Klein naturally didn't know that someone had guessed that the cave from before was his handiwork.

But even if they knew, it didn't matter.

After all, as the catacombs continued to be opened up, there were fewer and fewer places to explore, so the chances of encountering them naturally increased.

And on Klein's side.

As he stepped into the teleportation portal.

With a flash of white light, he instantly disappeared from the resource cavern and arrived at a very unfamiliar place.

Klein regained his consciousness and looked around.

The area around him was very large, not much smaller than the catacomb he had faced against the Armored Scorpion and the others.

The difference was that this world was filled with boundless poison gas.

He smelled the poison gas that filled the space.

Klein frowned and thought to himself, 'Looks like the situation is more serious than I imagined.'

'This Poison Dragon is probably not easy to deal with.'

Klein had been mentally prepared.

After all, the teleportation portal was equivalent to a dungeon.

To be able to become a single dungeon in a catacomb, it was definitely not bad.

However!

This was also Klein's first time coming into contact with it.

Clearly, the situation in front of him had exceeded his expectations.

However, he had made preparations before coming here.

In addition, he had obtained the poison-resistant fruit from the resource cave.

It could be said that Klein had already reached his limit in his preparations.

Compared to dealing with the Stone of Destruction, the Giant, and the mysterious person, he had already spent a lot of effort.

He had successfully passed the test before, but this time, Klein was very confident!

Then, Klein broke through the black membrane in front of him and walked in.

After entering, the air that was filled with poison instantly spread over.

Klein held his breath and took a small breath.

Instantly, he choked.

Clearly, Klein had not adapted to the environment of the cave yet.

But the good news is that Klein's measurements were high enough.

A large number of circumference directly to the Klein pile into a meat shield.

Otherwise, if it were anyone else...

Not to mention the dragon, he was afraid that even surviving a few minutes here is a big question.

After a few minutes of adjustment, Klein was finally able to breathe.

The air here is very pungent.

Even though he was getting used to it, Klein still felt uncomfortable from time to time.

At the same time, he could also feel the poison gas corroding his body.

Although it was very slow, it continued.

And there was no way to remove it.

It seemed like this was the strength of this catacomb, a special dungeon.

Thinking of this, Klein frowned.

He thought to himself, 'Looks like the Poison Dragon this time isn't easy to deal with.'

'But since I'm here, there's definitely no reason for me to leave empty-handed.'

Following that, Klein took large strides forward.

Apart from the ubiquitous poison gas in this space, there were also many small puddles.

It made the entire world look as though it had just experienced a torrential downpour.

What was different from the outside world was that the torrential downpour was a dense poison gas.

Klein looked at the puddle that was the size of half a basketball court and frowned slightly.

The poison water inside was very dark in color.

Even if he were to encounter it, he would probably be in great trouble.

'Looks like I'll have to be very careful in the future.'

...

After walking for about ten minutes.

With the support of Rogue Archer's Half-High Boots, Klein's speed was very fast.

In reality, he had walked dozens of kilometers.

But this was still not Klein's full strength.

If he were to use his full strength, Klein's speed could be at least doubled.

But even so, Klein still couldn't see the end of the catacomb.

This made him sigh at the size of the catacombs once again.

Suddenly, Klein seemed to see something.

There were more than a dozen mountains that weren't high.

They were about thirty meters tall.

The whole thing was very irregular.

It was as though something had been stacked on top of it.

There were no trees on it.

There was no life, either. It was as though it was a dangerous place.

There was a faint sense of danger in it.

"Should I go?"

Klein frowned.

Then, he looked around.

There was still no end to the catacomb in his surroundings.

Clearly, this was the only anomaly that Klein could discover.

If he didn't go, it wouldn't be that easy to explore the secret of the catacomb.

'I can only go.'

Klein frowned.

Indeed.

He didn't have any good ideas at the moment.

Unless he wanted to continue walking aimlessly.

Otherwise, even if there was a Poison Dragon on the mountain, Klein could only brace himself and go!

Following that, Klein turned his feet and slowly walked towards the mountain where he was.

To be safe, Klein took out the Endless Sword.

And he was prepared at all times.

...

Not long after, Klein came close.

The mountain in front of him was very strange.

This was indeed not a mountain.

It shouldn't be a normal mountain.

Instead, it seemed to have been piled up by something.

Klein moved forward again.

This time, he saw it clearly.

But at the same time, he couldn't help but gasp.

He exclaimed, "A corpse?"

"No!"

"It seems to be the corpse of something."

"And it's not one, but many. I wonder what method someone used to pile them up here!"

Thinking of this guess, Klein didn't feel at ease.

Instead, he raised his head and looked ahead.

After all, there were more than a dozen of such mountains in front of him.

How many corpses would be needed to pile up such a tall mountain?

That was secondary.

The most important thing was...

Why did they do this?

Klein looked around.

There were also many puddles of water near the mountain range.

The poison gas inside seemed to be even more terrifying than outside.

As the sun rose, a lot of water vapor mixed with poisonous gas slowly floated into the sky.

Because of the poisonous gas everywhere, even the clouds in the sky were eroded.

The clouds in the sky were not white.

They were black.

Extremely black.

Even darker than the clouds on a cloudy day.

It was as if once they entered their range, they would drop terrifying poisonous gas at any time.

Similarly, above the clouds, there was a huge sun in the sky.

It wasn't red from the outside world.

It was dark green.

Upon seeing this, Klein stopped in his tracks.

He thought to himself, 'Looks like the danger is here.'

'But where?'

Klein looked around.

'In a puddle?'

He shook his head and answered, "It's too small to hide anything!"

On the mountain?

Klein looked over.

"That's not right. They're all corpses. At least, I don't feel any life."

"It can't be said that way. It should be said that I don't feel any life in this catacomb."

However, Klein didn't believe that a world that could be used as a dungeon was safe.

There was definitely danger.

However, he hadn't discovered it.

Or rather, it hadn't been triggered yet!

With this thought in mind, Klein took another step forward.

Suddenly, Klein stepped on something.

There was a crisp crack.

In this silent space, the crisp sound spread out like a subwoofer.