The morning training lasted until eight o'clock in the morning, and finally Rhine and Hallest, led by middle-aged people, finally went to the cafeteria to eat their first meal in two days. After eating, the two men were arranged by a soldier who claimed to be the squad leader, and were sent to assist the mechanic in checking and repairing various equipment.

La Nina also went out after breakfast, but instead of going to the training ground to find the two teenagers, she went to the lookout at the giant gate. The giant gate is more than 200 meters high, and the demons below look like ants from above. La Nina looked around, the demon clan didn't look like it was going to attack, if nothing else, the plan went smoothly tonight, next time the demon lord would have no return!

"Alas, what a coincidence, you're also here to see the scenery?" As soon as Harrester reached the gate, he looked at La Niña standing in the wind like a ghost.

La Nina cut her hair and looked back at a mechanic and two teenagers who had just climbed up. "Are you really here to see the scenery? If you don't complete the task well, you won't have anything to eat at noon, right? ”

"Shut up, it's not you who give you food anyway!" Harrester took out the wrench that had been hidden behind him at the beginning and twisted it around it in protest.

"Come on, hurry up and get to work, finish early and rest early!" Rhein gave Harrest a push and followed the master forward. "Oh, by the way, I'll tell you quietly, we ate a lot in the morning!" After passing La Nina, Rhine turned around and taunted, saying that they were not men who would starve to death easily!

La Nina felt that it was okay now anyway, so it was better to follow and take a look, and after a while, when there was a problem, the two teenagers still asked her, and then they could take the opportunity to show off again.

There are a lot of magic cannons on the pass, and the task of the old mechanic on this trip is to check the quality of these magic cannons.

"You two little ones haven't touched this thing yet, so I'll leave the inspection to me, and you can follow me with the tools." The old master doesn't talk much, but he talks very kindly, and he doesn't belong to the kind of old man who talks little and is withdrawn.

Rhein and Hallrest nodded repeatedly, and the two of them obediently followed behind the master, saying that they were quite curious about the magic cannon.

It is also rare to close this type of magic guide cannon in the entire continent, because many places don't use this old-fashioned model anymore, and the two hundred and forty giant cannons on this giant gate are not known from when.

"Although the models of our batch of magic guide cannons are very old, they are not much different from the current new models in essence, it is just that the appearance and power are a little inferior." The old master has a deep affection for these magic cannons, and he is not willing to belittle them easily.

"Master, when we were children, the two of us bought black powder and made that kind of earthen cannon, which is the kind used to fight pheasants." Rhine remembered how happy he was at that time, he and Harrest didn't go to school, and they played around all day......

"Oh, hehe, that kind of gunpowder cannon, I know, I really miss it, I played it when I was a child!" How many years has the old master not recalled that dusty childhood...... "That kind of earthen cannon is also very good, and people without magic can easily control it, and it is perfect for driving away wild beasts for farmers." ”

"Master, we both know the principle of that kind of earth artillery, but we just discussed this kind of magic cannon, and we can't understand it at all! Can you tell us how this magic cannon works? Harrest's curiosity drove him to know these unknown secrets.

La Nina was standing next to her, but the three men who were there to repair her completely ignored her...... At this time, she waited for the old mechanic's "I don't know ahaha......" and then appeared!

"Actually, the principle is very simple! Look at the inner cavity of this magic cannon, there are many inscriptions carved in it, and each inscription is equivalent to a formation. The magician infuses it with furious magic, which produces different effects when passed through different inscriptions. When the magic enters the magic cannon, it will first undergo a conversion inscription, and the furious magic will be transformed into controllable magic; Then go through the crystal nucleus inscription, which will make the magic resonate with the crystal nucleus in the magic cannon, and achieve an increase in power; Finally, after the condensation inscription, the huge mana is compressed and then launched in the form of a beam or cannonball! "The old mechanic hadn't talked about it for a long time, because no one had been interested in it for years......

"Wow! It's amazing! If I'm not mistaken, the so-called inscription should be an upgraded version of the formation, right? The formation is constructed by magic power, and it will soon dissipate, and this inscription is engraved on this special metal or crystal nucleus, ore, and it should be able to be preserved for a long time, which is why these magic cannons can be used for a long time, right? Rhine benefited a lot from the master's explanation, and he actually guessed the effect of the inscription that he had never heard of.

"Oh! The little guy guessed accurately! Indeed, these inscriptions are usually inconspicuous, but they activate as soon as the magic flows through them! "The old mechanic is very fond of this kind of active teenager.

"Alas! Why did you think so quickly, I almost figured out what this inscription does! "Harrest didn't expect Rhine's brain to be so good......

Damn...... This old mechanic is not simple, not only explains the esoteric principles in an extremely easy to understand, but also refines and corrects! If it goes on like this, I won't have a chance to play...... La Niña looked at the three people in front of her who were crouching on the ground foaming at the mouth......

"But ah, although the principle of this magic cannon is simple, the actual operation is very difficult whether it is the production of the mechanic or the control of the magician! For a magic cannon like this, the inscription inside can only be engraved by a fifth-order mechanic, and the magician who controls this magic cannon must be at least second-order! "The master thinks that he can't just say good, and the problems in these fields should also be talked about with these little guys.

Although it is now the era of creation, the cultivation of one's own strength will always occupy the most critical position. People on the continent are far less interested in these mechanical inscriptions than they are in advocating to improve their own strength. And most of the people who use these magic guides don't know anything about these magic guides at all. Maybe that's the downside of the Magic Black Box...... Let those who don't know the principle use it, and let those who can use it not explore the principle......

"Indeed, grandpa is not wrong at all, if I were to carve this kind of inscription, it would take a few days!" La Niña poked her head out from behind and said.

"Aren't you a magician? How can you still engrave the inscription of a mechanic? Rhine was calm about La Niña's sudden appearance.

"Carving inscriptions is originally our magician's specialty, and although mechanics can also carve, they are definitely not as good as us!" La Niña unconsciously flaunted.

"Well, what La Niña said is that we mechanics not only have to engrave the inscriptions, but also design the appearance of these magicians, choose the right materials, and so on...... Therefore, in terms of seal carving, we are indeed not as proficient as the magicians of the rank. The master sighed, if only the magicians didn't blindly study magic, but came to help them share the carving of the inscriptions......

Later, La Niña naturally joined the small group, and the four of them roamed the giant gate, and no damaged magic cannon could escape their eyes.