The Witcher: Son of the Planes.

Colin's cleaning work lasted for three consecutive days. During this time, he met Teacher Lina once, but he just said hello and didn't say much.

Although Colin meditates every day, the growth of his mental power has been pitifully small since he was promoted to a senior apprentice. If it weren't for the real-time monitoring from Earth, he wouldn't be able to feel the growth.

His meditation method was purchased from outside. If it weren't for the fusion of two souls that gave him more mental power than others, he would have been left behind by others long ago.

After successfully becoming her apprentice, Lina never mentioned the meditation method again. Although Colin was a little anxious, he had no choice but to wait patiently.

In the evening, Colin returned to his residence and was about to have dinner with Helen when he received a message from Lina asking him to go there early the next day to clean the laboratory. She wanted to do an experiment and asked Colin to cooperate.

Nothing else happened in the evening, so Colin went to bed early.

The next day, not long after Colin finished cleaning the lab, Lina arrived at the lab.

Directing Colin to push over an experimental bed, when Colin was a little confused, Lina took out a humanoid creature from some space.

He casually placed it on the experimental bed. Although he didn't know what kind of human it was, Colin guessed that it might be the subject of this experiment, so he was very sensible and fixed the humanoid creature.

The humanoid creature had a bluish skin and a look of fear in its eyes, but no one knew if it was being controlled or injected with some kind of potion. It showed no resistance at all and allowed Colin to manipulate it.

After it was fixed, Colin saw Lina take out a sharp knife from somewhere.

To be honest, Colin didn't study medicine. He had killed many people in his previous career as a mercenary or in the army. But seeing Teacher Lina's appearance today, it seemed like she was performing some kind of surgery?

Colin felt that if it were him, he would not know how to start, and he always felt a little uncomfortable in his heart.

However, since I have chosen the path of a wizard, learning the experimental methods and forms of the strong is a process that I must go through, and I can only adapt to it slowly.

Fortunately, Colin did not show any discomfort, and Lina did not have the energy to take care of Colin. She just told Colin to press it.

Lina put on a pair of almost colorless gloves, picked up a knife and stabbed the blue-skinned demi-human. The demi-human looked terrified, as if his eyeballs were about to pop out, and his body was shaking violently, but his struggles were in vain.

Not to mention that he was already fixed on the experimental bed and Colin was still pressing him, not to mention that his body might still be controlled.

The cut made by Lina was very small, but it quickly moved down the chest, and Colin saw the subhuman's internal organs through the cut.

The demi-human's chest rose and fell violently, and his breathing became much more rapid.

Soon, Lina began to squeeze the demihuman's heart with her hands. Colin looked at Lina, not knowing what she was going to do. This was not fun...

The demi-human's body began to shake more violently, and the color of his skin began to turn dark blue. Colin seemed unable to control him.

Lina observed the demi-human's performance and appropriately slowed down the frequency of squeezing, but soon she was squeezing his heart at a faster speed.

The demi-human suddenly broke free from the fixing buckle and Colin's control. After a roar of "Ah", he ran out of the laboratory.

But as soon as he took a step, he was controlled by a huge wizard's hand.

He struggled, trying to fight the control of the wizard's hand.

Finally, with a "bang", it exploded into pieces.

The whole room was filled with fragments of subhuman skin and internal organs.

There was still a piece of it hanging on Colin's head, but fortunately Lina had an invisible shield on her body, so nothing fell.

"Let's clean up." After saying that, Lina was the first to walk out of the laboratory.

Colin was speechless. He didn't understand today's experiment at all, and he didn't know what experiment Teacher Lina was doing. Well, let's clean up first.

Colin felt like he had wasted his morning cleaning. In less than an hour, he was faced with the task of cleaning up again, and it was even more difficult.

Half a morning passed quickly, and Colin rushed to the library in an effort to understand the situation of the subhumans.

After roughly describing the characteristics of the sub-human, the administrator told Colin that this was a blue-blooded sub-human race produced by the Bluesway plane. They were now also considered slaves of the Wizarding Continent and could not be treated like normal people. The specific situation could be checked in the latest information.

Following the administrator's instructions, Colin quickly found the information about the blue-blooded people and borrowed it after paying 5 merit points.

It turns out that the Blueswei plane where these blue-blooded people live is a low-level plane that the Wizard Continent conquered 100 years ago.

The main creatures in that plane are the blue-blooded people. When they conquered that plane, they put up a very fierce resistance and the wizarding world lost a lot of slaves, including a formal knight who died.

Although this plane was not conquered by the forces of Griman College, after more than 100 years of slavery development, it is easy to purchase these slaves.

Teacher Lina is probably also curious about the reason why blue-blooded people have such special fighting spirit.

Thinking of this, Colin felt a little regretful. He had no experience at that time. He could have sorted out some blue-blooded people's blood while cleaning. It was a big loss. He had to wait for the next opportunity.

When he returned to his residence at night, he talked about this with Helen. Helen laughed at his inexperience. She said that the things that formal wizards study must be valuable. Teacher Lina asked you to clean up because she wanted to provide you with convenience.

When you come across useful and valuable materials, it is equivalent to a benefit given by the teacher, but you just throw it away.

After hearing what Helen said, Colin felt that he had missed a lot, especially in the process of studying in the Victoria's Secret world. Not entering the academy to study was a great loss, resulting in him not knowing that he had encountered a treasure trove.

It seems that these days, if I have nothing to do, I can go to the library more often to enrich my basic common sense.

In the following days, in addition to cleaning Lina's laboratory on time, Colin spent all his time in the library. Some basic common sense was not expensive anyway, and Colin didn't care whether it was useful or not, or whether it was unpopular or not. As long as it was cheap, he would spend merit points to learn it.

During this time, I met Connie again. After not seeing her for a few days, Connie seemed to have forgotten the unpleasantness with Colin last time. She talked and laughed with Colin for a while.

Afterwards, each of them went to look for the necessary materials to study.

After a while, Lina found another blue-blooded man. This time Colin's performance was much better than the first time. Teacher Lina's experiment may have made some progress. This time she did not kill the blue-blooded man, and even sutured his wounds later.

Colin also took advantage of the opportunity to follow Lina's experiment and obtained three small tubes of blue-blooded people's blood, preparing to study it when he has time.