Three days later, Lei Yu woke up again, still in the Iron Man Temple. He didn't suffer any damage, on the contrary, all of his injuries were healed. The whole body is full of vitality, even stronger than before, and the physical body is even stronger.

As for the iron puppet in the original Iron Man Palace, he knelt beside Lei Yu, and the red light in his eyes had disappeared, replaced by a deferential demeanor, so that Lei Yu didn't know what to do for a while.

These puppets did not move again, they returned to their original state, and the thunder power in their bodies had dissipated, and it was impossible to resurrect again. Seeing this, Lei Yu breathed a sigh of relief in his heart, at least he would not be killed by these puppets, and there was still hope of getting out of the Netherworld.

It's just that, Lei Yu is extremely curious about the mysterious power that saved him twice. This is already the second time that this kind of power has saved Lei Yu, the previous time was when he appeared in his body for no reason when he spent the "Thunder Tribulation" in the Thunder Pool, expelling the Zixiao Divine Thunder from his body. And this time this mysterious power saved him at his most critical time, how not to make him curious.

But Lei Yu searched in his body for a long time, but he still didn't find the source of this power, so he could only suppress his curiosity. After all, this kind of power is too powerful and too mysterious, and it is not something that Lei Yu can grasp at this time.

"Let's take a look at the second-floor palace first, the palace here doesn't have a domain gate at all. Lei Yu searched the first layer of the palace, but found nothing. There was nothing in the remaining sub-palaces, empty, and even more dilapidated than the first floor.

Ascending through the spiral staircase, Lei Yu came to the second floor of the palace. The style of this palace is the same as that of the first floor, but it is more grandiose. It's just that it hasn't been renovated for a long time, and it looks like the second-story palace is even more dilapidated.

Lei Yu's brows furrowed slightly, his divine thoughts sensed the surroundings, but he found that the Yin Thunder Qi here was getting thicker and thicker, and almost when he took a breath of air, a large stream of Yin Thunder Qi would enter his body, making him feel extremely uncomfortable.

"There's a white skeleton there, someone has been in the second floor of the palace before. A white skeleton appeared in front of Lei Yu, lying on the ground, half of his head had fallen to the side, and only half of his head was still hanging around his neck, and his death was very miserable.

"There have been fights here before, and they are very fierce, and there is a strong smell of blood, and they have not dispersed to this day. Lei Yu looked at the side of the white bone, and there were large patches of blood scattered around. The blood had dried up, was black, and difficult to remove above the ground.

Lei Yu pushed open the door of the second-floor palace, and in an instant, a thick smell of blood came to his nose. There used to be a river of blood here, and there were many strong people who shed blood here, this was Lei Yu's first feeling, and then he saw the scene that made him unforgettable.

The palace was covered with white bones, layered on top of each other, without the slightest gap. In an instant, there was only a layer of seeping white left in front of Lei Yu's eyes. This is a palace completely paved with white bones, and there is a strong resentment gathering that can affect people's sanity.

"At least a thousand people have died here. Lei Yu took a general look, and there was a hint of incredulity in his eyes. Thousands of strong men died here, why is this, is there something hidden in this palace?

Lei Yu was even more puzzled, but he didn't stop. He walked into the palace paved with white bones, and the sound of "squeaking" came and went, and many white bones were trampled by Lei Yu, and fragments were everywhere.

He had a strange feeling in his heart, and all kinds of ideas came flooding his mind, which filled his mind with all kinds of contradictions. The scene here is much larger than the white bone tomb that Lei Yu saw in the Netherworld, but Lei Yu thought of the white bone carving in his heart at this moment, whether this Hell Demon Sect's secret treasure really exists, or is this just a trap, he is really conflicted.

It's just that at this time, he has come to this point, Lei Yu does not intend to give up, but wants to explore the secret.

He walked all the way, stepping on the bones, leaving a path of bones, which was very strange. The palace on the second floor is still very large, but it is also very empty, without the slightest life, which is a little terrifying.

Lei Yu only felt his heart pounding, and he didn't know if the broken white bones he stepped on would form a ghost to retaliate against him. However, the matter had come to this point, and it was useless to think too much, so Lei Yu had no choice but to erase the thoughts in his heart, move forward again, walk out of this white bone palace, and head towards the surrounding sub-palaces.

The secondary palace is a little smaller than the main palace, but it is also very large. As soon as Lei Yu walked into the deputy palace, he was stunned by the scene in front of him. The ground here is stained with a layer of blood, which has turned into a strange black color because of too much time, but the bloody aura in it has not changed, which is very frightening.

"This palace seems to be stained with blood, why is this?" The doubts in Lei Yu's heart were even worse, and his back was cold. Everything here was so abnormal that he wanted to run away for the first time.

Lei Yu quickly walked out of this sub-palace, and soon came to another sub-palace.

Human Skin Palace, this is the second sub-palace that Lei Yu walked into. Just hearing the name, there is a bloody feeling, dark and terrifying.

Lei Yu came to this second sub-palace, his face even paler. As the name of the temple says, it is covered with human skins, which is eerie and terrifying, and extremely dark.

Human skins were hung on shelves, hundreds of them, which had been air-dried, very pale, but exuded an air of horror. Lei Yu's face turned even paler, he was only a fifteen-year-old boy after all, and when he saw this terrifying scene, he naturally had some reactions.

It's just that, soon, Lei Yu adjusted himself and calmed down. Although this human skin hall was terrifying, it was not enough to make him irresistibly frightened. He adjusted his mentality and stepped into the human skin hall.

"The placement of these skins seems to be a certain exquisite, as if they are arranging a formation. Connecting these skins together can form an infinitely powerful formation, and once someone enters it, I am afraid that they will be attacked. "Lei Yu walked around the human skin hall and saw something.

The placement of these human skins is very particular, hundreds of human skins are connected together, gathering the yin and thunder qi here, forming an environment like thunder veins.

"Strange, it stands to reason that after I walked in, this formation should be attacked immediately, why don't I feel it at all now?" Lei Yu's heart was full of doubts, but after thinking for a moment, there was no answer, and he suppressed the doubts in his heart.

"It seems that there is nothing in this human skin hall, so let's go to other sub-palaces. Lei Yu searched in the human skin hall, but he didn't find anything, let alone a clue to the domain gate, which made him a little disappointed, and walked to the third sub-palace.

This sub-palace is smaller than the previous two sub-palaces, but the eerie aura that flows out is the least, Lei Yu is a little at ease, it shouldn't be as terrifying as a few palaces.

He pushed the door open, and the palace was dark, with two human corpses lying on the ground, large patches of blood all around them, which had solidified and showed a black stain of blood.

"These two men seem to have fought in their lives, and judging by their fights, they should have been robbing something before. Lei Yu looked at the corpses of the two and experienced the previous scene, at this time he was not afraid, only a trace of curiosity.

The bodies of two people, a man and a woman, lay on the ground. Among them, the woman held a long sword in her hand and stabbed the man in the chest. And the man grabbed the woman's head with his hands and suffocated the woman to death.

The two of them are completely life-for-life, which is very cruel. There are many blood stains on all sides of the temple, scattered irregularly, and some decorations have been overturned, obviously the two of them have gone through an unusually tragic battle before their deaths, but in the end, both of them died.

"These two people are at least the powerhouses of the Lei Gang period, otherwise it would be impossible for the corpses to be preserved until now. Lei Yu made a judgment, looked at the woman's right hand, and there was a picture scroll held fiercely in her hand, as if the woman was protecting the picture scroll.

"It's pretty tight, and it should be something very important. Lei Yu wanted to take out the scroll, but found that the scroll was held by the woman heavily, and she did not relax at all. He broke the woman's right hand and took out the scroll.

This is a parchment scroll, the size of a palm, very ancient, but it is not damaged because it is surrounded by the aura of yin and thunder all year round.

Lei Yu picked up the parchment scroll and examined it carefully, maybe there was something hidden in the parchment scroll. Otherwise, these two would not have fought like this, and they both died in the end.

"Hell Demon Sect Sect Scroll. When Lei Yu saw the first line of this scroll, he was pleasantly surprised. This scroll turned out to be a detailed map of the Hell Demon Sect, which was very important to Lei Yu.

He searched carefully in the scroll, and soon found its place on it. It's marked with a lot of red marks, and that's some dangerous area. Lei Yu easily found the human skin hall that he had passed before, and a big red color was reflected on it, which was very dangerous.

"Ha Luha, with this parchment scroll, I can quickly find the way out of the domain and get out of here. Lei Yu was very excited, with this sheepskin scroll, it can be said that it is like a tiger with wings, and the help for him is limitless, at least it will not let him wander around in this nine-story palace.