After everything returned to calmness.

The light from the treasure chest also dimmed.

Klein didn't know if it was an illusion, but he felt that the treasure chest in front of him was different.

It seemed to have a mysterious and vague feeling.

It was as though it would disappear at any moment.

[The Realm-Breaking Treasure Chest. After absorbing some mysterious power and with the help of the Cosmos Stone, has the power to break worlds. It might disappear at any moment!]

[System notification: The Realm-Breaking Treasure Chest can be disassembled. After disassembling, there is a high chance of obtaining a magic skill learning scroll.]

Looking at the system notification, Klein's eyes lit up.

'Magic skill scroll?'

'This is a good item!'

It must be known that Klein's two magic skills had increased his strength by several times.

If he had another one, Klein would definitely have a stronger method.

He would have more confidence when he faced the Poison Dragon.

After all, the monsters in the first two floors were already so strong. If the Poison Dragon in the third floor was weak, Klein definitely wouldn't believe it!

That was why Klein had stopped and searched for what he wanted to increase his strength.

But it was extremely difficult!

It was too difficult.

That was because Klein's strength had already far surpassed everyone in the catacombs world.

They had no way of providing Klein with any help.

Be it potions or weapons, manpower or material resources, there was nothing they could do.

This was also the reason why Klein wanted to increase the others' strength.

It was because only when they were strong would he be able to obtain help from them.

Otherwise, it would be very difficult for him to reach a higher realm by himself!

Take, for example, the Devouring Rune Ticket.

If Klein were to search for them himself, how long would it take to find the tens of thousands of wind runes?

You know, even though the drop rate of the bosses he was fighting right now was horrendous...

But to gather that many wind runes was a pipe dream.

So that was the advantage of the exchange. That was what the other people in the catacombs could help Klein with!

Just as Klein was sighing slightly...

The treasure chest seemed to have undergone a change.

An inexplicable energy spread out from within the chest.

Soon, the chest was wrapped.

The wrapped chest emitted flashes of light.

It was as though something was about to happen.

[The Realm-Breaking Treasure Chest is disappearing. Host, please open it as soon as possible.]

Upon seeing the notification, Klein's expression changed.

Then, he hurriedly reached out to grab it.

However, the realm-breaking treasure chest seemed to have gained a bit of intelligence, and it actually managed to dodge him.

"Hmph, how could I let you escape?"

Klein revealed a mocking expression.

Then, he reached out with both hands and grabbed the box.

After grabbing it, the box constantly struggled up and down, trying to escape from Klein's control.

But who was Klein?

A tier 8 powerhouse.

How could a tiny treasure chest break free from his hand?

Therefore, it wasn't long before the treasure chest was completely suppressed by Klein.

After suppressing it, Klein didn't wait any longer and directly opened the treasure chest.

Inside was a strange stone.

This stone didn't have a specific appearance, as though it was a material.

[Cosmos Stone: A material used to repair divine artifacts.]

Seeing that there was no mistake, Klein directly took out the Cosmos Stone.

He didn't expect the Cosmos Stone to be so soft.

It was like mercury being wrapped up.

The treasure chest that had lost the Cosmos Stone completely lost all movement, as though it had lost its soul.

Klein ignored it for now.

Instead, he dragged it and let Little Fox watch. Then, Klein brought the Cosmos Stone to the forging room.

Why was he in such a hurry?

That was because the Cosmos Stone was a liquid item.

Klein didn't have anything to preserve it with, so he could only use it quickly.

Then, he came to the forging room, took out the Endless Sword, and placed it on top. Then, he placed the Cosmos Stone in the material position.

After placing it properly, Klein took a step back.

Then, he clicked to begin the synthesis.

Instantly, the forging began to move, instantly absorbing the Endless Sword.

Before long, the Cosmos Stone disappeared as well.

After a while, the forging room suddenly stopped moving.

Just as Klein thought that the forging was done...

Suddenly, the forging room lit up.

A massive, raging power was emitted from the forging room.

Klein wasn't paying attention for a moment, and he was nearly sent flying by the power.

However, Little Wind wasn't so lucky.

He was struck to the ground by the force and pressed down.

Klein grabbed Little Wind with one hand and placed him behind him as he stared at the forging room.

At that moment, the forging room had completely refined the Cosmos Stone.

After the refinement was complete, the Cosmos Stone turned into a pure-colored energy.

Klein was very familiar with this energy.

But he suddenly remembered what it was.

He saw the energy attach itself to the Endless Sword.

The Endless Sword trembled when it felt the energy.

It was as if it had encountered something terrifying.

But soon, it was enveloped by the energy.

With the last surge of immense power, the Endless Sword was finally refined.

Following that, Klein extended his hand and beckoned, sending the Endless Sword flying towards him.

The instant he held the Endless Sword, Klein's mind couldn't help but jolt.

Instantly, Klein felt a powerful force feedback from the Endless Sword.

Hiss--

"This power is even stronger than the divine artifact from before!" Klein couldn't help but say.

Then, he looked at the Endless Sword's template again.

[Weapon: Endless Blade +8 (Perfect)]

[Rank: Mid-Grade Divine Artifact]

[Physical Attack +991]

[Magic Attack +1,220]

[Casting Speed +60%]

[Attack Speed +30%]

[Enhanced damage increase + 40%]

[After equipping, five elemental attacks will be increased by 60%, and attack power will be increased by 90%.]

[Remark: After absorbing the energy of the Cosmos Stone, the Endless Sword has undergone a sharp change and has grown to a Mid-Grade Divine Artifact.]

Looking at the system template, Klein's eyes lit up.

No wonder he felt that the Endless Sword had become stronger.

It was because the Cosmos Stone had leveled it up!

Looking at the increased damage, Klein couldn't help but smile.

Both magic and physical attacks had increased.

Most importantly, his attack amplification had also increased.

Each attack had increased by 10%.

With that, his melee attack power had increased to 90%.

How terrifying would that be?

Klein didn't dare imagine.

Then, he took the Endless Sword and went outside.

He activated the Power of the Wind, and instantly, countless spells spread to the Endless Sword.

After a simple accumulation, the Power of the Wind on the Endless Sword became even stronger.

The blade also reached six meters.

Not only that, the blade revealed waves of destructive power that even Klein was alarmed by.

Klein estimated that the current Endless Sword's strength had at least doubled compared to before!

"That's great! This way, I'll have more chances to deal with the Poison Dragon!"