After trying it a few times, Klein suddenly thought of something.

'What if I combine the Vacuum Strike and the Power of the Wind?'

First, the Power of the Wind would enhance Klein's melee attacks. After channeling it, the Endless Sword would grow to a height of three to four meters.

From afar, it looked like a gigantic lightsaber.

As for the Vacuum Strike, it would release its initial size according to the size of the weapon in the host's hand.

If he used the Power of the Wind to increase the size of the Endless Sword before using the Vacuum Strike, how terrifying would the power and size be?

With this in mind, Klein's eyes lit up.

Magic was very compatible.

This also gave Klein the idea to give it a try.

Of course, most importantly, Klein's current magic attack methods were very limited!

He had no choice but to make rational use of every spell he had.

Then, Klein took out the Endless Sword and used the Power of the Wind.

Instantly, countless spells swarmed out, increasing the attributes of the Endless Sword.

In just a few seconds, the Endless Sword emitted a light of three to four meters.

This wasn't light to be underestimated.

It was extremely powerful.

It could even cause physical attacks that weren't any weaker than the original body's.

After casting it, Klein cast the Vacuum Strike again.

However, at this moment, Klein's heart couldn't help but beat.

This was because magic was very inclusive.

But Klein was, after all, a rookie magician.

Although he had received a large amount of magic knowledge, it was only limited to wind magic.

Klein still didn't understand other spells, such as gold, fire, earth, water, and so on.

As for the Vacuum Strike and the Power of the Wind, although they were wind elemental spells, they had fused with many spells.

For example, the Vacuum Strike carried the sharpness of the metal element.

And the Power of the Wind also carried a portion of the burning of the fire element.

Therefore, the release of spells wasn't as simple as one plus one.

Instead, it was the accumulation of multiple spells.

If there were any problems with the operation, or if the spells were incompatible, the danger of the Endless Sword exploding might occur.

Of course, what supported Klein's actions wasn't just his interest.

It was also because he believed that it could become a trump card.

That was because if he couldn't use the Power of the Wind to perform the Vacuum Strike, then he would seize the opportunity to release the Vacuum Strike when he was facing his enemy. He could only make the Power of the Wind dissipate.

Only after it dissipated could Klein use the Vacuum Strike.

But after he finished casting it, the Power of the Wind entered a cooldown period.

Then, this round would give Klein at least a few seconds of a vacuum period.

It would have been fine if it were any other time, but against a powerful boss, every second was very important.

Once the other party seized the opportunity, even Klein might not be able to withstand it.

Therefore, regardless of which aspect it was, Klein had to figure out whether or not the two spells were fused.

Then, Klein took a deep breath, picked up the Endless Sword, and silently recited the magic mnemonic for the Vacuum Strike.

As Klein recited the magic mnemonic, the blade glow on the Endless Sword began to flicker, like a candle flame in the wind. Fortunately, there wasn't much of a problem.

Soon, Klein began to input spells.

This was the most crucial scene.

Klein was very careful and inputted very slowly.

This was because once there was a problem of incompatibility, Klein could cut off the input of magic at any time.

This way, even if there was danger, the damage that could be done would be very limited.

But what Klein didn't expect was that the Power of the Wind didn't have any reaction.

It was as if the two types of magic were incompatible.

Each walked their own path, and neither of them interfered with the other.

Upon seeing this, Klein couldn't help but heave a sigh of relief.

It seemed like he was overthinking things.

He thought that all magic was saber beams that he had researched.

He mixed them together and smashed the enemy to death.

Clearly, this magic was very stable and considered all sorts of problems. Therefore, when Klein cast it, there was no danger of the magic exploding.

But suddenly...

"Not good!"

The blade light of the Endless Sword swayed even more violently.

Sensing the spell in the Endless Sword, Klein's expression changed drastically. He was still maintaining the spell of the Power of the Wind. Therefore, when the Endless Sword rippled, Klein immediately sensed it.

His output speed was too fast, resulting in the collision of the spells. If Klein hadn't stopped in time, a terrifying elemental explosion might have happened.

But thankfully, Klein stopped.

He canceled the Power of the Wind and the Vacuum Strike.

Klein carefully considered the reason.

There wasn't a problem to begin with.

It was because the speed of his input was too fast, causing the spells to collide.

But this wasn't the fluctuation from the collision of spells.

It was because the spells that maintained the Power of the Wind and the spells that produced the Vacuum Strike were spells from Klein's body.

These magic elements had been purified, so they were very tolerant towards spells of the same origin.

Therefore, Klein's guess was correct. There had indeed been no explosion of magic elements.

It seemed like the real problem was that he didn't have a good grasp of the number of spells that produced the Vacuum Strike, resulting in the sudden impact on the form of the Power of the Wind, resulting in the collision of spells.

Thinking of the reason, Klein nodded.

He took out the Endless Sword again.

This time, Klein was very careful.

It was time for the output Vacuum Strike again.

Klein was fully focused on experiencing the number of spells that could be used to input the Vacuum Strike.

The process was very smooth, and the Vacuum Strike was still taking shape.

Above the three to four-meter-long saber beam, a sharp Vacuum Strike appeared.

But it was still very blurry because Klein was still trying, so he wasn't in a hurry.

But at that moment, an accident happened again.

As it condensed, the Vacuum Strike went berserk.

The power of the berserk was immense, making Klein unable to grab the Endless Sword.

He had no choice but to clench his teeth and press down hard.

Then, he used all his strength to stabilize the two spells on the Endless Sword.

Soon, the magic riot was suppressed.

And at that moment, the Vacuum Strike slowly revealed its specific shape.

Seeing this scene, Klein heaved a sigh of relief.

It was difficult at the beginning, after all.

Especially for a rookie like him.

But as long as he succeeded once, the rest would be easy.

Therefore, Klein continued to manipulate the Vacuum Strike to form a spell. This time, it was very smooth.

Before long, an eight-meter-long Vacuum Strike appeared in front of Klein.

Looking at the Vacuum Strike in front of him, Klein couldn't help but reveal a delighted expression.

He had guessed correctly.

Indeed, the height of the weapon determined the height of the Vacuum Strike.

In other words, the Power of the Wind was three to four meters, while the height of the Vacuum Strike doubled according to the Power of the Wind, reaching eight meters.