The trio descended into the cavern, guarding against possible Ancients along the way.

This creature has the power to create huge dents even from frozen iron plates, which can be imagined to hit people, so even Kakashi, who is a ninja, and Avalanche of Wolf Fangs must be extremely careful.

Urushi and Kakashi were at the front of the line, with Santai Asama in the middle, and Avalanche at the back.

According to Ulusi, the cave does emit a rotten stench, which is not so perceptible to the human nose, but is a strong irritation for the canine with a keen sense of smell.

And the smell is constantly blowing from the depths of the cave, which in turn covers a considerable area of the ice field, making the sled dogs reluctant to approach it.

"There is an air flow blowing outward in the cave, and it seems that there is another exit from this cave." The wolffang avalanche behind speculated after hearing Ulusi's words.

Kakashi and Asama didn't reply, so they acquiesced.

After a while, the three of them and one dog came to a huge cave that looked like an animal slaughterhouse.

There were a large number of animal bones and fossils of sea creatures, and Asama had heard his brother mention it on the radio.

The three of them were not in the mood to stop here to enjoy this shocking scene, so they continued to go deeper into the cave.

A few dozen meters further inside, everyone saw the fossils of the ancients again.

Standing in front of the fossil, the three of them knew what the complete ancient man looked like.

If it is the first time you see a creature like this, your fear may be suppressed by your curiosity and excitement about the unknown.

But when the creature is seen again, any positive human emotions have vanished, especially after seeing the devastation of the camp.

After stripping away these unrealistically positive emotions, all that remains is the most primitive and profound human emotions.

Fear!

Just looking at this lifelike fossil made Kakashi's heart shudder, and his right hand unconsciously touched the kunui, for fear that the fossil would come back to life like a biological sample in the camp.

But a fossil is a fossil, and its function is only to bring tremors to those who see it.

The three of them stopped and watched for a while, facing the ancient creatures that might appear at any time next, so as to prepare mentally in advance.

As he continued to move forward, the flow of gas in the cave became more and more obvious, and Kakashi, who was at the front of the line, could even faintly hear the wind.

As the light increased, the three of them walked out of the cave through another exit.

Standing in front of the entrance of the cave, Kakashi realized that the position they were at was no longer at the foot of the mountain, but halfway up the mountain.

Standing in front of the cave halfway up the mountain, the three of them could overlook the magnificent scene in front of them that they would never forget.

Behind the suffocating black mountains lies a huge basin surrounded by a series of black ridges, and lying in this basin is like an ancient city!

The lines of this ancient city are extremely strange, and many of the edges of the buildings have been crumbled and smoothed, like houses of candles that are gradually melting.

But considering that this is most likely a city built by the ancients, which has endured for endless years in such a harsh icy climate and has not completely collapsed, such a degree of solidity is enough to cause amazement.

These dense complexes form a labyrinth of symmetrical sequences that are almost impossible to see.

Turning his gaze to the black ridge that surrounded the ancient city, Kakashi saw black crevices and regular pentagonal craters scattered across the ridge.

Whenever the wind blows through these craters, the black ridge emits a strange flute sound.

This disgusting gloomy melody continued to wash over the minds of the three of them, as if they had run headlong into the worst nightmare that hung over the shadow of childhood.

In an instant, Kakashi saw his father, Sakushige Hachiki, when he committed suicide, and his own hands could even touch his father's corpse.

Even the icy temperature was exactly the same!

"Kakashi."

"Kakashi!"

Urussi's cry rang out in his ears.

Kakashi quickly took a few deep breaths of cold air and used the cold stimulation that rushed into his lungs to recover from the unbearable memories of his childhood.

Turning his head to look at the two people beside him, Asama Santai and Wolf Tooth Avalanche were also slightly distracted, and they had just recovered.

What does it feel like?

Is this flute an illusion?

But how can there be an illusion that can be recovered so easily?

This feeling is the same as facing the statue of Cthulhu, and there is an indescribable sense of illusion but not illusion, plausible.

But whether it's the Cthulhu statue or the flute of these black mountains, it brings the people who see or hear it to a unified mood.

That's the trembling!

...

Guided by the sleigh tracks halfway up the mountainside, the trio walked into the city built by the ancients.

The desolate ruins of the surrounding buildings show the three of them that the former owner of this place is coming to an end, please don't be afraid, just feel free to go inside.

But all three know that this labyrinthine city is not completely devoid of living creatures.

It is possible that the fourth wife of Asama is still alive, and there are also ancient people who are chasing him.

The trail on the slopes is not only the sled, but also the twisted and irregular striped footprints of the ancients.

The three of them were only a little more vigilant than they had been in the dark cavern before, and they made their way through the city cautiously following the trail of the sled.

In the midst of the city, Kakashi found that in addition to the most common square buildings, there were also giant beehive-shaped fortifications.

This was clearly a fortification built in response to some kind of attack.

The fortifications had been nearly flattened by the wind and snow, and the highest height was no longer than the ridge, and the way they were scattered throughout the city meant that Kakashi felt that they were not very good at defending themselves against enemies from the ground.

Or it wasn't meant to be used to defend against enemies from the ground.

But what made Kakashi even more puzzled was what kind of attack these ancients from the prehistoric world were resisting?

Who in a world where apes were not even born, who could attack their civilization?

Does the existence of the civilization that once attacked the ancients still exist in this world?

...

Following the trail of the sleigh, the three of them came to a giant stone tower.

The top of the stone tower had collapsed, making it impossible to judge the original height of the stone tower, but the arch on the ground had not collapsed, and the three of them could walk in directly.

Entering the pitch-black arch, Urussi shouted a few times and called the three of them to the corner next to the arch.

There are several leftover cans stacked here, proving that Shitsuo Asama stayed here for a while.

But at this time, Asama Shitsuo was not here, and the traces of the sleigh set off again, leading everyone to the abyss at the bottom of the stone tower.