“Let’s go.”

The Invincible Fist Sage retracted the flames on his body. He looked ordinary. Who would have thought that the terrifying and deity-like phantom of a flaming giant just now was the power unleashed by the Invincible Fist Sage?

Every Sage was extraordinary, far surpassing Meta-divine martial artists.

Originally, when Lin Feng had the Tidal Combat Body and even fought with the Guardian, he had felt that the combat power of a Sage was only so-so. However, that was only the combat power of a Sage, and not a true Sage.

Lin Feng had never actually seen a true Sage unleash his full strength. And now, the power unleashed by the Invincible Fist Sage was simply earth-shattering, shocking even Lin Feng deeply.

To be able to create such a huge hole at once, in terms of strength alone, Lin Feng would have to at least deploy a combat body of over 200 meters.

Hence, Lin Feng also put away his underestimation of Sages. Perhaps the Sages did not have a cosmic cultivation system or a combat body, but the martial arts system that Sages cultivated was revised extensively by humans. Having gone through continuous improvement from generation to generation, the cultivation method that was more suitable for humans had its unique advantages.

“Go!”

The Invincible Fist Sage led Lin Feng and jumped straight into the deep and pitch-black hole. A cold wind blew inside, and it was vaguely cold. Moreover, it was very dark and visibility was very poor.

However, both Lin Feng and the Invincible Fist Sage had night vision. This pitch-black hole did not affect them much.

The huge hole seemed to extend straight down, like an abyss. The two of them did not know how long they had been falling for. Slowly, they sensed that there was some humidity below, but it came from the ground.

After Lin Feng landed at the bottom of the cave, he looked up. He could only vaguely see a beam of light, like a star, but he could not see the cave entrance at all. It was enough to show how deep this huge cave was.

“Be careful. This is probably the sixth grotto.”

“The sixth grotto? Didn’t we enter from the first grotto?” Lin Feng was a little surprised.

“Heh, there are 18 grottoes underground. After so many years, the markings have all disappeared. Who can remember the order of all these grottoes? Every time I want to enter the Eighteen Grottoes of Dragonhead, I smash a huge hole and jump right in. Naturally, there would be some deviations. Fortunately, it’s only the sixth grotto. The deviations are not too large.”

Lin Feng was a little speechless. This was a Forbidden Place. The Invincible Fist Sage seemed to be… well, a little too imprudent…

Regardless, they had already entered the grottoes.

The grotto was bare and full of collapsed rocks. However, there were some murals on the walls. Even though they were very ancient and looked very mottled, one could vaguely see part of them.

There were no words on these murals. They were all strange paintings. For example, there were some terrifying behemoths with six heads and twelve arms.

There were also human-headed centipedes and some seductive goddesses.

These murals were full of a mythological aura.

“Isn’t this a religious site of ancient humanity?”

Lin Feng was a little surprised. These murals must have been painted by people, and they had such a strong mythological sense.

“No. When I entered the grotto previously, I had also seen these murals. I even took some photos for some historians to study after getting back. They unanimously agreed that these are definitely not religious murals from ancient humanity!”

“Moreover, some of the rock elements on the mural were appraised. The results of age appraisal may surprise you. These rocks are probably more than 300 million years old!”

Lin Feng was shocked. Humanity had not yet appeared 300 million years ago. After all, the human civilization had only existed for a few thousand years. Even counting the time humanity appeared, it had only been a few million years.

It was impossible for them to have a history of 300 million years, no matter what.

Unless this was left behind by an ancient civilization.

“An ancient civilization?”

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Lin Feng’s eyes narrowed slightly. He had already seen the third and seventh civilizations, both technological civilizations. As for other civilizations, he had really never seen them before.

“That’s right. According to our analysis, this should be a ruin left behind by an ancient civilization. Moreover, there are no traces of technology in the grotto at all. This means that this is not a technological civilization. Civilizations which are not technological civilizations are often more dangerous. We have to be careful.”

The Invincible Fist Sage appeared very cautious. The two of them slowly walked deeper into the grotto.

The inside of the grotto was very humid. For some reason, not only was it humid, it was also very stuffy.

Following the murals in the grotto, Lin Feng and the Invincible Fist Sage slowly walked forward. Suddenly, the space ahead opened up, and a huge hall appeared.

There was an altar in the hall, as well as thick stone pillars. There were also some stone chairs below, but they had all disappeared due to weathering. The entire hall had an ancient and desolate feeling.

Rumble.

Suddenly, the grottoes shook violently again. The ground shook, and the inside of the grottoes seemed to almost about to collapse.

“The source of the quaking is still down there.”

The Invincible Fist Sage immediately sensed it. The source of the quaking should not be in the sixth grotto, but further down. It was still some distance away from the sixth grotto.

However, the shaking became more and more intense. Suddenly, a strange stone sculpture on the altar collapsed.

Bang.

The stone sculpture shattered, and black beetles crawled out of it. What was even stranger was that there were blood-red patterns on the black beetles.

“Whoa…”

These black beetles practically grew upon contact with air. In a few breaths, they had already grown to the size of babies one or two years old. They looked very sinister and terrifying.

“Be careful, don’t let them touch you!”

These black beetles flew directly towards Lin Feng and the Invincible Fist Sage. The Invincible Fist Sage extended his hand, and a ball of flames flew out, enveloping dozens of beetles and igniting them.

Squeak. Squeak. Squeak.

“Eh, they can’t be burned to death?”

The Invincible Fist Sage was a little surprised. These beetles actually charged out of the encirclement of flames and flew towards the Invincible Fist Sage in a frenzy, as if they were not afraid of the flames.

However, how could the Invincible Fist Sage only have flames at his disposal?

He extended his hand, and boundless Astral Power quickly gathered before he struck hard.

Boom.

The ground shook, and a huge pit was formed on the ground. The black beetles that were struck had already turned into a puddle of flesh and blood.

Lin Feng did not kill these beetles. His body suddenly expanded, instantly growing to more than ten meters tall. Then, he grabbed with his hand and caught all these beetles.

“They are corrosive and highly toxic.”

Lin Feng sensed that his combat body had been damaged. Although it was very, very little, it was indeed damaged. These beetles were highly toxic.

He did not hold back anymore. With a casual squeeze, he easily crushed these beetles.

Rumble.

At the same time, an even more shocking scene appeared. The tall and strange sculptures around the altar seemed to have been triggered. One by one, they began to emit a green light, as if they had “come alive”. Rapidly, they transformed into ferocious monsters, glaring menacingly at Lin Feng and the Invincible Fist Sage.