His eyes widened, he flapped his wings and swung Karma along with multiple fireb.a.l.l.s. Night flew up and looked back at Lanya before smiling.

"I see, so you were using gammas since the beginning, huh?" He said "That's impressive, I didn't realize it at all. But it's an easy thing to heal, next time you should take your time to predict the moment where I will be the most perturbed by it" Night's body glowed with blue light while he was talking.

"Well" Night smiled and landed on the ground "That should be enough for today, I taught you all of the fifth arts. Arima and Arister also finished" He said and looked at the sky, Arima soon appeared there along with Arister.

"Hey, hurry up, I didn't use time magic to create this one and I want to sleep" The former said and left the dimension "You have three minutes before I severe the link to this place" He left as the last message.

Night returned to his pup form and jumped on Lanya's shoulder who had released her dragon form "Let's go" Night said and the three remaining people in the dimension left.

********************************************

"So, we're left with wind and earth" The next day, Arima resumed his lectures.

"Let's go with wind first, it's the most complex before earth. Wind is the flow of gases on the surface of the planet and its movement is produced by variations of the atmospheric pressure. That pressure is basically the weight of the air around the planet. Since it's never even, there's always winds and sometimes hurricanes"

"Let me give you an image" Arima waved his hand and his projection depicted a parcel of water "Imagine a calm water, with even depth. If you let fall an object in the middle of that water" He said and, on the projection, a white square fell on the water "When it falls, it'll create a pressure on the surface of the water and produce waves that will flow outward. It's the same thing with wind, just that the object is atmospheric pressure"

"The water is the air itself, and the waves are the wind. Then, now, let's talk about tornados, how are they formed? Usually, it's after a thunderstorm that creates a c.u.mulonimbus cloud and disturbs the flow of wind, it will create a horizontal swirl that will suck up warm air from the ground, creating another disturbance and making the swirl to be vertical, thus, creating a tornado. Well, this is an explanation really summarized while skipping some details" Arima explained.

"There's also a lot of different conditions that are to consider in particular cases. But remember this at least, an instability in the flow of wind can be created by the clash between cold and warm air"

"The last thing I want to talk about is the composition of air like I said, the air is composed of different gases. First, there should be nitrogen, which is in the largest quant.i.ty, after that we have oxygen, necessary for humans to live, after that, there are argon and lot of other gazes in really low quant.i.ty and density. But an important thing to know is that the air has always around 0.4% of water vapor, 1% above the sea level. As a wind mage, if you can separate those gases you can create poisonous air, by either getting rid of oxygen or nitrogen, because even if the former allows us to breathe, if we take it in alone, it becomes poisonous"

"You can also isolate water and create some from nothing, you can also turn your wind cold or warm, depending on how you control the molecules" Arima added.

"Now, let's continue with the application. Of course, wind can be used as blades and s.h.i.+elds, it shares some similarities with water on that aspect. It can also create like I said, destructive winds like tornadoes. You can control the composition of air, the ambient temperature, the wind strength, to impede your opponent"

"As for the magic theory" Arima mused "Well, to be honest with you, it has not much use compared to the other elements" He said and looked at Lena "But it isn't like there's nothing you can do with it, I may be unable to find good ones, but if wind is your specialty, you can give it some thought. There's a lot of things to use for that, legends and mythology are just one part of them" He smiled.

"Well, the last one is earth, right?" Arima asked an obvious question and his students nodded "Well, I already checked, so let me tell you this. This planet is separated into four main separate layers. The crust, the mantle, the outer core, and the inner core. For the core areas, I'll let you imagine what is inside. I'll just talk about the mantle and the crust. The combination of the crust and the upper mantle, representing the surface of our planet, is called lithosphere. What I want to talk about are the tectonic plates, that are pieces of the lithosphere"

"In theory, tectonic plates float and travel independently over the mantle, and it's at their boundaries that seismic activity comes from. If I'm not wrong, and it's just an a.s.sumption, but there should be around forty plates on this planet. Of course, there's a reason why I'm telling you this, earth magic users' need to at least understand the ground on which they are standing"

"Which lead us to the composition of what we call earth, or the soil. It consists of around 45% minerals, 5% organic matter, around 25% water, and 25% of air. These are the main components of soil, which are also needed for life to grow on it. Like trees, flowers, fruits, and gra.s.s. But still, remember that soil only represents the surface of the planet. The majority of the planet is just rock and is, of course, the main strength of earth mages. On our planet, there's a lot of minerals that compose what we call the mantle. There're incalculable quant.i.ties of things like iron, aluminum, silicon, pota.s.sium, magnesium and even oxygen"

Arima breathed out "Let's go, last explanation for the eight elements. For a first-degree application. Earthquakes, creva.s.ses, landslides, rock and metal control. Attacks with a lot of impacts you could say. It's also one of the best when it comes to defense. Particularly with an elemental body"

"As for the magic theory, there's one very important, and that is gravity"

"Eh?" After Arima's declaration, his students exclaimed.

"I know that mages think that the only way to increase gravity, somehow, is to use wind to increase atmospheric pressure or neutral magic to directly push the opponent to the ground. Some also try to use s.p.a.ce magic. But gravity comes from this" Arima pointed toward the ground and said.

The students followed his finger and looked bewildered at the ground "Of course, it's not the ground that is generating gravity, it's the planet itself. Then, as a matter of fact, earth magic has a direct connection with it so you can control gravity with its magic theory"

Arima explained and smiled "Let me show you" He closed his eyes and slowly opened them, they were already glowing because of his sigil. When the students realized that Arima had cast a magic, they felt a slight shaking at their feet and they were suddenly pressured by a strange force. They had to give their best to not fall under the pressure. Around the entire room, the sound of the chairs cracking was resounding.

"That's just triple gravity" While his students were struggling, Arima casually said. He then closed his eyes one more time and the pressure vanished. At the same time, the chairs were repaired. Everyone sighed in relief and looked at Arima.

The latter smiled at them "Well, you felt it, right? It wasn't neutral, s.p.a.ce, or wind magic, but it indeed was mana imbued with the earth affinity" He declared and the students silently listened.

"Let me show you something else" Arima raised his palm and a blue transparent cube formed above it, at the same time, Arima's sigil revolved.

"[Cavum Nigrum]" He chanted and a black disc appeared in the cube. It looked like a spiral of darkness with a pitch-black center.

"This a black hole" Arima grinned and said as he exhibited the cube by making it hovering around the cla.s.sroom "It's a gravitational field so strong that it even traps any radiation, nothing can exist in a black hole, no matter, no light" He explained "It's commonly created when a star dies and close on itself, creating a zone of inescapable gravity"

"Do you understand?" Arima observed his students and grinned "This small black hole is currently contained in a s.p.a.ce cube I created. Do you know what could happen if I released that cube?" He asked and his students shook their heads.

Only Ofia and Arister paled when they heard that, if they understood correctly, that thing was more than dangerous.

Arima smirked "If I released it, even as small as it is, it would destroy at least half of this continent and maybe suck every last air present on this planet. Only people at the eighth level or higher would be able to survive it" He said.

The students' minds froze, a few seconds later they all gathered in one corner of the room, as far as possible from that cube in the air.

Arima laughed at the sight, he pointed his hand at the cube and clenched his hand into a fist. The cube instantly compressed the black hole and disappeared. Everyone breathed out in relief.

"Of course, I advise you to not try this magic unless you're able to lock a place with s.p.a.ce magic. Unless you want to die because of your own magic and kill millions, and maybe billions, at the same time" He grinned and looked at his students while saying that.

He then stood up and headed toward the door of the cla.s.s with his student's eyes following him "It's the end about base elements. From today onward, for three days, I'll answer every question you could have. And after that, I'll enter in the non-elemental topics"

Arima instructed and left with Lanya and Night.

****************************************

In a strange and huge garden, which now had a gloomy atmosphere filing it. Lilis touched the image projected on the water, and a grave voice resounded.

"User: Zesta Lilis, G.o.ddess of Worldly Emotions/" The voice resounded strongly in Lilis's ears.

"Key granted: Azes Kaeles, G.o.d of Order/"

"Target of the rewind: Arimane. R. Blade, The Kind Demon, Death Hunter, Silver Emperor/"

"Arimane…R?" Lilis muttered, she never heard Arima talk about a middle-name "And Silver Emperor? He actually became one since the last time I saw him?"

"Target judged: Criminal/" Lilis thoughts were interrupted.

"Target's threat: Highly dangerous/"

"Target's past: Recorded/"

"Target's future: ... /"

"Mh?" Lilis was confused, why did it stop. Although the Time Garden only showed the past of an individual, it could predict the future to understand the target better. This garden is a place that even High G.o.ds don't know the operation behind. It was something that was left by the Original G.o.d apparently.

"Target's future/" The voice repeated "Expected to be a Plane Guardian/"

Lilis was baffled, she didn't know what was a Plane Guardian at all.

"Rewind accepted. Starting/"

The image on the pond started moving.