The underground palace is located under a crack on the surface of the earth. The crack is very close to the volcano. Because of the previous volcanic eruption, no one had the chance to enter the underground palace.

A few days ago, the volcano became peaceful, and people began to enter it one after another. However, the temperature around the underground palace was extremely high, and there was poisonous gas emerging from the underground magma. Those with insufficient cultivation would not be able to stay underground for a long time.

After discussion, Piao Miao Immortal Palace only allowed disciples above the Dan-formation stage to enter the underground palace, and the remaining disciples patrolled around to see if there were any secrets around.

Muchen was originally not qualified to enter the underground palace, but Muchen asked Bai Lingyun to take him with him. Bai Lingyun had promised Muchen a long time ago and owed Muchen a favor, so he naturally could not refuse.

"After entering the underground, you...must stay with me at all times, do you understand?"

"Yes, yes, you have said it several times. I just went down to take a look. I will gain experience and won't mess around."

Muchen agreed to Bai Lingyun's request.

Bai Lingyun handed the Bai Yuxia Phi that he had taken out before to Muchen and said, "You... put this on."

"Wait a minute... aren't these clothes warm? If you wear this underground, will you get too hot?"

"Get out! This is a treasured garment, invulnerable to water and fire!"

Muchen looked at it curiously, wondering which one had stronger defense power compared to his own suit.

Since it was Bai Lingyun's good intention, Muchen was too embarrassed to refuse.

Bai Yuexin, on the other hand, glanced at Muchen with a strange expression, and then at her aunt.

Everyone gathered and looked at the steaming crack not far away.

Wan Bing took the lead to walk out and said: "Today, we will enter the underground palace according to our own abilities. I hope you will do your best."

Yao Yue looked at Wan Bing with charming eyes and mocked: "Do you want to do this for yourself? Could it be that Elder Wan Bing is threatening the slave family... The slave family is so scared. If the slave family had obeyed Elder Wan Bing, wouldn't it be better?"

"Witch, what are you talking about? What does this have to do with you?"

"Oh... Elder Wan Bing is really cruel. The Nu family... is really looking forward to Elder Wan Bing's glory!"

Yao Yue has always had a reputation for being incompetent, and there were even rumors that Yao Yue was related to the entire Lei Yan Sect's senior leadership, causing the Lei Yan Sect to lose face.

Of course, this was all intentional by Yao Yue. She had a big feud with Lei Yanzong, so she naturally tried every means to disgust Lei Yanzong, even if it meant sacrificing her entire reputation.

However, Yao Yue's acting skills are absolutely top-notch. If she says her acting skills have nothing to do with Wan Bing, then that's nonsense.

Lei Heng couldn't stand it any longer and shouted angrily: "Witch, don't talk nonsense here."

"Oh, the young sect master must be jealous. Don't worry, the Nu family likes the young sect master's might even more. The young sect master is much more powerful than Elder Wan Bing!"

"You!..." For a moment, Lei Heng didn't know how to refute. They couldn't defeat Yao Yue because Yao Yue had nothing to lose.

Wan Bing stopped Lei Heng's impulse, ignored Yao Yue, looked at Lu Ya and said, "Mr. Lu, let's go down and open the underground palace."

"good."

Seeing that Wan Bing and the others were not fooled, Yaoyue also lost interest.

On the contrary, the flame demon behind him said: "Madam of the sect master, please pay attention to your words and deeds. You are now the ghost king's woman."

"Ha... you can tell that the Ghost King's woman is his official wife. My existence is dispensable. Elder Yanmo is overly worried. The meaning of my existence is to bring down the Lei Yan Sect."

Yan Mo stopped talking, and Yao Yue was right.

Wan Bing and Lu Ya jumped into the crack first, and the others quickly followed.

Muchen was carried by Bai Lingyun and jumped down because Muchen could not fly.

As it fell all the way, the temperature in the crack suddenly increased, and the surrounding area was red lava hematite. This is a very good material for forging weapons, but because the melting point is too high, it is not easy to cast.

The cracks are deeper than imagined, at least several kilometers long, and black air masses are constantly emerging from the ground. The black air contains a large amount of poisonous gases. If too much is inhaled, even the masters at the Xudan stage will not be able to bear it.

The closer you get to the underground, the higher the temperature. Everyone must always use their true energy to protect themselves, which invisibly increases the consumption of true energy.

As we get closer and closer to the magma, the cracks actually become wider. The originally narrow cracks can easily accommodate more than a hundred people entering and exiting at the same time.

The further down you go, the wider the space becomes. When everyone gets closer to the hot lava, they discover an underground world.

This underground world is very quiet, there is no sound around, there is only hot lava bubbling there, and when the hot bubbles burst, terrifying high temperatures will be released.

No one can stay in such a terrifying environment for a long time.

Everyone looked around and discovered that there was a manually excavated walkway on the rock wall not far away.

Everyone walked along the wall, and everything along the way was red. The entire underground palace was like a steam oven, everything would be cooked in an instant. If it weren't for the true energy to protect the body, I believe many people would have died by now.

The white feather shawl on Muchen's body is indeed a treasure. It can completely isolate the heat. Muchen seems to have his own mobile air conditioner, which is really warm in winter and cool in summer.

Moving forward, everyone soon arrived at the gate of the underground palace.

The gate of the underground palace is located on a rock wall. There is a strong barrier around the rock wall, and below is the hot magma. This Lord of the Sun really knows how to find a place.

The gate is blocked by a barrier, and everyone can only enter with a key. If the barrier is forcibly broken, it will inevitably affect the structure of the underground rock wall. If not, everyone will be buried underground.

This means that if a war breaks out, everyone will not be able to use large-scale AOE spells. Once the underground structure is destroyed, it will be impossible for everyone to escape thousands of meters underground.

Looking at the gate of the underground palace ahead, Wan Bing said: "Ahead is the entrance to the underground palace. There are three grooves next to the door. As long as you put in the key, you should be able to open the underground palace."

Walking into the gate of the underground palace, Muchen found many strange characters engraved on the door. Muchen recognized that these were ancient seals and the most primitive characters in the world.

The gate is also engraved with special marks exclusive to the Lord of the Sun. It is through these marks that later generations judge that this place is the residence of the Lord of the Sun.

As for the meaning of the seal engraved on the door, it is: "The way of heaven is unfair. If you ask for it, you will not get it. My wish will be inherited by those who can."

"I didn't expect that this True Lord of the Sun actually knew the ancient seals. Could it be that... he had also studied the seven volumes of the Book of Heaven? Or did he know the secrets of the ancient relics?"

The ancient seal was left by the first generation Yuan Zun. All the family members left by Yuan Zun are familiar with this seal. However, Yuan Zun's family only exists in legends and few people in the world have seen it.

Most of the truly remaining printed documents were preserved by the four ancient powers.

Among them, the seven volumes of "Book of Heaven" are the most complete ones, recording Yuan Zun's understanding of the laws of heaven.

There are also some idle books left over from ancient times. In order to decipher the secrets contained in them, the four ancient forces have been searching for documents written in this cipher text.
Chapter completed!