It's not that hard to open a hospital in another world, right?

Chapter 180 Upgrade, which magic is engraved?
Gretel rushed into the room.

He buried his head and ran wildly, running as if there were monsters chasing after him.The female knight called him from behind, but Gretel pretended not to hear;
Master Tolga shouted, "Okay?" Gretel nodded indiscriminately, and kept walking;

Elder Wood raised his voice and laughed, "Grete, you haven't returned the stick yet..."

"Bernard, watch the door for me! Don't let anyone in!" Gretel rushed into a guest room - the one he had taken up on his last visit - and slammed the door.The two old men glanced at each other, and they were about to laugh at him, but their expressions changed:
"This is……"

Elder Wood suddenly stood up.He ran to Iris's room, took back the oak staff with the momentum of a snatch, and turned around to rush back.Not far from the door of the guest room, Master Tolga stood blankly with a dazed expression:

"Is this fluctuation... so strong?"

He instinctively wanted to go in and take a look, but as soon as he took a step, the barbarian raised his bone club warily.Elder Wood was angry and funny, he pulled the old magician back two steps, and beat the staff.On the muddy floor at the door of the room, a strand of green grass broke through the dirt and swayed out. Just as it took a head, it bent down towards the interior of the guest room.

"...What a strong elemental vortex."

Elder Wood looked solemn.

In his perception, what exists in the room is no longer a human being, but a whistling and spinning small tornado, constantly sucking the surrounding power into it.He gently stretched out his left hand, spread his five fingers, and stared at the cold hair standing upright on the back of his hand.The invisible elemental wind is flowing through the fingers and blowing into the guest room...

If it is a fourth-level, fifth-level, or stronger spellcaster, such movements are nothing.The problem is, Gretel is only a second-level priest, a first-level magician, and the leaf on the oak staff is still green and tender-how did he manage to upgrade so strongly?Can he control it?

Gretel didn't even think about whether he could control it.He fell down on the bed, assumed a not-so-standard meditation posture, and quickly closed his eyes——in the meditation field of vision, various elements, such as earth, water, fire, and wind, brightened up one by one.

In the void, the translucent light man stood silently.Power is pouring in silently from all directions, filling the bones and muscles of the "self".

The power this time was different from the gentleness and peace when the priest level rose, it was more turbulent and irritable, and Gretel had to concentrate on guiding them in and arranging them one by one.Around the light man, the "shell" that carries and filters the elements is also stronger, and the power of the elements between the shell and the core is silently rippling, waiting for his further arrangements.

Gretel knew that his work was not over yet.The upgrade of a formal magician is different from that of a wizard apprentice.Gretel has long heard in the training class that every time a formal magician upgrades to a level, he can and must engrave a spell in the meditation environment——

The step of engraving is to use mental power to build a strong enough spell model between the "shell" and "core".

This magic can be learned or self-created.Of course, if it is the magic created by the mage, it will be more powerful after upgrading.Moreover, you can basically ignore the casting materials, skip the chanting, and make it happen instantly.

The engraved magic cannot exceed the level of the magician before upgrading. Of course, it doesn't matter if it is lower than one level, but it is a bit wasteful.Generally speaking, magicians will choose the most advanced spells they have mastered...

So which one to choose?

Gretel was in a dilemma.

Magic tricks, mage's hand, X-ray magic, B-ultrasound magic...

Bubble Spell, Mage Armor, Burning Hand, Changing Wind...

The magic that I have learned is spinning in my mind one by one.Commonly used, uncommonly used, high-level, low-level, self-created, non-self-created...

One by one, the spell models rose up, arousing the feedback of external elements, and then scattered by Gretel with his thoughts.After several attempts, Gretel discovered that the elemental fluctuations attracted by higher-level magic are stronger than those of lower-level ones; the fluctuations attracted by self-created magic are stronger than those created by others.Of course, Gretel still doesn't know what the attracted elements can do, he only knows one thing:
Once inside this "shell", it is my thing, so don't leave!
In comparison, among the several spells, the one with the strongest ability to induce elements is the burning hand.Imagine being able to burn people with white fire without carrying a test tube of oxygen or searching for potassium permanganate everywhere, Gretel was a little excited.However, just as he was about to use his mental power to construct this magic, he hesitated a little:
Is this the most important thing to me?

Is what I want really lethal?
He turned his attention to B-ultrasonic magic.As far as the mind can see, this magical spell model quickly lights up in the meditation environment.Vibration, frequency, direction, feedback, interpretation...

Circular, triangular, wavy curves, various shapes and lines are combined to build a three-dimensional three-dimensional structure.It's okay when you just cast a spell, but now you start to construct it with mental power, and it immediately makes people flustered.This is much more difficult than drawing a [-]D stereogram on a computer, without tools!

For example, in the structure of B-ultrasound magic, there is a section of Gretel that looks familiar, like a sine curve.The problem is no ruler, no compasses, empty hands - or empty minds to draw curves in a meditative environment?

Isn't this fatal!

Gretel held his breath, and began to mobilize his mental power to outline the spell model stroke by stroke.Straight line, curved line, three-dimensional... Draw it out, fill it with spiritual power and stabilize it, and connect several parts with each other...

Regarding the way of drawing spell models, especially difficult curves, the mage tower only said "drawing according to the scroll".Because of this, when different magicians learn the same magic, the effect can be very different. Some are like Monkey King playing it, and some are like monkeys playing monkeys on the street...

But entering the training class this time, regarding the spell model, the teacher who gave the lecture gave a new way:
Use math!

What is a triangle, what is a circle, what is a curve - it's all math!
What?Are you bad at math?

Mathematics is the foundation of arcane art, if you can't learn mathematics well, don't be an arcanist!
So the line of this sinusoid... By the way, I remember the formula is y=Asin(ωx+φ)+k, let me substitute it in... by the way, A is the amplitude, ω is the angular frequency, let me put Adjust these two values ​​​​and see what happens...

Then, meditating on the "self" in his vision, his eyes widened in astonishment.

Earth, water, fire, and wind, other than the four elements, appeared for the first time.It’s hard to say what it is, but waves rise and fall, vibrate, pass to nowhere, and reflect back from nowhere...

This is wave!
It's wave!

No matter if it is a longitudinal wave or a transverse wave, electromagnetic wave or mechanical wave, in his meditation field of vision, for the first time, such a thing as "wave" appeared!
Feedback from the meditation world has been overwhelming.

B-ultrasound magic, a variant of echo magic, was a gadget that only got two research points in the Magic Council. In Gretel's meditation environment, it was solid, solid, and shimmering.

After filling the spell model, the elements pouring into the meditation environment continued to spread out, increasing the concentration of elements inside the "shell" by at least [-]% in one breath.

Gretel opened his eyes with satisfaction.

"Yay! I don't have to carry a bunch of bats anymore!"

　Thanks to @爱赛拉市车的奥妮 for the reward of 500 starting coins

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(End of this chapter)