The last time Thor saw Luo Kai, he was invited to join the mutual aid society.

If it weren't for Mentor Kaz's sudden appearance and calling Thor away, he would have found a way to politely refuse to accept Rokai.

Now that I'm hitting each other head-on, I don't know if the other party will ...... again

"Last time I asked you if you wanted to join the mutual aid association, I wonder how you thought about it?" Luo Kai smiled and stepped forward, blocking the exit of the library.

Unexpectedly straight to the point, I asked directly.

Thor subconsciously became nervous, but it quickly occurred to him that he was not a pure newcomer now.

"I'm sorry Senior Luo Kai, I'm too busy with work and don't have time to participate in any activities, please forgive me!"

The tone is respectful, but non-negotiable.

Luo Kai took another step forward, and the distance between the two was shortened to less than one meter.

"Is it really that busy? Or are you worried about this? ”

He reached out and flexed his index finger twice.

Like a little bug.

The other party actually took the initiative to confess the existence of parasites to him!

Thor frowned secretly, I'm afraid it won't be easy to deal with today.

However, to Saul's surprise, Rokai was not aggressive and continued to invite.

"Hee-hee-hee, I see. But you don't have to be so nervous. That little thing is just a means of ensuring that the internal information of the mutual aid society is not leaked. With such an excellent apprentice as Thor, we naturally believe in your character and will not use that kind of means. ”

"Thank you, senior, but I really don't have time lately." Thor saw that Luo Kai was loose, and tried to get out of the gap between Luo Kai and the door.

"Okay. But even if you don't want to join a mutual aid group, you can still join our exchange meeting if you have time. You work on the second floor of the East Floor, right? If you are really uneasy, you can also ask Hayden, the mutual aid association has always been very happy to work with him. ”

Exchange? Will Hayden go too?

Thor casually agreed, "If there's a chance." ”

"That's great, you can always find Tazawa and let him take you."

After Luo Kai finished speaking, he turned sideways to make way for Thor.

Thor glanced at the two of them, nodded, and quickened his pace to leave the library.

Rokai stood where he was, smiling as he watched Thor walk away.

After a while, he suddenly said to Tazawa behind him, "Since all your good friends died, you have become much quieter." ”

Tazawa was shocked, gritted his teeth and didn't speak.

Luo Kai didn't look back, raised his hand and accurately patted the top of Duoze's skull behind him.

"This is a good thing, if you want to grow up, you have to throw something away."

……

Over the next few days, Saul devoted all of his spare time to the books "A Crazy Man Teaches You How to Raise a Soul Servant" and "Conjectures about Soul Carriers".

Both books mention methods for preserving spirits, and both discuss spirit esters. It's just that the latter is more like a generalization, and the former is more specific.

Lingester is also a general term for a large category, which can be subdivided into many types.

The time for the soul to be preserved varies from a few days to decades. It can also be used in conjunction with other means to extend the shelf life of the soul again.

In addition to the basic function of preserving the soul, many spirit esters have some additional abilities. For example, the plastic bone in Thor's left hand has the effect of increasing the perception of dark elemental particles and increasing mana.

Good spirit esters are also quite precious materials in the wizarding world.

It's a pity that according to the classification in the book, the plastic bone of Thor's left hand should be the worst quality spiritual ester.

The soul can only be kept in it for a day or two.

After this time, it will basically dissipate.

There are very few natural esters in the world, and most of them are synthetic, which means that the synthesis scheme can be continuously improved.

However, if Thor can improve his plastic bones, he will not only increase the retention time of his soul, but also enhance his own magic and dark elemental perception again.

It's easier to optimize a witch body transformation plan than to try out a plan out of thin air again.

Saul immediately felt that he had found the right direction. His poor mana finally had the possibility of taking another leap forward.

It's just that this research is equivalent to reading a book that is out of the ordinary. Some of the words that occasionally pop up in it don't even have annotations. In order to study these words, Thor had to borrow another book or ask a tutor for advice.

This in-depth study gave him a lot of gains, and also deepened his understanding of the book "Soul Carrier" given to him by the tower master.

"The tower master should be a wizard majoring in dark attributes. All I studied was souls, corpses, and so on. The wizard tower also occupies the two-story space of the east tower as a morgue, and attaches great importance to it. I don't know what the tower master is studying now, it should be some higher wizard topic, right? ”

Two months later, Thor finally made a little progress in the optimization of the spirit ester.

He found that when making a dissolving solution to dissolve plastic bones, one of the materials could be replaced to reduce the impurities in the plastic bones that were not conducive to the preservation of the spirits.

It's just that what to replace, he still has to experiment.

The diary is a little unhelpful at this time.

It can remind Thor what materials not to put in Thor, but it cannot tell Thor what materials to put in a positive way.

Thor can only rely entirely on his own knowledge and experience.

Now, he finally got a taste of the normal wizard's research process.

Formulate conjectures step by step and verify them.

If the verification fails or cannot be verified, it can only be discarded first.

On this day, he went to the registration room to change a batch of materials and continued to verify.

"This is a cloud of electric storage...... Why should I change this thing? Is your brain watered? Thor slapped himself on the forehead.

"I know that plastic bones are afraid of electricity, so can I still power them up?"

In his own words, Thor suddenly had a new idea.

"In fact, plastic bones are afraid of electricity, and I should take precautions against this weakness in advance. Otherwise, if I fight with someone, it will be my death! Write it down, write it down! ”

Thor hurriedly wrote down his newfound inspiration in another book.

When researching, he often comes up with some novel ideas, but many of them have to be recorded first and saved for later because he does not have time to think deeply.

After writing the inspiration, Thor straightened up again and continued to examine the rest of the material.

"So, which one to try?" Thor pinched his chin and struggled.

At this moment, a black tentacle the thickness of a thumb rolled up a test-tube potion and held it up in front of Thor's eyes.

"This? Will this alkalinity affect the corrosion effect of the dissolved solution......"

"Holy!"

Thor suddenly realized that something was wrong and jumped straight out of his chair.

And the black tentacle didn't move away from him, but as if it was being pulled by something, it got closer to Thor's face.

Black slender tentacles, slippery skin, familiar way to roll things......

"You, you're the Soul Eater?"

Thor saw that the root of the black tentacle was in the blind spot behind him, and quickly turned to look back.

But the tentacle also rotated in sync with Thor.

Thor moved, and the black tentacles moved in the same amount.

Thor's expression stiffened, and he raised his hand and wiped it behind him along the black tentacles.

Finally, I felt the back of his neck...... The root of the tentacles.

Tentacles growing out of his neck!

Thor immediately ran to the door of the corpse, thinking about finding Mentor Kaz directly, or trying to turn right and go to the second-level senior next door.

The black tentacles were still rolling around the tube, moving steadily with Thor.

Before his finger touched the scarlet door of the corpse, Thor, who had just looked flustered, suddenly stopped again.

He looked over his left shoulder.

"Brother Diary, aren't you working?"

Diary quietly watching the play.

Thor thoughtfully, raised his hand to hold it at the junction between the tentacles and his neck.

The diary remains quiet.

Thor just started to exert himself,

"Chirp!"

The black tentacle was unexpectedly pulled out by him!

He touched his neck with his other hand, but no wound was felt and no second tentacle grew.

"So...... Maybe it wasn't parasitic, but I brought it out for a short time. But how does it remain active after it is detached from its body? ”

The black tentacle couldn't speak, and even if it was pulled off by Thor, it still rolled up the reagent and sent it to Thor's face.

Thor calmed down a little, and took the test-tube potion from the black tentacles.

"Well, before I study what you are, I'd like to see what the potion you recommend for this seaweed dumpling is for!"