The lines on the walls are not particularly complicated, but they are completely different from any of the formations that the Terrans currently have.

At least there is no energy core source on this pattern.

In other words, its activation does not depend on items such as demon crystals.

"Engraved at the entrance of the cave, and only for the demons."

Yu Sheng pondered for a few seconds, took out his phone, and took pictures of the lines on the wall.

Worried that it might not be possible to restore the core of the formation if it was just a simple photo, he spent the rest of his life evenly smearing ink on the wall and pasting a blank paper to reproduce it completely.

The interior of the bottle had become empty after the previous burning, and it took the rest of my life to spend a whole day in the department store before refilling the equipment.

Putting away the white paper, Yu Sheng turned around and looked inside the cave.

"I'll just say that it's unreasonable to have a slow platform and no cave."

"It should be the movement of the earth's crust, or the passage of time, which obscures the entrance to the cave..."

Yu Sheng whispered softly.

The cave itself is not very large, and there is only a narrow passage to the depths, and the environment is somewhat dry.

"According to common sense, the cave doesn't see sunlight all year round, so it should be wet."

"Is it because the cave is used for habitation, so what measures have been taken to prevent moisture?"

With doubts, the rest of his life kept walking inside.

But the passage is unusually long, and the angle is slightly sloping, more like a constant walk towards the belly of the mountain.

As we deepened, the walls on both sides became more and more flat, and there were obviously some more traces of artificiality.

The rest of his life gradually slowed down, carrying a long sword in his hand, and walked forward slowly.

The cave seemed to be so deep that it didn't know the end, and even the giant flashlight on the shoulder couldn't reach the end.

In the silent passage, only the footsteps of the rest of my life are constantly echoing.

The atmosphere is becoming more and more oppressive.

After walking in this cave for about ten minutes, Yu Sheng's footsteps stopped, looked at a stone wall in front of him, as if he had found something, and his pace increased and walked over.

On the smooth stone wall, people have sketched patterns with sharp objects, like a comic book.

The first...

A bustling scene, a lot of antique buildings, and a constant stream of people on the streets!

It's just that in this scene, there is no technology, including high-rise buildings, buildings, cars, etc., which looks very primitive.

But...

A young boy was holding a leopard in his hand, and the leopard looked very well-behaved, prostrate on the ground, and let the child stroke its forehead.

According to the size of the body, placed in the demon domain, at least the level of the third level.

Not far away, a middle-aged man dressed in ordinary clothes was riding on the back of a tiger with cloth bags hanging from his waist, which seemed to be full of goods.

That huge body, starting at the fifth level!

And this scene seems to be seen everywhere in the streets, just like before the revival of the aura, the people walked their dogs, raised cats, and rode horses.

It's just that their pets look some... Violent!

The tallest building in the picture is a small three-story wooden building.

On the terrace outside the third floor, there is a young man, although it is only a few simple strokes, but it still sets off the young man's dusty temperament, which is obviously different from everyone on the street.

The young man carried his hands behind his back, looking down at the street, a long shirt swaying in the wind, and his long hair was also blown up by the wind.

The style of the second mural begins to show a little sharpness.

The youth seems to have grown into middle age.

The temperament is introverted and does not show the edge.

He stood on top of a city, and the city carved a plaque, but the words on it were unknown to the rest of his life.

Inside the city, those people looked a little nervous, but when they looked at the middle-aged back, there was a look of faith in their eyes.

And outside the city, there are also countless people.

These people all rode on top of monsters, armed with weapons, as if they were going to attack the city.

The third mural.

The city looked a little dilapidated, but in the end it was defended, and the middle-aged man sat alone at the head of the city, his robe still swinging in the wind, but his long hair was scattered and casually draped over his shoulders.

He carried a flask in his hand and took a sip!

Below, there are dense corpses, human and beast...

The people of the city rebuilt their homes.

Although it looks a little miserable, the picture highlights a kind of warmth.

Yu Sheng did not rush to look back, but took out his mobile phone, pointed at the murals, recorded them, and carefully analyzed the details revealed in the murals.

First of all, in the mural era, there were no demon clans.

Those so-called powerful monsters are only slaves of 'humans', used as pets, transportation, or tools of war.

Of course, although the existence of these ruling demon races seems to be exactly the same as that of humans, perhaps they also have their own unique names for themselves.

So the word 'human' is in quotation marks.

And it can also be analyzed through the murals, they have not studied science and technology, but simply followed the path of cultivation, and the overall cultivation strength is not weak.

At least if you want a level 5 tiger to honestly carry goods for you, it is difficult to do without absolute strength.

But this is just a middle-aged man walking casually on the street.

It's hard to imagine how strong 'humans' were at that time, or what the world outside the city was.

Judging from the three known murals alone, it is already full of shock.