There was a quiet silence in the "Seventh Classroom", and the students all remained still, communicating with their cave according to the method taught by Feng Baimei.

Some people stood quietly, some sat cross-legged on the ground, some simply lay on the ground, everyone closed their eyes tightly and held their breath.

Before I knew it, half a day had passed.

"Alright, fellow students. Feng Baimei interrupted everyone's meditation, "It's time for lunch, let's go to the cafeteria to eat first, the afternoon class will be changed to the 'third classroom' in the East Second District, and I will teach you how to use telepathy to find the quenching materials suitable for your cave." ”

All the students stood up and walked out of the classroom.

The vast majority of the students are still clustered around the little sword god Zhou Binglin as usual, but now there is a small group in this class, and Lu Zhan is also surrounded by a few classmates, in addition to Qingyin, there are several more male and female classmates such as Long Tianao, Ximen Feixue, Li Yuerong, Fan Qingqing, etc.

"Everyone!" Long Tianao excitedly announced: "Today's battle is really happy, we not only defeated the invincible little sword god Zhou Binglin, but also made a big profit from his supporters, a full seven hundred desolate beast cores, today I have a treat, let's order a few big dishes, of course, if anyone wants to eat that plate of 'ecstasy mussels' again, Uncle Ben will still order one for him, who wants?"

"I want to. Li Yuerong raised her hands and shouted.

Qingyin glanced at her, "Do you still want to eat this? Have you forgotten how you survived last night? Although I live upstairs from you, I can hear your cry through the ceiling. ”

"How can you forget this experience?" Li Yuerong smiled: "But it doesn't matter, this girl will sleep with a log today, and bite a small wooden stick in her mouth if necessary, so that she won't quarrel with you." ”

Long Tianao on the side joked: "You have to sleep with a piece of wood, it is better to sleep with me, no matter how you say it, I am also a man with a living flesh." Small meat sticks are always much more fun than small wooden sticks. ”

"What are you talking about?" Li Yuerong bared her teeth and said angrily: "I, you big rascal, see if I don't tear your stinky mouth." ”

"The gentleman doesn't move his hands. Ouch, it hurts me to death, why are you pinching me?" the two ran in the direction of the "exit" after each other.

Lu Zhan and several other classmates walked towards the "exit" with a smile and a smile, and at this moment, Lu Zhan deeply felt the weight of friendship. In his previous career, most of the time he was alone in loneliness, lonely struggle, and it was rare to have such a moment when there were a few friends standing beside him who were willing to fight side by side!

In the afternoon, the class was changed to the "third classroom" in the second east area of the teaching area, which was simply an exhibition room for quenching materials. The room is filled with all kinds of materials for quenching "cyclone cannons" and "spiritual light cannons". There are even materials used to quench the "Xuantian Cannon" of the Venerable Lord-level Cave Mansion.

Standing in the center of the classroom and looking around, I saw that there were hundreds of rows of display shelves neatly stacked in the classroom, and each row of display shelves was full of various materials, some of which looked inconspicuous, some radiated bright light, some were like crystals, and some were metals, and there were tens of thousands of kinds of colorful displays.

"Attention, everyone. Teacher Zheng Jun took special care when he opened the door and let the students enter the classroom: "All the quenching materials placed on the display shelves in this classroom are protected by small protective barriers. So everyone is only allowed to look, not touch, if anyone has itchy hands to touch the things on the display shelf, once it causes any damage, don't blame me for not warning everyone in advance. ”

As soon as the students entered the classroom, they dispersed, and they shuttled through the rows of display shelves, admiring the dazzling array of quenching materials, each with a card next to it indicating the name and properties of the material.

It wasn't until Feng Baimei walked into the classroom carrying a bag of quenching cannon material that everyone gathered in front of the podium in the center of the classroom.

Feng Baimei poured the Qiankun bag onto the podium, only to hear a chaotic sound of "crackling", and poured out hundreds of quenching materials from the Qiankun bag.

"Ladies and gentlemen, please look," Feng Baimei said to the students with a gray-brown crystalline stone in her hand, "This is a 'limestone spar', which is the most commonly used material used by Tuyuan Cave Mansion to make 'cyclone cannons', its material is harder than ordinary Yungang, it can withstand extremely high temperatures, and its toughness is also good.

However, this material has a disadvantage, it indicates that there are very small concave and convex points, which leads to a slightly worse finish of the barrel of the 'Cyclone Cannon' made of this material. Barrels with a low finish will slow down the speed and range of the beam emitted, so this material is generally suitable for quenching rotating beams such as 'cyclone slashes'. ”

Feng Baimei grabbed another piece of red wood and said, "This is a 'thousand-year-old dragon's blood wood', this material is very suitable for Mu Yuan Cave Mansion to quench the 'cyclone cannon'. The 'Cyclone Attack Cannon' emitted by each attribute cave has its own characteristics, for example, the attack cannon emitted by the Huoyuan Cave Mansion is mainly red light and flame, and the attack cannon emitted by the Shuiyuan Cave Mansion is mainly composed of water element spells and blue light. The attack cannon released by the Muyuan Cave Mansion is mainly based on Muyuan spells and green light. ”

Lu Zhan remembered that when Ling Yuyao's big tree cave mansion was fighting with the sword slave, purple seeds continued to shoot out of the cave and fall to the ground, and then long vines emerged from the ground and wrapped around the long sword cave mansion flying in the air. At that time, he only thought that the purple seed was a spell released by Ling Yuyao, but now after Feng Baimei's explanation, Lu Zhan understood that the "cyclone cannon" used by Ling Yuyao's cave mansion belonged to the kind of Muyuan spell-type attack cannon.

Feng Baimei continued: "Although this 'thousand-year-old dragon's blood wood' is a commonly used quenching material in the Muyuan Cave Mansion, it does not mean that it can only be used in the Muyuan Cave Mansion, in fact, other cave mansions can also be used, such as the Law Cave Mansion and the World Cave Mansion, these two Cave Mansions do not have the limitation of the five-element factor.

However, the requirements of the law system cave for quenching materials are obviously higher than those of other types of caves, especially if the quenching materials used are not suitable for the cave, not only can not enhance the attack power of the cave, but will cause the power of the cave to decrease, so for the students of the law department of the cave, it is a very prudent thing to choose a material suitable for the quenching of the cave.

And for those who have the highest-level World Cave Mansion, the difficulty of choosing quenching materials is not so high. Due to the wide inclusiveness and compatibility of the World Cave, materials with almost all attributes can be used in the World Cave. ”

As she spoke, Feng Baimei glanced at Lu Zhan with profound eyes, and said, "Maybe those who have a world-type cave mansion will think: since my cave mansion has such a wide range of compatibility, then I can just find some good materials to quench the cannon, and I can launch an attack beam anyway."

In fact, this kind of thinking is seriously wrong, yes, the World System Cave House can accommodate most of the materials, but if the materials used are not suitable for this Cave House, although it can also fire attack cannons, but the power of this cannon is mediocre. Students can imagine how insulting it would be for a person with such a high-level World Department Cave Mansion to release an attack cannon with mediocre and weak power. ”

Lu Zhan saw that Feng Baimei's words were obviously said to him, and because the instructors deliberately covered it up, the students didn't know that Lu Zhan's cave mansion belonged to the World Department.

Feng Baimei continued: "In the morning, I taught you to use telepathic methods to communicate with your cave, so as to find a method suitable for your cave's quenching materials, and next, I will use these quenching materials in front of me to test the sensing ability of your students. ”

As she spoke, she and Zheng Jun lined up the hundreds of quenching materials on several long tables, and then said to the students: "Come up, all of you, choose one of these materials as the quenching materials for your own cave, and I will give you a moment of time." After you have selected the materials to use, we will go to the 'Virtual Phantom Array' and test whether the materials you have selected are suitable for your cave in a virtual way.

Okay, let's come and pick up the materials. ”

Twenty-five students walked over to the long tables and began to select the materials suitable for their cave quenching guns.

I saw that some of them pressed their hands on the material and closed their eyes to sense it, some held the material in their hands to sense it, and some simply put the material on their chest and sensed it with their hearts.

Lu Zhan didn't directly use touch to sense like other students, but slowly walked forward between the long tables, he closed his eyes slightly, and walked forward with his senses.

Suddenly, his heart moved, and he felt that something on the right side of his body seemed to have a very subtle sense in his body, and he opened his eyes and looked to the right, only to see an inconspicuous gray-green stone on the edge of the long table.

He walked up to the stone, held it in his hand, and immediately felt his heart beat faster, and there was an inexplicable excitement in his brain.

He looked at the gray-green stone in his hand, and saw that the stone was like a rotten apple, although it was not big, but it was very heavy in his hand, and the stone showed no luster, but in the palm of his hand, he could obviously sense that there was a very faint qi circulating on it.

"This is a 'Vermilion Bird Flame Stone'. ”

Lu Zhan heard someone next to him being introduced, and when he looked back, it was Teacher Zheng Jun.

"This kind of ore can only be mined thousands of feet underground. Zheng Jun continued: "This mineral rock has been roasted by a strange fire called 'Vermilion Bird Flame' all year round, so the inner essence of the rock already has the attribute of fire element, why are you particularly interested in this stone? Do you think it is suitable for your cave (to be continued. )