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Before coming to class, Fang Yu had already done his homework and knew some general information about the course "Metallic Spell Research".

According to the theory of mutual growth and restraint of the five elements, metallic spells are characterized by sharpness and hardness, so the lethality is very prominent in the five element spells, and it is comparable to fire attribute spells.

The order of the five elements is wood to fire, fire to earth, earth to gold, gold to water, and water to wood, that is to say, people with metal talents, if they also practice some water spells, they will also have better results.

The order of the five elements is Mu Ke Earth, Earth Ke Water, Water Ke Fire, Fire Ke Jin, Jin Ke Mu, that is to say, in the case of close strength, metal spells will be restrained by fire attribute spells to a certain extent, of course, this is not absolute.

At the same time, metallic spells can not only be used to kill enemies, but also extract rare metal elements from ores and smelt and forge them to create suitable blades and magic weapons, which has always been a very important branch of metallic spell research.

It is also because of this that a person who can master the metal technique is still very popular in the circle of abnormal abilities, and many people are also blacksmiths, as long as they can forge an excellent work, they can make a lot of money.

There are also sword control swordsmanship and its branches, metal golem manufacturing, and psionic mechanics, all of which are closely related to metal exercises.

This class is about "Sensing and Distinguishing Metals", which is a basic course for introductory students, especially for students who are determined to develop in the field of forging.

The class was attended by a young lecturer in his twenties, and if it weren't for the fact that he was standing on the podium with a handout, he would not have looked much like a student.

Although he is young, his fame is not small, and many teachers in the school give a thumbs up when he mentions the name of "Ma Ziheng".

Because he himself graduated from Shushan Academy, after two years of social experience after graduation, he published a number of papers on the research of metallic spells, and then was hired by the school as a lecturer, and is currently one of the youngest lecturers in Shushan Academy.

And his attainments in the metallic technique are naturally self-evident.

"All of you have studied the periodic table in high school before, and 90 of the 112 elements that have been identified by the scientific community are metallic elements, but in our allicity world, this number has to be doubled."

Ma Ziheng said while placing dozens of metal ores of different shapes on the podium: "Some metal elements are too scarce in nature, some metal elements are very complex in extraction methods, and some metal elements themselves are very unstable, so in the freshman class, I will experience some simple ones for the time being." ”

"The ores you see now are all raw ores obtained from all over the world through special channels in our college, and the metal elements contained in them are also different, and I will teach you how to sense the metal elements in the ore and how to distinguish them."

He picked up the first piece of ore on the far left, showed it in front of all the students, and put it in his hand.

It was a very ordinary-looking stone, blue-gray overall, with a slight moss on one side, apparently dug out very close to the surface.

Soon, a smile appeared on Ma Ziheng's face.

"The ore contains about 35% metal, including 19% aluminum, 14% iron and 2% potassium."

As he spoke, his fingers slid lightly over the surface of the ore, and tiny particles visible to the naked eye separated from the ore and automatically split into three strands, converging into three small balls of different sizes, exuding a silvery-white metallic luster.

"Wow, that's amazing." The audience was amazed.

Of course, there were also one or two untimely voices: "These three lumps of metal are almost the same in appearance, how do you know that they are aluminum, iron, and potassium?" ”

In the face of doubts, Ma Ziheng just smiled: "Identifying the types of metals is the basic requirement of our course, if you want to be accurate, you may need some large instruments, but it is not difficult to test it briefly in class, you only need to know a certain characteristic of these metals." ”

"Potassium is very active and can react violently with many substances." Ma Ziheng said as he put the smallest piece of metal into a glass of water.

The moment the metal and the water came into contact, it immediately turned into a burning fireball, swimming around the surface of the water, making a clattering sound, and disappeared into invisibility after a few seconds.

"The density of aluminum is very small, but its surface is covered with a dense oxide film, so alloys made with aluminum as the main body are very commonly used in mechanical manufacturing."

Ma Ziheng put the aluminum element on the flame and heated it, only to see that the inside of it was already red and melted, but because it was wrapped in the oxide film outside, it did not drip down.

"As for iron, it has excellent magnetic properties and is one of the best raw materials for making magnetic metal materials."

A magnet appeared in Ma Ziheng's hand, and the iron element was attracted and began to move towards the magnet.

"Discovering and identifying the metal elements in the ore and extracting them is the goal of our class.

After Ma Ziheng finished speaking, he beckoned everyone to come to the podium and each led a piece of ore to go.

"If you concentrate your attention and sink your mind into the ore, you should be able to sense the small dots of different colors in the ore, which are the metal atoms in it."

Hearing what the teacher said, everyone tried silently in their seats, and Fang Yu was naturally no exception.

He received a brown and white piece of ore, with rough tentacles and small holes in it, which seemed to be the result of long-term weathering.

Fang Yu first adjusted his breathing, discarded distracting thoughts, and then focused his attention on the ore in front of him, and gradually the ore in his hand became transparent, and he could vaguely see that there were countless small points of light as small as needletips, making irregular movements at high speed.

Ma Ziheng's voice came from the podium: "Try to input the spiritual energy in your body into the ore, and echo those points of light, if you have a good metallic talent, these metal atoms will automatically respond to your call, so that they can be extracted from the ore." ”

According to Ma Ziheng's prompt, Fang Yu began to operate the aura in his body to the palm of his hand, and then penetrated into the ore, but the moment the aura touched the ore, he found that the light points in the ore seemed to have received some kind of stimulation, and suddenly became much more lively than before, scrambling to converge in the direction of his palm.