There are all kinds of huge rocks in this stone forest, with different sizes and shapes, as well as many ancient trees. It is no wonder that there are ancient spirits here as well.

Naturally, Lu Fan had no worries about this.

He directly released the six powerful ancient spirits that he had subdued and controlled, as well as dozens of ordinary ancient spirits, from the system space.

Surrounded by dozens of ancient spirits, they walked straight into the depths of the stone forest.

Whenever they encountered any ancient spiritual trees or ancient spiritual stones, there was no need for Lu Fan and the other two to take action.

These subdued and controlled ancient spirits rushed forward and devoured all the ancient spirits they met along the way.

Lu Fan was too lazy to tame and control these ancient spirits, so he just let them devour each other.

Dozens of ordinary ancient spirits are not as good as one powerful ancient spirit, it is just like raising a Gu.

If all the ancient spirits in the void world were used to cultivate the most powerful ancient spirit, it would be a very cost-effective deal.

In this way, Lu Fan and the other two, along with many ancient spirits, continued to shuttle forward in this stone forest and moved forward for about half an hour.

At this time, the old Taoist priest who was leading the way stopped in front of a pile of huge rocks.

Under the extremely curious gaze of Lu Fan and Tong Lun, the old Taoist priest moved the huge rock in front of him away.

As these huge rocks were moved away, a passage with a diameter of three or four meters suddenly appeared in front of them. It was surrounded by weeds, covering the passage.

After doing all this, the old Taoist priest smiled and said:

"When I was being chased, I accidentally escaped here and found this passage. This passage leads all the way underground..."

The old Taoist priest gave a brief explanation and then jumped into the passage first, followed closely by Lu Fan and the old Taoist priest.

As for the ancient spirits that he had subdued and controlled, Lu Fan gave orders for them to attach themselves to the huge rocks around them.

At the same time, they were asked to manipulate the huge rocks to cover the passage again.

Although it is nightfall now, no one will come here.

But who knows how long it will take them to explore the underground palace.

So just in case, it is better to block this place with huge rocks to avoid any accidents along the way.

After making many arrangements, Lu Fan and Tong Lun followed the old Taoist priest down the winding passage.

After walking through the passage for an incense stick of time, the passage became flat and a light appeared in front.

The old Taoist priest leading the way turned around and said, "We're here."

When the three of them reached the end, the view in front of them suddenly became clear, and Lu Fan was also shocked by the scene in front of him.

All I saw before me was a vast, endless underground space, and what appeared in my sight was the underground palace that the old Taoist priest had mentioned.

The underground palaces are connected to each other, and you can't see the end at a glance, just like an extremely huge city.

The entire underground palace building is shrouded in a layer of barrier, and the existence of the barrier can be clearly seen at this moment.

And the location they are in at the moment is exactly on a protruding boulder on the cliff of this underground space.

It is about four to five hundred meters above the ground below.

Looking at these underground palaces connected together, Lu Fan was greatly shocked, but at the same time, a hint of curiosity emerged.

According to the old Taoist's guess, this void world is most likely a special space magic weapon.

If it is a space magic weapon, how could these underground palaces be built?

The existence of the nine huge cities on the ground and the forbidden land of the void are all very special.

Who would build so many buildings in a space magic weapon?

Just like the Demon Refining Pot and other space magic weapons that I own, I will never build various buildings in them.

After all, magic weapons are just magic weapons.

Unless the space magic weapon is used as a base for one's own forces to accommodate many disciples, perhaps various buildings will be constructed.

But the Void Realm clearly doesn't look like the base of any force.

And this is where he was confused.

He frowned and thought for a long time, but couldn't think of any suitable answer.

I could only shake my head and suppress all these doubts in my heart.

Anyway, the underground palace is right in front of us. As long as we explore it carefully, we will definitely gain something.

After these thoughts flashed through his mind one after another, he took a deep breath and looked at the formation barrier in front of him that covered all the underground palaces.

He had no intention of destroying the formation barrier by force.

After all, they don't know anything about this place, and they don't know the specific significance of this formation barrier.

It would be troublesome if destroying this formation barrier caused any bad consequences.

Anyway, as long as I don't forcibly destroy the formation barrier, I will have a way to enter, so there is no need to worry about anything.

Thinking of this, Lu Fan immediately stepped into the air, and the old Taoist priest and Tong Lun followed closely beside him.

After arriving at the formation barrier, Lu Fan used the power of the system to cover him, the old Taoist priest, and Tong Lun.

Then he raised his hand and pressed it on the formation barrier in front of him, allowing the power of the system and the formation barrier in front of him to merge with each other.

The power of the system can absorb any energy and can also be converted into any energy.

Therefore, there is no problem in integrating into the formation barrier in front of you.

When the power of the system merged with the formation barrier in front of him, Lu Fan's mind moved, and a portal easily appeared in the formation barrier in front of him.

Without any hesitation, Lu Fan, the old Taoist priest and Tong Lun immediately passed through the portal and officially entered the underground palace.

When he withdrew the power of the system, the portal that appeared on the formation barrier automatically restored itself to its original state without causing any trouble.

After entering the area covered by the formation barrier, Lu Fan clearly sensed the terrifying no-fly formation.

If they were not enveloped by the barrier condensed by the power of the system, they would definitely be suppressed by the no-fly zone here and fall to the ground.

Without thinking too much about this issue, Lu Fan and the other two walked into the air and headed towards the nearest underground palace building.

The buildings here are all very tall, almost hundreds of meters in size.

Lu Fan even saw a building that was nearly a thousand meters high, which was extremely magnificent and shocking.

There are not just one or two such buildings here, but they are connected to each other.

If such a series of underground palaces appeared to the outside world, it would definitely cause a shock.

In this way, Lu Fan and the other two walked in the air and soon arrived in front of the nearest building.

This building is a hall about two hundred meters in length, which is considered very tall in the outside world, but it does not seem to be anything special here.

Lu Fan and the other two landed on the steps of the hall. There was deathly silence all around them, not a single sound was heard.

After looking around, the three of them came to the door of the hall, which was engraved with runes.

After taking a look, Lu Fan took a deep breath and pushed the palace door directly into the air.

Boom...

He thought it would not be easy to open the palace door, but as he moved, the two palace doors were opened with a bang.

An indescribable smell gushed out from the open temple door.

It was as if it had been sealed for countless years and was suddenly opened, with a faint smell of decay.

As the palace door was completely opened, the rotten smell finally dissipated.

Lu Fan and the other two walked into the palace.

I saw that the hall was empty, there was nothing inside, not even any decorations.

It's a completely empty temple.

This surprised Lu Fan and the other two, and also made them very confused.

Logically speaking, there should be something here, even some corpse or bones.

The result was nothing.

The three of them used their spiritual sense to search the hall carefully, and indeed there was nothing there.

Such a result disappointed Lu Fan and the other two.

However, the disappointment was fleeting, and the three of them left the hall and headed for another hall not far away.

After all, there are so many buildings here, it is impossible that all the palaces are empty.

With this thought in mind, the three of them came to the second building, which was also a hall.

After opening the door and entering the hall, I found that the hall was completely empty, with nothing inside.

Lu Fan and his two companions, who didn't believe in evil, opened more than a dozen buildings of various types one after another.

But the strange thing is that all the buildings are empty.

There were no decorations, no bones or anything like that, and no abnormalities were found.

After coming out of the sixteenth building, Lu Fan pondered for a moment and immediately turned on the 100 million points detection function.

As the detection function was turned on, the detection power instantly swept in all directions.

He doesn't believe in evil.

He couldn't believe that there was nothing in such a large area of ​​underground palaces, and there was nothing unusual about it.

After turning on the exploration function, Lu Fan took the old Taoist priest and Tong Lun into the air and began to fly in this area.

With the detection function, everything within the detection range is exposed, and the scenes inside each building are clearly detected.

The results of the investigation also made Lu Fan extremely disappointed.

Because all the halls within the detection range were empty, there was nothing there, and no abnormalities were found.

After flying in the air for a while, Lu Fan and the other two finished inspecting the first underground palace.

Nearly a hundred buildings of all sizes were empty and there was nothing unusual.

Since there is no existence or abnormality, why should we use formations and barriers to completely seal this place off?

Lu Fan couldn't understand this situation no matter how hard he tried.

Standing at the edge of this underground palace area, Lu Fan took a deep breath and looked at the underground palace in front of him.

At this moment, this underground palace is also within the coverage of the detection function. When the detection force sweeps through, the situation inside these buildings can also be clearly seen.

"Is there really nothing unusual?"

After muttering to himself in great doubt, Lu Fan shook his head and his eyes became firm again.

He didn't believe there were no secrets here.

The reason why nothing unusual was found must be because the secrets here are hidden too deeply.

Thinking of this, a look of determination flashed in his eyes.

Since the 100 million points exploration function cannot discover the secret here, just turn on the 1 billion points exploration function.

If one billion isn’t enough, then try 10 billion points.

He didn't believe that there was really nothing here.

On the contrary, the more there were no problems here, the more he was certain that there was a secret hidden here, and it was a very big secret.

Just like the secret inside the old Taoist priest’s body, the deeper it is hidden, the more shocking the secret is.

Of course, it becomes more valuable.

Although it takes more points to enable higher-level detection functions.

But as long as you find the secret here, the opportunities and fortune you gain will definitely be more valuable than the points you spend.

Thinking of this, he immediately turned off the 100 million points search function and turned on the 1 billion points search function...