Boom!

The elemental explosion reached its peak.

At that moment, the elements were in chaos, and the world was shaking.

Klein, who was hiding behind the stone wall, could only hear a deafening boom.

If an ordinary person were to hear such a terrifying sound, they wouldn't be able to hold on for even a second. The omnipresent terrifying sound waves would shatter their eardrums in a second, and eventually reach their minds, turning the brain matter inside upside down.

How could they survive such a situation?

Not to mention an ordinary person, even Klein couldn't hold on any longer.

The density of the sound waves exceeded his expectations.

It was as though the world had exploded.

Everything in this world had become the source of sound transmission.

Air, earth, sunlight, and elements.

As such, other than the stirring dust, there were only sound waves that could be seen by the naked eye.

With the wanton bombardment, it was as though the entire world had entered the apocalypse.

As for Klein's eight stone walls, they were currently facing a huge test.

It was just as Klein had guessed.

The first three stone walls didn't last a second as they were instantly smashed to the ground.

The stone walls that were smashed to the ground weren't able to land at all. They were instantly swept up by the aftershocks behind them. As supplies for the impact, they attacked the next defensive object.

Rumble--

The sound was inaudible. Soon, the fourth stone wall couldn't withstand it anymore. Just as it was about to land on the ground, it was swept up again and attacked the next target with an unparalleled aura.

The entire process seemed to take a long time, but it only took a second.

The speed of sound waves was second only to sunlight.

Once it exploded, it would be very difficult to withstand it.

Of course, this didn't mean that Klein's stone walls were weak.

Previously, Klein had only extracted the earth's soil and built eighteen earth walls, and even then, he had managed to withstand a few waves of danger from the elemental explosion.

As for the eight stone walls this time, Klein had used the characteristic of the fusion of metal and earth elements to seduce the rocks in the earth to build a powerful stone wall.

In terms of defense, it was at least ten times stronger than before.

With such a terrifying defense, under the attack of the sound waves, it could only be as weak as a piece of paper.

Thankfully, Klein had prepared in advance and built eight stone walls in one go. Otherwise, Klein would only be able to steel the sound waves.

...

The sound of the stone walls collapsing became louder and louder.

Klein knew that the sound wave's attack was getting closer and closer to him.

However, he wasn't flustered because when the stone wall collapsed, the sound wave attack also weakened.

All he could do now was wait.

It wasn't that Klein didn't want to continue building the stone wall, because neither of the two elements was elements that Klein was good at.

A simple fusion was something that Klein had spent a lot of effort to do.

As a result, the magic power in his body was decreasing rapidly.

If he were to continue building, Klein would probably be drained dry.

It was fine if it was elsewhere.

But now, he was in the Poison Dragon dungeon.

God knows if the Poison Dragon had any backup plans.

If he noticed that Klein was out of magic and launched a sudden attack, what would Klein use to defend himself?

A fire baton?

Indeed, without magic, even if Klein held the Endless Sword, it would only be a fire baton.

As for the close-combat attack method he had practiced previously, it was completely useless in the increasingly powerful catacombs.

After all, Klein didn't have any defensive equipment.

Unless he was willing to use his body to compete with the toughness of a crypt creature...

Of course, that was courting death!

The speed of the sound wave was getting slower and slower.

The sound of the stone wall collapsing was also getting closer and closer.

Finally, the second-to-last stone wall couldn't hold on any longer.

The huge sound wave overturned six stone walls and smashed onto its body.

But even so, it still held on for a few minutes.

But this was also its limit.

With a rumbling sound, the second-to-last stone wall collapsed instantly.

But this time, the sound wave didn't raise the collapsed stone wall.

Not only that, the stone wall that was overturned earlier also fell to the ground with a rumbling sound along with the second-to-last stone wall.

Countless large and small holes were created.

Soon, the final wave of the sonic wave struck.

Countless winds, along with fire, smashed violently onto the last stone wall.

Although the stone wall didn't shake in the slightest, a terrifying sound was transmitted into Klein's ears through the stone wall.

Looking at the stone wall, Klein gritted his teeth. He knew that this was his final defense. If he couldn't withstand it and was exposed to the elemental explosion, Klein would definitely feel terrible.

Therefore, he could only use both hands to cast a spell and press it against the wall.

Instantly, with the support of Klein's magic, the final stone wall quickly stabilized its body as though it had taken an aphrodisiac.

And it wasn't over yet.

Klein knew that no matter how hard the stone wall was, it was still a natural creation. It had its limits.

Only elemental powers could deal with elemental powers.

Therefore, Klein exploded with a large amount of gold elements, instantly enveloping the entire wall.

From afar, the gray surface of the wall emitted a golden light that looked extremely dazzling.

The golden light also strengthened the stone wall.

With the final explosion, the sound wave finally reached its limit.

With a bang, the stone wall's foundation was shaken by the final sound wave.

Klein's expression changed when he heard the sound. He knew that the stone wall's foundation was gone.

Now, he could only rely on himself to block the final wave of impact.

Therefore, Klein had no choice but to release his magic power once again.

If someone was nearby, they would definitely notice that there were countless visible sound waves on both sides of the stone wall in front of Klein. It was filled with boundless anger as it charged crazily at both sides of the stone wall.

After about ten minutes, Klein felt his hand become lighter. He had finally dodged the danger of the elemental explosion!

Then, he released the input of his magic.

Boom!

After releasing the magic, the gold element wrapped around the stone wall instantly disappeared.

The stone wall didn't last long either. After the gold element disappeared, it instantly disintegrated in the air and turned into countless stones that fell.

Looking at the stones that fell, Klein couldn't help but feel a lingering fear.

If he hadn't increased the output of his magic, it was likely that the last stone wall would have collapsed sooner or later.

Once it collapsed, he would have to face the elemental explosion head-on. At that time, his life and death would be uncertain.

However, it was obvious that Klein had escaped.

He could only be said to be extremely lucky.

Klein exhaled loudly and wiped the cold sweat from his brow. 'As expected, the elemental explosion is too terrifying.'

'This time, it's far from the might of the half-step natural disaster from last time. I nearly died. If it was the half-step natural disaster explosion from last time, I'm afraid I wouldn't be able to withstand it for even a second, right?'

Klein couldn't help but think.

As the stone wall collapsed, everything outside was revealed.

Other than the dust that filled the sky, something shiny appeared under Klein's stone wall.

Looking at everything in front of him, Klein's eyes lit up.

'I've struck it rich.'