"We'll start with the aura, which const.i.tutes the main topic out of all three, and of course, the most important. The aura represents an individual's overall strength. It's created based on many things: your mental fort.i.tude, your life force, your age, your physical strength, and even your soul" Arima explained.

"It's really what you can call the manifestation of power. The aura can take numerous forms, it can simply be spiritual or have a physical property. Some talented people use their auras to fight, but that's everything, you can do a lot of things with your aura. It's basically an extension of yourself when you use it, you don't lose anything, no mana nor mental energy"

Arima said and then raised his hand. A blue, faint light appeared above his palm. Arima moved his finger and pointed it around the cla.s.s and the blue aura followed. He then clenched his hand and the aura became a fast projectile that made a hole on the floor.

"That's why it's easier to restrain people weaker than you with your aura" He resumed as he repaired the ground "Simply because that way, you won't have to spend your energy for nothing. It's even better than neutral magic on this aspect. The aura is also something you use to control your magic and cast it, a bit as you do with mana"

"Of course, the aura is something you all know perfectly about since you were born. But people still can't use it in an efficient way. I want you to keep in mind that your aura is an a.s.set you can use. When you stumble on a certain situation where it could prove itself useful, don't forget to use it. It will become an automatism if you keep doing that" Arima declared.

"The next one is the mana pool" Arima followed "As you all know, the mana pool does not represent your mana storage only, but the term also refers to your mana quality and density"

"The mana pool resides in the soul and its size often depends on the soul's, as I said before. The size is one thing but the quant.i.ty of mana is another. The size of the mana pool is decided at birth, but the quant.i.ty can only go up with training"

"You can have a recipient but you can't make use of it if you don't pour something in it. That's the same thing with the mana pool and mana itself. There also cases where people can't even fill up completely their mana pool in their entire lives"

"Another thing I need to talk about is magic circuits. Magic circuits are what allow us to gather mana in your soul and use it. It's also through those circuits that people can cast magic" Arima said and smiled "If I told you I was born in a place where there were no magic circuits, would you believe me?" He said and his students looked at him in confusion, they had never heard about a place where there weren't any magic circuits.

But they all believed in their teacher and nodded. Arima chuckled "And that's true, the place I was born in didn't have any circuits. In that place, since magic circuits were inexistent, I couldn't gather any mana and couldn't use magic" He said.

His students were still a bit lost. They didn't understand why he would bring that up so suddenly. Arima smirked at their reaction "That's why I can do this" He said and snapped his fingers.

The students felt a strange wave going through them and then felt dizzy for a moment. Night and Karma weren't an exception, but they knew what it was. Only Lanya was unaware. Arima rubbed his temple a bit and got rid of the dizziness in a few seconds. He then smiled at his students.

"I just cut every magic circuit in this cla.s.sroom" He declared and the students widened their eyes. They tried to gather mana but couldn't. No matter how many times they tried. They could only feel the mana they had stored in their mana pool.

"When you're cut off from the magic circuits, you're unable to retrieve your mana spent. If you ever ran out of mana in that state, you'll become a simple human unable to use magic" Arima explained and everyone looked at him in shock and anxiousness because of the lack of circuits.

"Don't worry, even I can't cut definitely your connection with circuits like that. I can only do it temporarily. If I don't do it again, it will come back naturally with time. I didn't use a strong wave right now. I should come back at the end of the period" He said to calm them.

"Of course, this technique has huge downsides, which are the fact that I can't restore the connection willingly and that it affects a zone around me, and I can't escape it. And since the mana inside the mana pool remains, unless your opponent is weakened, this is useless. But it's interesting to mention that you can use your aura in that state" Arima declared with a smile.

The students didn't know if they should be proud that their teacher created this technique or embarra.s.sed that the downsides were so obvious.

"Well, I'll teach you how this magic works later. I'll just pa.s.s to the density and quality of mana. To raise quality, which means the efficiency between mana used and the result of the magic cast, the key is simple mediation. You need to clear your mind as much as possible and get rid of every bad thoughts" Arima quickly explained.

"Now, the density of mana is a special thing. Density means the quant.i.ty of mana you can compress together to take the less s.p.a.ce possible in your mana pool. Usually, people who don't have a big mana pool choose to increase their density to be able to store more mana in their pool"

"Well, that's all for this spiritual force" Arima said "The next one is, of course, killing intent. You all know what it is. The manifestation of murdering impulses. Of course, I won't show you mine, I don't want to wake up and scare the entire continent" Arima said casually and his students felt very awkward that he said that so pa.s.sively.

"To be honest, you can't do a lot of things with killing intent. The only use you can make of it is basically scaring your opponents or surprise them in a fight. But unless your killing intent is strong enough, it's basically useless. And the only way to raise your killing intent is by killing, well not only humans but if you just go around killing beast and monsters, your killing intent will never be strong enough to perturb a human" Arima said and everyone nodded.

"Killing intent can also be used as a catalyst for magic theory. Actually, the deadliest magic necessarily has killing intent infused into them" Arima breathed out after he finished.

"Obviously, what I just said is written in the books I gave you, you can look into it for more details later. Now, the main point of this cla.s.s" Arima declared "About two weeks ago, I coincidentally found a new magic, or to be exact, a totally new concept of magic theory"

"Tell me, what do you think about when I say luck? Or fate?" Arima suddenly inquired and his audience was stunned for a moment.

In the end, the usual student model, Ofia, raised her hand awkwardly "Is it our destiny? Our future actions and how we will live and develop. But what teacher just mentioned is a destiny to which we cannot do anything to change it" She said.

Arima smiled and nodded "Correct. You perfectly explained it. Fate and luck are things connected to our future. But both of them are concepts we cannot alter in any circ.u.mstance. Fate is something that was decided for you. And for luck, there are some smart people trying to say that it's only an idea of cause and consequences, but luck is definitely something you can't plan or create"

"If for example one day, you suddenly bend down for some reason and then avoid a critical attack. You won't say that you survived because you were so skilled that you planned the attack without knowing anything, right?"

Arima smiled wryly and his students could only agree when it was put that way "The reason why I'm telling you this is for the presentation of the magic I want to teach you about" Arima declared "That magic, I named it 'Libra'. Not 'Libra magic', but the 'Law of Libra'"

When he said the name, everyone started thinking about it almost instantly, trying to find any kind of relation between luck and Libra, the G.o.ddess of Fairness and holder of the 'Balance'.

Arima smiled at them "Have you heard about the luck theory?" He asked "Simply said, luck is a something you acc.u.mulate during your life, when you feel positive, make good deeds and so on. Then, when you are lucky about something, the amount of luck you acc.u.mulated regress. And if you force your luck, you risk to fall into a negative amount and acc.u.mulate bad luck" Arima explained.

"My magic is directly related to that concept" Arima said and took out a s.h.i.+ning gold coin from his storage "If I flip this coin, I have 50% to either get heads or tails" He said "But, in the end, your luck will determine the result"

Arima added and started chanting "[Qui vocat Lex Libra] (I summon the Law of Libra)"

"[Pondus verba mea et iudicia mea imperium] (Weight my words and execute my command)"

"[Judicium, quod Libra] (Execute, The Balance)" He finished his incantation and the coin glowed for a second.

He looked at his students "Look at this carefully" He said then put the coin on his thumb, preparing to flip it "If it lands on heads, the coin will duplicate. If it's tails, I'll be hurt" Arima said and tossed the coin while closing his eyes, making it spin in the air for a moment.

The students couldn't even consider what Arima had said when he flipped the coin before it fell back. Arima caught it with his right hand and put it on his left, covering it.

He opened his eyes and slowly uncovered the coin. It was tails. Instantly after that, the coin glowed and blood suddenly painted it. The students exclaimed in shock and worry. Arima's palm was deeply cut and blood kept flowing.

Arima shrugged and waved his right hand to calm his cla.s.s. The cut healed in ten seconds after that. Which was actually really strange. For Arima, healing this kind of injury shouldn't even take three seconds.

"As you saw it, I was unlucky and got tails" Arima said after he finished to heal his hand. At that point, most of the students understood the principle already. It was basically a magic made to gamble with your own luck and fate.

"I think most of you understood it. I made a gamble. If I had won, I would have got another coin. But I lost, and I paid the price for my greed" Arima explained and smiled.

"Now, you may be asking yourself with who I gambled. Right now, I gambled against the world of magic itself. I imposed the gamble on the world, in my theory, it's by the intermediary of Libra" Arima said and his students were enlightened "Of course, this a new magic theory. Totally 'fresh' and certainly not optimized. You're not obligated to use the same theory as me, and you can replace Libra with something else"

"One more thing" Arima continued "Since now I used my bad buck, I should have gotten more luck. That's what I call the 'Balance', which is translated into 'Libra' with the runic language I use. It's also the second use of my magic, controlling luck with bad luck, and conversely"

"When you're unlucky, you basically have more chances to be lucky the next time" Arima flipped the coin one more time, without setting any magic. When Arima looked at the result, it had landed on heads.

"And finally, the biggest strength of this magic. The important aspect, which even scares me if it's well used" Arima's voice became more serious and resonated in the whole cla.s.s.