The next day, Kai finally started his training. It wasn't something big from the beginning, just testing some things for his new magic. After all, the concept was there, but not the execution.

To do this, he specifically asked his teacher for the training world because he felt he might be injured from this training.

When a week passed, Ria Ross came to him with a sword. The sword looked the same as his current sword, but the materials had been changed. The color was more apparent since it became a green sword instead.

"Teacher, this is…"

"Yeah. That's your Sword. Since you are here, I have been working faster than I can imagine." She smiled. "Take care of that sword, will you? That's the best one I have ever worked on. I don't think any weapon can match the hardness of this sword."

"Of course. I will be a fool if I don't. Well, that is if the sword can withstand the pressure coming from the Sonic Boom."

"Have you figured out the magic?"

"The basics are there. I just need some tweaking. You want to see it?"

"Sure. I am curious. I will make sure to watch out the weapon that might kill me in our battle." She smirked. "I don't want to lose to a brat like you."

"Nope. You are going down." Kai shrugged as both of them went from the study room to the training room.

Inside there was a huge monitor and some devices to control the virtual world just like those in Graham Family's mansion.

"Do you have any specific place or environment you want to request?" She asked.

"Nope. Just a normal one. I don't mind if it's just a basic white room." Kai shook his head. "Later, I want to see whether the wind or any other elements will affect my magic or not."

"I see. For now, I will input the data of this sword first, so you can summon it in the virtual room." She nodded and began typing for a few minutes before pointing at the training tubes. "Choose any of them."

There were five training tubes. That was why she let him choose.

Kai nodded and took the left one, the one that he used when he fought against Ria Ross.

"I have used the data of our real world to make sure that the Sonic Boom and other phenomena appear as how everything is supposed to be."

"I understand. Thank you." Kai nodded with a smile while entering the training tube.

"Alright. Transferring."

Kai closed his eyes, and his consciousness teleported inside the white room. A huge screen then appeared in front of him where he could see Ria's figure.

"I will remain by your side until this training session finishes to make sure that nothing goes wrong. Are you fine with that?"

"Yeah. Please take care of me." Kai nodded.

"This is your sword." She said while summoning his new sword.

Kai felt the sword first to check the difference between the real sword and this virtual sword. Fortunately, Ria's skill was top-notch as she managed to replicate it perfectly.

He then closed his eyes for a couple seconds, and two magic circles appeared, one on top of his sword and the other one was the ball on the blade itself. The latter generated vibration with the oscillation speed near the speed of sound. In a normal situation alone, this sword was far sharper than the one he had previously.

When the second magic circle was activated, it shook uncontrollably in his hand as he felt the wind blowing from the sword to his left and right.

Kai stabilized the sword in his hand by using a bit more power.

"I will try to swing it to see the response."

"Alright."

After getting the confirmation from Ria, he proceeded to swing it downward. The pressure moved from the sides to upward as he predicted. However, he never expected that it became a boost to the sword itself to create a more powerful swing, increasing the velocity.

"Not good!"

The force from the Sonic Boom pushed his sword farther than he aimed, hitting the ground. The Sound Wave immediately became unstable and uncontrollable as it flew in all directions, including Kai's body.

It hit him on the stomach as if there was a boulder hitting him right on that spot, blowing him away to the wall to the point it created a crater just from the force transmitted from Kai's body to the wall.

"Gah!" He spat out blood as he felt some ribs were broken.

"Are you okay?" Ria asked with a worried expression.

"I am fine. The pain is still endurable for one more time. The magic is incomplete, but I know that I should get used to the movement with the additional effect of the Sonic Boom first since I have settled down the problem with the loud sound produced by the Sonic Boom in the first week." Kai dropped to the ground, falling to his knees before activating his exoskeleton.

"Alright. I will gather a few data and show you my analysis…Probably giving you some models of how the sound wave travels when you use that magic by making a model of how the air flows around you."

"Thank you, that will help me a lot." He nodded before rising on his feet, ready for another shot."

While he had made good progress, his teammates had also taken a step forward in their training.

In EU Base, specifically in a garden of a certain mansion.

"Oi, Evan. Have you done watering the plants?" A middle-aged busty lady shouted while checking the leaves of the current plant in front of him. Her appearance was similar to that of Shirotsuka Sanae, even though she was older than her and a bit younger than her peers. It must be the work of the plants here.

"I have only done half of it. I need another fifteen minutes," Evan replied while keeping up with his work.

"Can you even do your job? Why are you so slow?" She shouted.

"I am doing my best just not to kill the plants." Evan sighed. He told her the truth. They both had the same magic, which was water magic.

"I would have done it ten times before you even finish."

"I am trying."

"Come on. You need to control the basic characteristic of the water and your healing abilities!"

Evan kept shouting back since this was how she trained him. To master the healing ability, Evan needed to improve his control over his water and its healing character, and one of the fastest ways to improve was to water the plants using that healing water.

If he overdid it, the plant would wither because of overdosage. If he lowered the dosage, he would be too slow like the current him.

Even so, Evan didn't complain about the whole training because he realized that his healing speed became faster by the day, so this training was worth the efforts.

Meanwhile, Sofia also had the same progress as him.

She had been training inside her mansion, specifically in her family hall.

This training hall had been used for many generations, including her father and grandfather.

Inside the hall were two people, one standing and one was on their knee. Sofia obviously the latter, panting.

"Huft." She took a deep breath and looked at an old man that had gone past his prime. Despite his aged expression and body, she had yet to land a hit on his body for the whole week.

"What? You want to stop?" He narrowed his eyes.

"I won't!" She gritted her teeth. "I have been training here for a week without any progress. Even though my movement has become more polished, I can't still touch you yet, so I will be working on this. Make sure you don't pull your punch."

"Hoho. In my retirement, my granddaughter suddenly asked me to train her, so I couldn't help but go here. I heard that you wanted to become stronger because of a man. You know how to rile me up, right?" He smirked evilly as if he wanted to do many evil things to both her and the man. "How is he compared to me in combat skill?"

"…" She thought for a moment and asked him first. "How do you compare to the strongest person in the US Base?"

"Are you talking about their S Rank magicians or that lunatic Ria Ross?"

"His teacher, of course. Don't tell me you haven't followed any news?"

"I have been fishing in the countryside, so I don't know. I only learned that you visited the US Base when I was on the way here."

"It's Ria Ross."

"Hoh?! Interesting." He smirked. "I myself am an S Rank, but that woman can become undefeated despite being an A Rank. Her skill and thinking are unique to the point we have trouble. If I compare myself to her, it will be six to four, she wins."

"Then, he can at least win two times against you. And he is training to be an equal of his teacher that is growing even more. If I don't have strength, he won't look at me. This is both for me and the base."

"Hoh?!" His smile became wider as cracked appeared below his feet before it turned into a crater. The pressure, killing intent, and battle instinct emanated from his body. It sent a shiver to her body as she realized why her grandfather could be considered one of the strongest magicians in this base. "I would love to see him."

"You will have the chance in a few months." She gritted her teeth and endured the pressure. "But now…You better not lose against your granddaughter first unless you want to be bullied by him."

"Since that is the case, I will start my offensive too from now on and hit you for real. Every time you lose, I will spank you one hundred times. Be prepared for it." He smirked.

"Are you going to kill me?"

"Nope. Those are slaps of love. If you do it every single day, humans can change and have a small evolution. You will have big butts after this, and I hear man love that, including me. Hyoho!" He laughed before disappearing from her vision as the battle had begun again.