However, calling it a grayish-black tornado was a little jarring. It seemed like he needed a name.

As a straight man, Klein was very talented in naming.

Soon, Klein's eyes lit up.

"Why don't we call it Whirlwind? An instant-cast foot whirlwind. Those that require a large amount of magic are called half-step tornado of natural disasters."

This name wasn't bad. It was simple and very vivid.

Following that, Klein stood up and with a thought, a Whirlwind appeared in his hand.

In order to research the Whirlwind, Klein nearly blew up the entire catacomb.

Although it was very risky, the final result wasn't bad.

Klein could do one Whirlwind per second with the current one.

Although the damage was far worse than a half-step calamity, it could still reach the level of a Golden Spiral Shuriken.

With this in mind, Klein directly launched his attack.

The Whirlwind that flew out exploded with a stronger wind force than before, instantly creating a huge ravine on the ground.

Feeling the power of the Whirlwind, Klein nodded. It seemed like the Timaeus of Wisdom Necklace had greatly improved his power.

Even the damage of the Whirlwind spell had increased by at least three levels.

Following that, Klein fired another one to experiment with the changes of the Whirlwind spell.

Seeing that Klein was experimenting with the skill, Little Wind and Little Fox ran over curiously.

Looking at Little Wind and Little Fox, Klein continued experimenting with the Whirlwind spell.

After experimenting a few times, Klein realized that something was wrong.

It seemed like the speed of the Whirlwind from condensation to release was too slow.

That's right. This was also a question that suddenly popped into Klein's mind when he looked at the Little Fox.

Although he had been dealing with a large boss and wasn't fast, Klein's skill hit rate was very high.

However, no one could guarantee that he would be able to encounter such a boss all the time.

What if he encountered one that was fast?

For example, the Rogue Archer.

If he hadn't lost the Rogue Archer's Half-High Boots back then, how could it have been so easy for him to defeat the other party?

However, this had nothing to do with the Whirlwind spell.

As it was a wind elemental spell, it was extremely fast.

The problem was probably him!

He wasn't familiar with it, which was why his casting speed had become very slow.

With this in mind, Klein came up with a countermeasure. Then, he told Little Fox his plan.

Little Fox immediately found it interesting, so she nodded.

Then, Little Fox flew out, about a hundred meters away from Klein.

Klein didn't waste any time and immediately began casting spells to attack Little Fox.

The power of Whirlwind was very great, and Klein didn't dare to use it. He could only use the most basic tornado.

After all, the casting patterns of the two were similar. The only difference was the number of spells required.

As for Little Fox, she was very fast. At the very least, she was the creature with the fastest biological clock in the catacombs world that Klein had ever seen.

As long as he could hit her, it meant that his proficiency in his skills could be considered a small achievement.

Therefore, Klein cast a tornado on Little Fox.

Little Fox was very cautious. After Klein activated the first tornado, Little Fox instantly flew out.

However, after she escaped, she realized that the speed of the tornado was too slow.

After trying a few more times, she was even more certain of her opinion.

Therefore, she no longer fled at high speed. Not only that, she even closed the distance between them in a show-off manner.

Her eyes were filled with pride.

Looking at Little Fox's eyes, Klein couldn't help but shake his head. However, he didn't say a word and only focused on stimulating it.

Thankfully, Klein's mana had increased greatly after absorbing the magic core, so he didn't have to worry about the depletion of his magic.

Both sides went back and forth, and the practice was very explosive.

As for Klein, he was constantly trying, and he became more adept at casting skills.

As for Little Fox, she could still provoke Klein in the beginning, but as Klein's casting became more proficient, she gradually couldn't take it anymore. There were a few times when she was brushed by Klein's tornadoes.

As he carefully felt his progress, Klein was very satisfied.

He couldn't help but think that this was the first time he had practiced magic like this, right?

Clearly, he had underestimated magic back then.

In order to cast a spell, it wasn't just the speed of casting, but also the control of mana.

The speed of casting represented the time one had to prepare their skills. If the opponent was a long-range player, the speed might not be the most important factor in such a battle.

But in a close-range battle against a monster, the speed of casting a spell was a matter of life and death.

Not to mention the distance, just take the Armored Scorpion from before.

Back then, the Armored Scorpion had attacked Klein a total of three times. Each time, its speed was extremely fast, and each time, Klein was caught unprepared.

This was especially true for the first time. The Armored Scorpion that had suddenly appeared nearly killed Klein. If not for Little Wind's last attack, Klein might have been in danger that time.

But the reason was that Klein's casting speed was too slow.

It was especially true for ordinary magic attacks.

If he had his current casting speed back then, he definitely wouldn't have been in such a sorry state.

As for the control of mana, it was something that Klein felt when he cast more spells.

Klein realized that the spells he cast each time were different.

Some were more and some were less. That was fine, but the main point was that he didn't have enough control over his spells when he cast them, so there were a lot of wasted spells.

These spells might not seem like much, but when he faced a powerful enemy, it was very likely that it would create an irreversible risk for him.

This was because fighting a boss wasn't the usual practice. It was a life-and-death battle, and every spell was very important. Perhaps the final victory was because he had a lot of magic left.

After learning of his problems, Klein increased the amount of training he had.

Among them, Klein also discovered many of his problems, such as his lack of powerful damage output, the long time it took for him to accumulate half-step catastrophe, the slow speed of the saber beam, and the slow speed at which he brandished the Endless Sword.

After discovering these problems, Klein was not annoyed. He was actually very happy.

Using the classic sayings of his previous world, he trained more during normal times and bled less during battles.

...

Klein trained very hard. In the end, Little Fox couldn't hold on any longer, so Little Wind did it with him.

Little Wind couldn't hold on any longer either, so in the end, Klein could only train by himself.

When there was no more magic, he would meditate to recover.

When he was tired, he would sleep.

Just like that, Klein trained for two consecutive days and finally familiarized himself with the magic in his hands. Furthermore, the speed of casting, the output of the magic, and the swing of the Endless Sword were all greatly improved compared to before.

Although he was still far from reaching his limit, Klein knew that blindly cultivating wouldn't be of much help in increasing the proficiency of his skills.

Furthermore, he had to make preparations for the Poison Dragon.

After all, he wasn't safe at the moment. There was also a mysterious powerhouse that seemed to be at tier 9. Once the other party recovered, he would definitely find trouble with him according to the system notification.

When that time came, he might not be able to stop it by himself!

Therefore, it was imperative to increase the strength of the two beasts!