[The exploration function has been closed, and the 1 billion points spent have been automatically deducted. ]

As the prompt sounded, the detection power of the billion-point detection function swept and spread in all directions.

Soon it covered a distance of 100,000 meters.

With the billion points exploration function turned on, everything here immediately became different in Lu Fan's mind.

An unconcealable smile appeared on Lu Fan's face.

When the old Taoist saw Lu Fan like this, he immediately guessed that Lu Fan must have discovered something.

After all, he and Lu Fan have known each other for a long time.

And the fact was just as the old Taoist priest had guessed, Lu Fan had indeed made a great discovery.

Just now they explored so many palaces one after another, and they were all empty, with nothing inside, and there was nothing unusual.

Even when using the 100 million points detection function, no abnormalities were found.

However, after he activated the billion-point detection function, all the abnormalities that he had not discovered before now appeared in his sight and mind.

These palaces were indeed empty, and there was no existence or abnormality inside.

But these palaces themselves have big problems, and there are huge secrets hidden at the bottom of these buildings.

Because there are a large number of densely packed runes inside these buildings, all the runes seem to be alive.

The bottoms of these rune-covered buildings have lines that look like meridians.

The larger the building, the thicker the lines on the bottom, and the smaller the building, the thinner the lines on the bottom, which is very similar to the meridians in the human body.

Moreover, the patterns on the tops of all the buildings are connected and intertwined with each other, forming an extremely large pattern network.

More importantly, Lu Fan clearly saw energy flowing in these meridian-like lines.

Using the power of detection, he could clearly detect that the energy flowing in these meridian-like lines was exactly the same as the energy that he and Tong Lun had just absorbed.

All the lines are connected to the unknown place in front, including the energy flowing inside, which is also converging there.

And that unknown place is beyond the detection range of the 10 billion points detection function.

But there is one thing Lu Fan can be sure of, there are unimaginable secrets hidden here.

Moreover, the terrifying energy that swept across the entire void world after nightfall was likely to come from the place where these lines converge.

When he thought of this, Lu Fan became more and more excited.

After taking a deep breath to suppress his inner excitement, Lu Fan immediately sent the detected images to the old Taoist priest and Tong Lun.

When the old Taoist saw the images that Lu Fan transmitted, his eyes suddenly shrank and an expression of shock that was difficult to conceal emerged on his face.

"This...what is this!"

"Brother Lu, this is incredible. The secret hidden here must be very big. Perhaps it is the biggest secret of the Void Realm."

Tong Lun didn't feel much.

After all, he came from the dark universe and had seen so many things, so this was not enough to shock him.

What's more, he doesn't care about these things. He only cares about whether he can absorb enough energy to improve himself.

Lu Fan looked at the old Taoist priest's extremely shocked expression, took a deep breath and said:

"Let's go and see what secrets are hidden here."

As soon as he finished speaking, Lu Fan turned off the detection function, and took Lu Fan and Tong Lun into the air, heading towards the unknown place where all the lines converged.

[Ding, the probing function has been turned off, and the one billion points spent have been automatically deducted. 】

After turning on the 1 billion points exploration function just now, he has discovered that all the buildings within the range are empty.

So there is no need to continue wasting time.

Anyway, now we know that the biggest secret is hidden where all the lines converge.

And that is the deepest part of this boundless underground palace.

In the extremely silent underground palace, there was no life and no breath.

Only the sound of Lu Fan and the other two rushing through the air was very harsh in this dead silent underground palace.

After galloping in the air for nearly an hour, Lu Fan and the other two stopped.

Looking at the scene in front of them, Lu Fan and the old Taoist priest were both stunned, with expressions of shock that were difficult to conceal on their faces.

I saw an endless square in front of me.

In this boundless square, there is a huge altar several thousand meters high. It is completely black and its surface is engraved with dense runes.

In addition, on the front of this thousands-meter-high altar, there are densely packed stone sculptures of monks. Their bodies are very huge, all of them are close to a hundred meters in size.

All of these stone-carved monks, each a hundred meters in size, were kneeling on one knee, as if they were worshipping this black altar that was thousands of meters high.

There are a lot of these stone-carved monks, nearly a thousand of them, and they exude a heart-pounding aura.

Fortunately, Lu Fan did not sense any breath of life from these stone monks. They should all be dead objects.

But even so, it was shocking enough.

"Brother Lu, what is the situation with this altar and these stone sculpture monks?"

"Could it be that there is some terrifying existence in this huge altar..."

Faced with the old Taoist priest's doubts, Lu Fan shook his head and had no answer.

After all, it was his first time here and he had no idea about this place at all.

The reason why we can find this place is because of the billion points exploration function.

We finally found this place with the help of the patterns on the bottom of the buildings.

In fact, even if the 1 billion points exploration function is not turned on, we don’t know the patterns underground in those buildings.

They could find their way here too.

After all, this huge altar was not covered or hidden. It stood right in front of us, making it difficult not to notice it.

This is the deepest part of the underground palace and also its final end.

If nothing unexpected happens, all the patterns on the bottom of the buildings and the energy in the patterns should be integrated into this huge altar.

In other words, the secret they are looking for may be hidden in this huge altar.

After these thoughts flashed through his mind, Lu Fan took a deep breath and said in a deep voice:

"Come on, go down and have a look."

As soon as he finished speaking, he brought the old Taoist priest and Tong Lun straight down to the square below.

It was very shocking when watching it from the air.

But when the three people landed in the square, this shocking feeling was amplified again.

Because in this endless square, the three of them were really like ants.

Whether it is the huge altar that is thousands of meters high or the nearly a thousand stone monks that are hundreds of meters high, they are all very oppressive and shocking.

These nearly a thousand stone-carved monks knelt on one knee on both sides like a neat army, leaving a passage several hundred meters wide in the middle.

This passage, hundreds of meters wide, leads directly to a huge altar thousands of meters high.

At this moment, Lu Fan and the other two stepped onto the square and walked straight forward along the passage which was hundreds of meters wide.

Although they did not sense any dangerous aura here, Lu Fan and the other two remained cautious and vigilant.

After all, the more such a place is, the more dangerous it tends to be.

As the saying goes, risks and opportunities coexist. The greater the opportunity, the greater the risk.

The secret hidden here is obviously extraordinary. It would be strange if there is no danger.

In this way, Lu Fan and the other two looked around vigilantly while rushing forward.

After walking for a while, the old Taoist couldn't help but send a message to Lu Fan: "Something seems wrong. I always feel like there is something watching us."

Hearing the old Taoist's message, Lu Fan's eyes narrowed.

Because he felt the same way, but he just didn't say it out loud.

Unexpectedly, the old Taoist priest also felt it at this moment.

That being said, there is indeed something wrong here, and this sense of voyeurism is not false.

But there were no other living beings here except the three of them, so who would be spying on them?

Thinking of this, Lu Fan suddenly turned his gaze and looked at the hundred-meter-tall stone monks on both sides.

"Are these stone-carved monks all alive?"

When this thought popped up in his mind, Lu Fan suddenly lost his composure and immediately urged his spiritual sense to investigate the nearest stone sculpture monk.

After the old Taoist sensed all this, he also activated his spiritual awareness to explore the nearby stone carvings.

However, after the two of them investigated, they frowned at the same time, with confusion in their eyes.

Because their spiritual sense did not detect anything unusual.

There was deathly silence inside these stone-carved monks. There was no sign of life at all, nor any trace of blood or flesh.

Lu Fan also specifically examined the heads of these stone-carved monks and confirmed that there was no soul power or intelligence in their heads.

However, when they withdrew their spiritual consciousness, the feeling of being spied on still existed, and it was much stronger than before.

"What is going on? What is hidden in the dark?"

Unable to find the source of the feeling of being spied on, Lu Fan felt slightly uneasy, and his brows were tightly furrowed.

The next moment, he turned on the billion points exploration function without hesitation.

Spending a few points is nothing, as long as you can find the source of the sense of voyeurism, it is worth it.

He focused his search on this huge square.

The exploration force was focused on the huge altar in front that was several thousand meters high and the stone monks on both sides that were nearly a hundred meters high.

After all, there was nothing else in this huge square except this huge altar and nearly a thousand stone monks.

So the feeling of being peeped comes either from this huge altar or from these nearly a thousand stone-carved monks.

But the next moment his brows furrowed.

Because the power of investigation was blocked by this huge altar, it was impossible to detect the situation inside the huge altar.

Although this situation surprised Lu Fan a little, he was not surprised.

After all, he had encountered many similar situations.

Some special places are indeed not accessible to the billion points exploration function.

Or some extremely terrifying existences cannot be detected by the billion points detection function.

Just like the situation hidden in the old Taoist's body, the 1 billion points detection function detected nothing.

In the end, he upgraded the 1 billion points detection function to a 10 billion points detection function, and only then did he discover the final secret.

However, at this moment, Lu Fan was not in a hurry to upgrade the 1 billion points detection function to the 10 billion points detection function.

Instead, the focus of the investigation was placed on nearly a thousand stone sculpture monks.

As for this huge altar several thousand meters high, there is no rush. After all, this is the ultimate exploration target.

It won't be clear in a short time...