All of the teachers had a transparent shield through which their people looked distorted.

Kaichi also had a shield on his head, and the shield was flickering and flickering, looking a little fragile. All of them have shields on them, it's just that it looks like someone's shield doesn't work very well, and even if they have a shield, they cover their ears with their hands.

Jia Yi plucked his ears with his hand, feeling much better, he breathed a sigh of relief, opened his mouth and was about to speak, but suddenly remembered that his shield was a vacuum shield, which was used for sound insulation, and he couldn't speak at all.

It was twelve o'clock, when the clock tower was officially activated, and because it was twelve o'clock, it was the time to ring the main bell, and all the teachers, no one reminded them, everyone was under the bell, and when the main bell rang, it was like putting a cannon in the ear, and the whole bomber was clouded.

This is not the negligence of any teacher, because a second before the main bell rings, all the teachers invariably raise their shields, or the kind of shields that have a vacuum layer on the outside of the shield, which is specially used for sound insulation. Jiayi was originally bombed, but when he saw their operation in Orlando, he also reflected it, struggling to hold up the soundproof shield.

Fortunately, when Kaichi invented the sonar detection circle, Orlando taught him how to turn ordinary magic shields into soundproof shields when he showed him his shortcomings, otherwise now, like the rest of the students, he can only hold up the shield and cover his ears.

It is not very difficult to add a vacuum layer between the spell shields, even a beginner mage can do it after a while, which has also led to the decline of sonic spells, and few mages have learned. If it weren't for the fact that Warcraft didn't know how to do this, it would be useful when cleaning up some small and large numbers of Warcraft such as bats, and this kind of spell would have almost been eliminated.

It is also because there are relatively few such spells, and the average student will not list this spell as the highest priority to learn, after all, it is easy to learn and less useful, so when necessary, it is good to prepare in advance.

The vacuum's blocking effect on sound is so good that you don't even need to make this shield very strong, because the sound can't break through the vacuum layer at all, and the shield used to rely on the vacuum layer in the back doesn't need to consider whether the shield will be shattered by the sound, resulting in this "spell" not even being a real spell, but only a spell casting skill.

But now under the bell, people who have not learned this spell casting technique are unlucky, no matter how simple the skill is, it cannot be performed without practicing eagerly, let alone under a few bells, people without a shield have begun to dizzy, cochlear beeps, how can it be possible to cast a vacuum shield.

There were even students who didn't think about the vacuum shield at all, and in a hurry, they saw that others could only use the shield they were most familiar with, and thought that someone had attacked them.

Fortunately, the bell only rang twelve times, and not all of them knew the vacuum shield technique, so four or five unlucky ghosts suffered the most, and after covering their ears and persevering for a while, it was over. However, even if the voice is heard, these students who are not protected by a vacuum shield are tinnitus, chest tightness, and dizziness. High-intensity sounds can disrupt the cochlea and make a person's sense of balance unbalanced. If it were on Earth, it would probably result in permanent hearing damage, but in this magical world, a pair of potions would be fine.

After the bell stopped, everyone removed the shield, and all the students dared to look at these teachers in front of them angrily, even the students who used the soundproof shield suffered a lot of losses when the bell rang for the first time, and if they reacted slowly, they would suffer the second time.

Jiayi looked at Orlando pitifully, feeling that he was worshipping a fake teacher, there was no reminder at all, he just went to ask him what the special effect of the main clock was, it couldn't be loud.

"Teacher~~~" Jia Yi shouted, his voice was sad and tactful, and he felt like he had been wronged.

Orlando was embarrassed for a moment, but it was gone in an instant, what the apprentice was used for, wasn't it just for fun, otherwise life would be so boring.

But whether it should be appeased or appeased, Orlando touched his chin and said, "Hehe, this is to exercise your reflexes." You look at so many of you, not one of them even thinks that the bell is too responsive to the problem that should be avoided, and there are so many people who haven't even mastered the vacuum technique, which is too undeserved, although sonic spells are relatively rare, but it doesn't mean that there are none. You're still a little slacking off, and I hope you can learn a lesson. ”

Jia Yi rolled out the whites of his eyes and looked at the teachers in front of him, if he hadn't been misled by them, no one would have remembered the problem of the bell, but the teachers were all here, and there was no hint at all, so everyone followed the teacher's reaction, but I didn't expect them to be so thieves, and they only raised their shields a second before the bell remembered, and by the time Jia Yi and their students reacted, they had already endured the first wave of magic sounds.

"Teacher~" Jia Yi's voice came faintly, as if he was enacting a horror movie again, "Didn't you say that the effect of the main bell will be known when it rings?" ”

"You guys, you still don't pay attention. ”

Hearing Orlando say this, Jia Yi felt that the whites of his eyes were rolling too much, and some of them couldn't go back, and he was too late to block the sound just now, so did he still have to listen carefully.

Orlando didn't care about Jiayi's eyes, anyway, it's not one or two who roll his eyes and slander at them now, just write it down and take it slowly. He continued: "The sound of the main bell is clear, and one effect is that it is far away, and you don't look at the sound here, but it will not be noisy under the tower, and the attenuation is reduced, and the sound can be heard very clearly even on the surface of the lake more than ten miles away. And this sound also has the effect of expelling demonic beasts, and it also has the effect of suppressing some monsters with negative energy. ”

"Disperse the demonic beasts, so tender to expel the sea dragon?" Jia Yi was a little curious, originally thought that this effect should be added after encountering the sea dragon, but after thinking about it, the sea dragon was only encountered after the bell was cast, should it be said that the academy is still quite far-sighted?

Orlando said: "If it is a sane sea dragon, then it will probably be expelled, and the bell will make the monster feel uncomfortable, and the larger the beast, the more uncomfortable it will be, and then stay away from the source of the sound." But this is not lethal, and if a monster can tolerate this noise, then the expulsion is ineffective for it. ”

Jia Yi felt a little disappointed, this effect doesn't look so powerful, and the price is still so expensive, but thinking about the original effect of this thing is to tell the time, I don't feel too difficult to accept.

"Now that the bell has been connected to the academy's alert array, if there is danger, then all the bells will think about it together, you have to remember this, although no one has dared to storm the academy for hundreds of years, but it is not impossible if there is another crazy sea dragon. Although the sound of the main bell has the effect of expelling the monster, it can also anger the monster. Orlando continued.

Jia nodded to indicate that he knew, and glanced back at the big clock above his head, if there were more, he could form a set of small clocks, although the two were not actually alike.

Orlando seemed to see that Kaichi was not satisfied with the effect of the main clock, and said, "Adding these functions to the clock is just for the icing on the cake, and I don't expect these functions to make a big difference." The protection of the academy has always been a whole, not a bell or a magic array. However, these clocks do have some other functions, which you will find out later. ”

Jia Yi was a little speechless, and this sentence was again, shouldn't he have forgotten what function the main clock has.

Now that the clock tower has been officially put into operation, everyone has relaxed, and there is finally a high end to something. Kayi and the others looked at each other and seemed to smile. After a little more patrolling of the main clock, they all slowly left.

Before leaving, Orlando called out to Jiayi and said, "Jiayi, you come to my office tomorrow, I have something to tell you." ”

"Okay, teacher. ”