In the first class of admission to the Royal Academy of Magic, Dean Manan taught Xia Lin and his students that mages were never allowed to drink alcohol.

Because the drunken state destroys the mage's ability to build a spell model, they lose their ability to cast spells, and mages who lose their ability to cast spells are lambs to the slaughter on the battlefield.

However, it is rare to be so happy today, and there is no danger in the imperial capital, Xia Lin still made an exception to drink a glass of fruit wine with his father Old John, which should be the adult wine that his son and father drank after adulthood.

He didn't feel anything, but Old John kept telling about the past suffering of the Carl family, about the three children who died before the three Xia Lin siblings, and about a younger brother who died later.

kept sighing about how many children he could feed if he was a factory director, and went downstairs to rest early drunk.

After the lively and somewhat heavy birthday party, Xia Lin asked his mother and Hurley to pack three cakes to take to the laboratory for the researchers to have a touch of his birthday.

Because Wyatt was placed in the industrial park by Xia Lin, there was no one in charge of hygiene and food in Carl's laboratory.

Later, after the establishment of the White Sugar and Refined Salt Factory, Long and Zu, two Seine slaves, lost their jobs, and Xia Lin arranged for Long and Zu to take charge of these chores in the laboratory.

The two were also sent to study with the groom for a while, and after learning to drive the carriage, they were responsible for transporting sugar and molasses to the industrial park to Carl's cake shop every day, and taking John and Hurley to work and school by the way.

However, for safety reasons, Xia Lin did not let them go through the slums to the industrial park, but went to the dock in the North District to take the cargo ship ordered by the industrial park directly down the river to the industrial park.

Riding to Carl's lab in a carriage, Charin quickly learned what Harper meant by the birthday present.

"Conjecture and Proof of the Theory of Rune Center and Spell Model Function Center...... Harper, and you guys, you guys have a big surprise for me!"

Xia Lin sat behind his desk and looked at the results of the laboratory during this time, and said in surprise to Harper and the temporary researchers who were sharing the cake.

"This theory was originally proposed by Luna, and we just played a role in verifying and perfecting it, Xia Lin, what do you think of this theory? Can it be of any use?"

Harper asked, pausing to split the cake with a wooden knife.

"Let me take a closer look, but judging by the title alone, I think it will be a very interesting and useful theory."

Xia Lin turned the title page and began to read the research results.

According to Harper's research notes, "Conjecture and Proof of the Theory of the Center of Action of Rune Centers and Spell Models" originated from a question that Luna had on a whim when she was familiar with the spell model of the One Ring Spell Magic Missile.

That is, many types of runes can work on their own, and the spell models composed of these runes can also take effect, so what is the process of their spell effect?

Luna experimented with spells and discovered that the runes work as simple as generating spell effects on the runes.

The way the spell model works is a bit more complicated, as it usually generates a spell effect on a relatively central rune.

This phenomenon may seem unremarkable, but the mages are used to it.

However, Luna, who had been studying with Xia Lin for quite some time, noticed a problem, that is, why did this spell effect take effect in such a position as a rune or spell model?

Thinking of the origin point in the coordinate system given to them by Professor Charlin, Luna came up with a conjecture that the runes and spell models had a certain center point, and the magical effects they produced would be manifested at this center point.

In order to confirm this hypothesis, it happened that Karl Labs' research on the Ring's cleansing spell model had recently stalled, and Luna wrote a report on the hypothesis and submitted it to Harper, much to Harper's intrigument.

So Harper assigned ten people to form five groups

to assist Luna in proving this conjecture.

By the time of Xia Lin's birthday, they had experimented with fifteen types of first-class runes that they had mastered in the laboratory, as well as rune groups and spell models that could be used individually.

It was thoroughly proved that the runes and spell models had a center of action that generated spell effects, and they also determined the specific coordinate range of the centers of action of these runes and the four spell models.

It's just that they don't understand the usefulness of these research results.

"The center of the spell effect? Speaking of which, I've always been used to the feeling of casting spells, and I really didn't notice this problem.

It seems that Luna has grasped what I call a researcher's mind, which is not to let go of every seemingly ordinary and normal phenomenon, and to learn to find the essence of seemingly ordinary things beneath the surface."

After reading this experiment report, Xia Lin faintly got some inspiration, he looked thoughtfully at the girl who was eating the cake, and said with appreciation.

"This is all taught to us by Mr. Charin, to pay attention to every detail, but this theory doesn't seem to be useful."

Hearing Xia Lin's praise, the girl with short blue hair smiled a little shyly, and then said distressedly with a wooden fork sticking the cake on the plate.

"No, how can you say it's useless? I think this theory has a lot of promise!"

Xia Lin shook his head and got up and said:

"Do you think that the center of the spell model seems to have something to do with the location of the runes in the spell model?"

"Where are the runes connected? Do you ...... say?"

Harper's mind moved, and he looked at Xia Lin in surprise and amazement.

"That's right, that's it! I suspect that the center of action of the spell model has something to do with the way the runes are connected in the spell model!

Otherwise, these runes have their own rune centers on their own, but why do the centers of action change to another range after they are connected?

Luna, Harper, maybe you've found a key to the right path, and all we're going to do now is use that key to open the door that stands in our way!"

Xia Lin affirmed Harper's idea, explained the basis of his conjecture, and said to them in a solemn tone.

"I... I see!"

Luna nodded in surprise as she didn't expect that the theories derived from her own accidental conjectures could be of any help to Carl's lab's research project.

"I finally came up with an idea, and we'll start working on it as soon as you're done eating the cake.

As usual, we worked in pairs to start researching the various spell models we had in our lab, finding their center of effect, and then comparing how they were connected to see what was going on!

Luna and I are in charge of determining the center of action of the Flame Arrow spell model, and Harper and Lamb are in charge of ......."

Xia Lin nodded, quickly entered the research state, and began to assign tasks.