fiends Soul Refining Formation. According to the news that the village had received, it should have been one of the villagers who followed closely after us into the Xiao Xi Kou.

However, we didn't hear from our aunt that any of those villagers could use magic.

It seems that if it wasn't for the fact that aunt hid some of these things from us, she wouldn't have known about a lot of other things.

As he watched, the sky turned white and it was the beginning of a new day.

Wu Ji found a suitable burial spot nearby and we dug together, returning the seven sets of bones from the grave to the earth.