Before the demons had rushed into the dense fog of Yin Mountain, the news of their attack was learned by Su Mu.

It's all the work of the Painted Skin Demon!

After this period of experience, the Painted Skin Demon is more handy at spying on intelligence.

They are like Su Mu's eyes and ears, hidden on the periphery of Yin Mountain, and they can clearly grasp every move of the demons and ghosts.

And at this moment, on the periphery of Yin Mountain, there are countless small monsters like the Painted Skin Demon, and the Painted Skin Demon is mixed in them, even if it is a big demon lord such as the Hejiao Demon Lord, it is difficult to find that there is a problem with them.

What's more, the big demon lords such as the Hejiao Demon Lord never thought that these little monsters, who were as inconspicuous as ants in their eyes, would be rebelled by cultivators, and they also had the courage to become undercover agents and eyeliner.

In the Yin Mountain, in front of the Great Wall.

Su Mu, who was still building a poison array, received the latest news from the Painted Skin Demon and immediately ordered an artillery bombardment.

At the same time, he also said to Yin Monkey and the others who had withdrawn and were helping to build the magic circle here: "The demon can't hold back and starts to attack." Thankfully, you have already pulled out of the fog, otherwise it would have been dangerous. ”

Yin Monkey immediately patted his ass: "It's all ordered by Su Mu's classmate in time." Your grasp of the situation and the enemy's situation has thrown us countless streets. ”

The surrounding classmates looked at him in surprise, thinking that he was a little too fartty.

But the monkey didn't think there was anything wrong with that.

Shoot the boss's sycophants, don't lose the monkey.

Su Mu smiled, didn't say anything about the monkey's sycophant, just beckoned everyone: "Let's go, it's time for us to return to the Great Wall." ”

At this time, a 'Xiu Xiu Xiu' sound of breaking the air came from behind the Yinshan Great Wall.

At the same time, people saw cannonballs with runic brilliance rising into the air.

Some students were puzzled by this: "Teacher Su, is it a little too early to fire the cannon at this time? ”

Su Mu leaned back with a tactic, but he almost fell down because of his back, but fortunately, the waist of the single dog was good enough, so he stabilized and did not get embarrassed, and said with an embarrassed smile: "It's okay, let the shells fly for a while!"

The classmate had a question mark on his face, and wanted to ask again, but he saw Lin Jian'e next to him, as well as many students majoring in flying swords on the Great Wall, all of whom had shown their swordsmanship at this time.

The cannonballs that flew into the sky flashed with runes, as if they were responding to the classmates of the flying sword major, and they really did not fall immediately, but were suspended in mid-air, like flying swords controlled by the imperial sword technique.

Seeing this scene, more people were surprised and puzzled, and asked the flying sword students they knew: "You can actually resist cannonballs? Why didn't you know you had this ability before?"

The students majoring in flying swords, while controlling the rune cannonballs, replied proudly: "Amazing, right? These are all new skills that Teacher Su taught us!"

It turned out that after getting a series of munitions weapons, Su Mu was studying what to do in order to better and greater the power of these munitions weapons.

After some exploration and attempts, Su Mu combined the technology of swordsmanship and munitions, as well as the principle of drones, and other knowledge through the interdisciplinary fusion function of krypton gold plug-in, and improved and improved.

In the end, he succeeded.

Got an advanced version of the sword art - the egg...... Ah no, it's the Bullet Technique!

If it's an egg, it's even more terrifying...... But if it's a male creature, you have to hide.

Otherwise, let you experience what it feels like to have the idiom of 'chicken flying eggs'.

With the anti-bullet technique, coupled with the control of the flying sword professional students, and combined with the demon energy monitor, even if the dense fog of Yinshan obscures the line of sight, it can also achieve accurate strikes against demons and ghosts!

Even under the control of Lin Jian'e and other flying sword majors who knew sword formations, these rune shells were still in mid-air, forming sword formations one by one...... No, should it be called a projectile array, or a fire net?

Some students saw through the rune telescope that these cannonballs were arranged in formation in mid-air under the control of the anti-bullet technique.

Some of them present SB formations, and some are NB formations, and students like Lin Jian'e who are relatively high in flying sword majors can also make these shells form a more complex formation like X**D.

This also made many people admire: "As soon as you look at the formation, you can know that these students majoring in flying swords are all high-achieving students who have studied in Zu'an!"

On the way back to the Great Wall of Yinshan, Su Mu patted the gourd pinned to his waist.

After the eye lines on the gourd opened, he said: "Help me spread a message, I am about to open the [Homecoming Gate] in the secret realm of Yuanqiao, please Principal Wen and they are ready to support as soon as possible!"

"Are you really using me as an operator?" came the disgruntled hum of the drum from inside the gourd.

But no matter how dissatisfied he was, he still passed Su Mu's words out of the secret realm of Yuanqiao at the first time.

This time it's not because Su Mu gives too much, but because Su Mu owes a lot.

If Su Mu hangs in the secret realm of Yuanqiao and owes him money and wine, no one will give it.

Gu Ke didn't want to work hard, sell blood and saliva, and put down his identity to work part-time as an operator and courier, and all the money and wine he earned came to naught.

After passing on Su Mu's words, the drum shook the wine bottle that he had drunk most of in his hand, and sighed very embarrassedly: "I used to hear people say that the one who owes the debt is the uncle, and I still don't understand it." Now I understand, this debt is really uncle!"

Su Mu didn't know what the drum was complaining about, and he wouldn't care if he knew, and he might even use the identity of the 'Uncle in arrears' to make the drum stick more busy.

After he withdrew to the Great Wall of Yinshan with Yin Monkey, Lin Jian'e and others, he immediately called his classmates and Su Ye, who had not yet built a foundation.

"You all know the method of activating the circle and opening the [Homecoming Gate], right?"

Seeing that these classmates who had not yet built a foundation were nodding, Su Mu continued: "The situation is urgent, I won't talk nonsense." After you return to the human world, quickly inform the location of the entrances and exits of the secret realm to the various cultivation academies, and ask them to send people over for reinforcements as soon as possible! Whether we can defend the Great Wall of Yinshan Mountain, and whether the students can shed less blood and sacrifice less, is up to you!"

Although these students who have not yet built a foundation want to stay and fight side by side with everyone, they also have self-knowledge.

They know very well that their strength is inferior to those combat-type rune figures, and the role they can play if they stay is limited, and they will even become a burden and cause trouble for everyone.

In contrast, it is indeed a better choice to leave the secret realm of Yuanqiao and return to the world, guide the direction of the reinforcements, and tell the information in detail.

Moreover, Su Mu's words also magnified their role, making them feel that they were leaving the secret realm at this time, not as a deserter, but with a very important task.

For a while, the students who had not yet built a foundation were all enthusiastic and said: "Teacher Su, don't worry, we will definitely call reinforcements as soon as possible!"

Su Mu arched his hand and said solemnly: "Please!"

Only Su Ye objected: "I think it's more useful for me to stay." ”

Without waiting for Su Mu to open her mouth to refute, she quickly gave the reason:

"First of all, I've already built a foundation, and although I can't use spells, I can use weapons such as star-picking cannons, and I still have some combat power.

Secondly, my luck has always been good, and if I stay, I can add a luck buff to everyone. The luck on the battlefield is also very important. Like Emperor Guangwu, it was because of his luck that he was able to trigger a meteorite to fall from the sky and turn things around in one fell swoop!

In the end, I am a little bit good at grasping the battle situation and commanding operations, and I will definitely be able to help you. ”

Su Mu let Xiao Yezi go, because he didn't want her to be in danger, but the reasons listed by Xiao Yezi were reasonable, so he couldn't refute them.

In fact, Su Mu also knew that Xiao Yezi insisted on staying, in addition to really being able to help, he was also worried about him and didn't want him to be in danger alone.

"Okay, then you can stay!"

The situation was urgent, Su Mu didn't waste time on the relationship between his children, and after a little consideration, he agreed to Su Ye and let her stay.

However, secretly, Su Mu was quietly spreading the word to the vegetable cat and the scarlet carp.

"You must always stay by Xiao Yezi's side and protect her safety. When I ordered you to take her away, no matter how she reacted, you had to take her out of the Yuanqiao Secret Realm, even if it was to knock her unconscious and take her away, understand?"

He had to anticipate the worst-case scenario.

The vegetable cat and the scarlet carp listened to Su Mu's words, their expressions changed slightly, but they didn't say anything, just nodded lightly, indicating that they understood.

The students who had not built a foundation soon arrived in front of the [Homecoming Gate], and they pricked their fingers one after another, dripping blood, and activating the magic circle.

At the moment when the [Homecoming Gate] opened, both the demons and ghosts outside the Yin Mountain and the cultivators in the human world were all aware of it.