With this in mind, Klein knew that he couldn't hesitate any longer.

He was being poisoned every second in this world.

Once it reached a certain level, he would definitely die.

Therefore, the most important thing now was to find the Poison Dragon and kill it.

Following that, Klein's feet left the ground and flew up.

But just as Klein's feet left the ground...

Suddenly...

Boom!

The three-meter-wide ground beneath his feet seemed to have been attacked by something and instantly collapsed.

But what Klein didn't expect was that...

The collapsed ground didn't fall into the lake.

Instead, it seemed to be swallowed up. Bit by bit, it was wrapped up.

It felt like throwing sugar cubes into rice paste.

There was a popping sound.

"This isn't lake water?"

Klein suddenly realized.

Then, the magic in his hand rolled as he released the Golden Spiral Shuriken and blasted it down.

The Golden Spiral Shuriken whizzed down.

However, it didn't explode as expected.

Instead, when it came into contact with the surface of the lake, it was instantly entangled by countless sticky things.

Then, it was slowed down at a speed visible to the naked eye.

Before long, the entire Golden Spiral Shuriken was completely devoured by the sticky things.

Finally, there was a pop at the bottom of the lake. Before the waves even stirred, it had completely disappeared.

Upon seeing this, Klein frowned.

'I never expected the poison gas here to be so terrifying. It has already materialized.'

'In that case, the poison gas in the air must have come from this.'

Following that, Klein looked around.

At this moment, a gust of wind blew past, dispersing a lot of the fog in the world.

Klein's field of vision also widened.

What entered his eyes was a poisonous lake that stretched as far as the eye could see.

What was strange was that the seemingly endless poisonous lake seemed to be stagnant. There were no ripples or movements.

"Where's the Poison Dragon?"

"Could it be that this world is over?"

Klein couldn't help but guess.

Why would he think that way?

It was because the geology of this world was too dilapidated.

Even the Bloody Figure from back then wouldn't be able to survive, much less Klein.

As the fog dispersed, Klein's field of vision expanded.

At that moment, he saw the true color of the fog.

It was green.

It was a fog formed after countless toxic gases were evaporated.

Looking at the endless fog in front of him, Klein couldn't help but feel his scalp tingle.

Just how much toxic fog was produced in this world?

Even if the sun in the sky was constantly evaporating, it would take hundreds or thousands of years to reach this level, right?

However, the only problem was...

After reaching this level, would the poisonous lake still exist?

Obviously not.

Then, how did it happen?

Klein was very puzzled, but at the same time, he became more careful.

Then, a gust of wind blew past.

It wrapped around the countless poisonous fog and flew in all directions.

The wind seemed to become stronger.

From afar, the countless poisonous fog seemed to be stirred, forming a terrifying fog wave.

It immediately attacked Klein.

Klein's expression didn't change.

He had already sensed that there was no danger.

The greatest danger was the poisonous fog.

However, the poison fog didn't do much damage to Klein.

Following that, Klein brandished his Endless Sword and dispersed the poisonous fog.

But soon...

The poisonous lake attacked.

This time, the poisonous fog was even larger.

Not only that, he could faintly smell it as though it was extremely pungent.

'What on Earth is it?'

Klein's expression changed.

He was too passive.

Furthermore, the wind was very strange, as though each one was bigger than the other.

If this continued, it wouldn't be long before the wind became something he couldn't deal with.

'If that's the case, I can only do this.'

With this thought in mind, Klein picked up the Endless Sword.

The wind magic in his hand continued to accumulate.

Then, he slashed down towards the center of the poison lake.

Instantly, countless fog, driven by Klein's wind magic, frantically rushed towards the center of the poison lake.

And at that moment, Klein also saw the center of the poison lake.

Hiss--

"What a huge mountain!"

Klein frowned.

At the end of his line of sight, there was a huge mountain that connected to the catacomb.

The mountain was extremely lofty, like a sharp sword that pierced through the sky of this world.

At the same time, it blocked the ground of this world.

It was like the Pangu in the legends.

One hand held the sky while the other stomped on the ground, trying to push open the sky!

"It looks like this mountain has something it's looking for!"

With that said, Klein flew towards the mountain at high speed.

However, the distance of the mountain exceeded Klein's expectations.

It didn't look far, but when he really approached it, he realized that the mountain in his line of sight was always so tall.

"This is a dead horse running at the sight of the mountain!"

Klein laughed at himself.

Nowadays, the more powerful the boss he had experienced, the larger the catacomb would be.

Therefore, it was very troublesome to move around.

Fortunately, Klein could fly after reaching tier 8. Otherwise, just by relying on magic, even if Klein arrived, the magic in his body would have been used up.

After walking for about half an hour, Klein could finally see clearly.

'This isn't a mountain!'

'No!'

'It shouldn't be a normal mountain.'

'A normal mountain will have trees, bushes, and, at the very least, a mountain full of soil.'

'But what about this mountain?'

'It is completely bare.'

'There is nothing but countless strange rocks and cliffs.'

The most surprising thing was that the mountain was also green.

As Klein got closer, a huge sense of danger filled Klein's heart.

For a moment, it felt as though a few hundred kilograms were weighing down on Klein's heart. It was extremely uncomfortable.

And most importantly, this feeling couldn't be dispelled.

'It looks like the Poison Dragon I'm looking for is indeed up here.'

'But? Where is it?'

Klein slowly leaned forward, his eyes constantly scanning the area.

But the mountain was too high.

Klein couldn't see the top at all.

In addition, there was a lot of fog pervading the mountain, so the area that Klein could see was very limited.

As for why he didn't cast a wind spell to drive it away...

It was because he didn't want to alert the enemy!

Klein thought so, but the wind didn't seem to be as relaxed as Klein.

Soon, another gust of wind blew over.

This time, the wind was even stronger. The countless fog in front of Klein seemed to be in an uproar.

There was a whimpering sound in the air as the sea of clouds rose and danced up and down. It looked like it had absorbed the fog.

Then, it frantically rushed towards Klein.

Klein naturally didn't dare to let the fog get close, so he could only wave his knife to disperse the fog in the sky, but it didn't have any effect.

Not only that, Klein's actions seemed to have alarmed something.

In an instant, the fog became heavier.

Amidst the dense fog, a huge eye appeared!