Fang Tianyou noticed that there seemed to be an invisible cover in front of him, isolating the poisonous gas from the space where the house was located. Outside the hood was a thin yellow mist like a light veil, but inside the hood was empty and transparent, just like the outer part of the valley.

"I don't know what is blocking the spread of poison gas. Fang Tianyou was full of curiosity about this strange phenomenon. However, he felt that there should be such a space in the valley.

Otherwise, the entire valley would be filled with poisonous gas, how could the previous disciples of the Five Poisons Sect stand it. Even if there were a few powerful Five Poison Sect disciples who could withstand it, most of the disciples should not be able to stay in the poisonous fog all day.

In order to find out, Fang Tianyou walked through those gardens and stepped into the "cover" with his legs raised, but he really had the feeling of stepping over an invisible energy membrane.

"This is, the power of the formation. It should be a small detoxification formation. Fang Tianyou sensed that the invisible energy was the power of the formation.

Standing inside the hood, trying to stop breathing, I breathed in the air here, and it didn't feel any different from outside the valley. Walking on the broken bricks and tiles, I searched aimlessly in this area for a while. Except for some traces of a fight, a few rusty blades, nothing suspicious was seen.

"Is it underground?" Fang Tianyou was not reconciled, and unfolded his divine sense to probe under the ground. It didn't take long for him to really find a clue.

It turned out that on the foundations of several houses, there were several jade talismans, and the power of the poison repellent formation was released from these jade talismans.

"It seems that there are still capable people in Huaxia cultivators. Looking at this formation, it is estimated that it should have been able to cover most of the valley before, but later without the blessing of people, the power of the jade talisman gradually weakened, and now it can only maintain a piece of sky the size of a dozen or so houses. Fang Tianyou sighed.

Fang Tianyou couldn't look down on those jade talismans, so he didn't plan to take them away. Fang Tianyou searched for a while, but found nothing, Fang Tianyou was about to turn around and return, but his divine sense suddenly swept to a large cave in the mountain wall behind the house.

Because the cave was closed by a stone gate, and the stone gate was overgrown with moss and weeds, Fang Tianyou didn't see it with the naked eye just now.

Fang Tianyou walked towards the stone gate and continued to explore with his divine sense, but found that the cave inside the stone gate was quite large, two hundred square meters. Fang Tianyou's divine sense passed through the stone gate, and he couldn't detect the entire cave at once.

I tried to push the stone door, and found that the stone door was quite heavy, but fortunately, there was no mechanism such as a stone bolt, and with the weight of the stone door of three or four hundred catties, Fang Tianyou still thought that he could push it open.

As soon as Fang Tianyou sank into his strength, the stone door really opened. A smell of mildew and dust came to my face. Fang Tianyou waited for the musty smell to dissipate before he walked in carefully.

There's a lot of space in it, but there's not much stuff in it. With the light coming from the door, Fang Tianyou saw that there was only a large pile of grain grains inside, which had been carbonized at this time. In addition to grains and grains, you can also vaguely see things like dried vegetable leaves.

Fang Tianyou couldn't help but feel a little disappointed in his heart, this was just a cave warehouse for the Five Poisons Sect to store food, and there was nothing of value.

Instead, he relied on a locked iron door in the innermost room to attract Fang Tianyou's attention. Since it is locked with an iron door, it means that there is something important inside.

Fang Tianyou probed with his divine sense and found that behind the iron gate was a long passage, and at the end of the passage, there was another door. It's just that that door is obviously within the detection range of Fang Tianyou's divine sense, but Fang Tianyou can't detect it thoroughly, which arouses Fang Tianyou's interest even more.

The iron lock was no obstacle to Fang Tianyou at all, he just held it in his hand and squeezed it slightly, and the lock broke in response.

It was pitch black in the passage, Fang Tianyou lit a torch at the iron gate, and then pushed open the iron door and walked into the passage. Although it is convenient to turn on the Divine Consciousness Detection, after all, it will consume a lot of Divine Consciousness, energy, and physical strength.

Today's trip to the Poison Miasma Valley, he has been probing for a long time, and he is already a little tired, so he can let his divine consciousness rest for a while, after all, he doesn't know what tense situation he will encounter later.

The passage was very quiet, and only Fang Tianyou's own footsteps could be heard. Fang Tianyou smelled a faint fragrance in the air here, with the medical experience of his previous life, Fang Tianyou guessed that this fragrance should be emitted by some kind of herb with disinfection and detoxification effect.

It's just that in the passage, Fang Tianyou didn't see the appearance of the herb, so he couldn't tell which kind of disinfectant herb it was.

Walking to the end of the passage, Fang Tianyou saw that the door was a wooden door. After all these years, the grain has been carbonized, and there is no trace of decay in this wooden door. When I looked closely, I found that this was originally a door made of peach wood, and the wooden block was coated with tung oil, no wonder it could be immortal for so many years.

Peach wood has the effect of exorcising souls and warding off evil spirits, no wonder it also has a trace of interference with Fang Tianyou's divine sense. Of course, this interference is very limited for the consciousness.

The distance was far just now, and the divine sense was a little weakened, so I didn't detect it. At this time, he was already close to the wooden door, and when Fang Tianyou used his divine sense to probe again, this time his divine sense successfully penetrated into it.

Behind the wooden door, there was another space of hundreds of square meters, but the things inside surprised Fang Tianyou. There were dozens of dried corpses piled up there! Most of the corpses were actually skeletons, and only a few still had a little shriveled fur.

"Could it be the tomb of the Five Poisons Sect?" Fang Tianyou couldn't help but be a little puzzled, but thinking about it, it didn't seem like it from this layout.

In order to find out the truth, Fang Tianyou decided to go in and have a look. Stretching out his hand to push open the slightly heavy peach wood door, a smell of poisonous gas came to his face, Fang Tianyou hurriedly changed to internal breathing, and closed the wooden door behind him to prevent the poisonous gas from escaping.

Fang Tianyou used the light of the fire to probe around, and found that in addition to dozens of human corpses here, there were also many bottles and cans, and there were medicinal foam powder in several bottles and cans.

"Could it be that these people are the pharmacists of the Five Poisons Sect, who are here to make poisons for the Five Poisons Sect, but why are they all dying here?" Fang Tianyou became more and more puzzled in his heart.

On a large desk behind the bottles and cans, Fang Tianyou found a book. This book finally solved the mystery in Fang Tianyou's heart.

It turns out that this is the medicine testing room of the Five Poisons Sect! The people who died here are not pharmacists of the Five Poisons Sect, but slaves who were captured by the Five Poisons Sect and locked up here to test the effects of poisons or antidotes!

In that booklet, their drug trial plan was recorded in detail. The people who tested the drugs were numbered, which person used which poison, how many doses, the symptoms of taking the poison, and so on are recorded in detail.

And judging from the records in the book, the people they used to test the medicine were far more than the dozens of people in front of them. People are dying here every day. Every month, a new group of living people is arrested.

"These Five Poison Sects seem to be really vicious, perhaps it is precisely because of such a number of sects that the entire Witch Sect will not be treated well. Fang Tianyou sighed.

Fang Tianyou continued to explore around with a torch, and when he approached the innermost part of this stone room, he suddenly sensed that there seemed to be a figure flickering in front of him. Fang Tianyou was taken aback, and took a picture of it with a torch, but he didn't find anything abnormal.

"This time it's developed, master!" the voice of the yin ghost sounded here, with some surprise in his voice, as if a greedy child had seen candy.

"Could it be ......" This made Fang Tianyou think of a possibility, and hurriedly opened his divine sense again, and sure enough, he found that there were more than a dozen yin spirits floating around his body.

And these Yin Spirits are much more powerful than in the Ancient Tomb of Baopuzi. Although each one is not said to be able to catch up with the strength of the original Yin Ghost, it is almost half of his original strength.

It stands to reason that the one holding the puff is a thousand-year-old tomb, and the yin soul should be stronger, why is the yin here stronger than the one in the tomb.

Fang Tianyou thought about it for a while, and soon understood the truth. The yin ghost in the ancient tomb of Baopuzi should have entered the ancient tomb later, and then used the ancient tomb as a place to avoid chaos, and it was not a thousand-year-old yin ghost.

And the yin souls in this medicine testing room were all killed by the Five Poisons Sect, they were unwilling and resentful, so their soul power was condensed but not dispersed, and it was easy to form yin souls.

In addition, this place is located in a dark and low ground, the space is closed, and there is a peach wood door blocking the door, so they can't get out if they want to, and many yin spirits are biting each other and devouring each other, so they have gradually become stronger.

Of course, the current strength of the Yin Ghost is several times stronger than before, and these Yin Ghosts in front of him are simply little children to him, this is to send him cultivation resources again, no wonder the Yin Ghost is so excited.

"These yin spirits, staying here is also a scourge, your ghost cultivation method is now soaring, but it just happened to fulfill you. Well, you go and devour it, and by the way, see if you can find some useful information in their soul power fragments. Fang Tianyou said to the Yin Ghost.

"Okay, master. The Yin Ghost replied, controlling the cold iron needle to pounce on one of the Yin Spirits, quickly scattering the opponent, and then began to devour the opponent's soul power.

Fang Tianyou sensed a flash of light in the soul cultivation jade, and a trace of soul power of the yin soul was also swallowed into the jade. This made Fang Tianyou's heart move, if he let the soul cultivation jade absorb the soul power and store it, it would not be bad.

Fang Tianyou further thought that he had consumed a lot today, and he was just using these Yin Souls to replenish it, anyway, with so many powerful Yin Souls, the Yin Ghost would definitely not be able to eat it alone!

Thinking like this, Fang Tianyou also began to operate the "Hongmeng Immortal Sutra" to devour his soul power, constantly replenishing and nourishing his divine sense.

For a moment, there was silence in the stone room. All that was left was the sound of torches burning and the occasional whisper of an inaudible ghost.