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Chapter 13
The magic that Yujin learned from Ivrin at the Kalibor Magic Tower was her original spell, “Coil Lightning.”
Yujin gave it that name, and just like the name, it was a high-level lightning spell that tightly twisted lightning into a coil shape.
When electric current flows in a coil, it creates a magnetic field because of Ampere’s law.
Using this principle, in his past life, there was a weapon called a coilgun, which fired magnetic projectiles.
But those coilguns had many practical problems, so they were not very powerful in reality.
‘…Why is it so strong?’
Yujin was shocked after seeing the steel ball destroy a tree.
In his past life, most coilguns were only as strong as airsoft guns.
But now, the coilgun made with Coil Lightning was strong enough to knock down a thick tree.
“…If I shoot this at a person, they would really die.”
And he didn’t even use a proper bullet—just a simple steel ball.
Still, it had deadly power.
While thinking about the reason, Yujin realized something.
‘Ah… I see.’
“There’s no need to worry about heat.”
Normally, the power of a coilgun depends on how strong the electric current is.
But stronger current creates heat.
Too much heat melts the wire, which limits the power.
That’s why real coilguns can’t become too strong.
Cooling is a major problem.
But Coil Lightning was different.
It created lightning directly in the air, not through wires.
So there was no risk of wires melting.
“That means I can use far more current than a normal coilgun.”
That’s why this version was much stronger.
‘…I didn’t expect this kind of use.’
There was another advantage.
Depending on the projectile, it could be used in many ways.
He could make sharp bullets for better penetration, or use stronger magnetic materials to increase power.
Of course, it required very precise control.
But with practice, that could be improved.
“As long as it’s magnetic, I can use anything as a bullet.”
The possibilities were endless.
But there was one problem.
“…I’m so tired I feel like dying!”
The mana consumption was huge.
He had used all his mana to test maximum power.
That wasn’t practical.
“I need to optimize this… It doesn’t need to be this strong for self-defense.”
* * *
After that, Yujin tested different settings for his magic coilgun.
It required skill and control, so he practiced to improve speed and accuracy.
Maximum power could easily kill a person, but that wasn’t always needed.
In some situations, firing weaker shots quickly would be better.
Like a baseball player practicing new pitches, he kept adjusting his control until it became natural.
Then he realized something new.
“This… is very useful when I don’t have a weapon.”
There were places where weapons and magic were forbidden.
Weapons were taken at the entrance.
Magic was blocked by special artifacts.
Places like banquets, palaces, and temples had such rules.
In those places, magic could only exist inside the caster’s hand.
Outside, it would disappear.
So attacking was almost impossible.
But—
“This creates physical force inside my hand and fires a projectile.”
That meant this attack might bypass those restrictions.
Even if the range was limited—
“I can solve that with better materials.”
For example, using alloys like nickel and iron could increase efficiency.
He would need to get nickel in the future.
‘Well… it’s better to be prepared.’
Life was unpredictable.
It was always good to have more ways to protect himself.
* * *
After practicing enough, Yujin went out to the city for the first time in a while.
He had been stuck in his workshop and the magic tower for too long.
He wanted a change of atmosphere.
“Damn it… why is my life still the same even after reincarnation?”
His past life had been miserable too.
Working, studying, barely sleeping.
Even now, he was still working all the time.
So he decided to enjoy life a little.
But—
“Wow… I have no idea what to do.”
He had never really had fun before.
So he didn’t know how.
While walking around, he noticed something.
[Harrod Tea House]
People in this world drank tea instead of coffee.
So tea houses were popular places to relax.
Even though he was alone, he went inside.
“Welcome, sir.”
Yujin ordered a tea similar to Earl Grey.
It had a familiar but slightly different taste.
While thinking about random things—
Someone spoke.
“Ah, no wonder the air feels dirty today. A half-commoner is here.”
Yujin turned and saw a silver-haired woman.
It was one of his half-sisters, Laisha Magnus.
Yujin frowned and ignored her.
He just wanted peace.
Laisha sat in front of him and kept talking.
But Yujin used his special skill:
“Selective hearing.”
A skill he learned in graduate school—ignoring useless noise.
While glancing at her, he noticed something on her wrist.
A bracelet with a bitten apple design.
‘…An apple watch?’
Laisha smirked.
“This is a limited ‘Apple Bracelet’ from the Cartier family. Someone like you could never have it.”
Yujin was shocked.
“They actually made and sold that…?”
Just then—
“What are you doing here, Laisha?”
A man approached.
It was Cassian Magnus.
“Brother! I was educating this half-commoner.”
Cassian looked at Yujin with a sneer.
“You’ve gotten arrogant lately, Yujin.”
Yujin ignored him.
But then—
“Soon, your workshop’s fate will be decided in a competitive bid.”
Yujin stopped.
“…What did you just say?”
Cassian smiled.
“We’re betting 25% of our workshop. Your entire workshop equals that.”
It was a competitive bidding system inside the Magnus family.
Workshops competed to complete a request.
They could even choose their opponent.
This time, the request was:
“Create a metal that does not rust.”
Cassian chose Yujin on purpose—to destroy him.
“We have many enchantment tools. We can easily make such a metal.”
“But your workshop? You’re finished.”
He laughed loudly.
Yujin stayed silent.
Not because he was afraid.
But because—
“…They can just make stainless steel. What are these idiots talking about?”
He couldn’t understand why they were trying to solve such a simple problem in a complicated way.
