Most of the monks of the Heavenly Demon Sect who were watching the battle on the city wall were confused and did not understand what these monks of the Corpse Yin Sect were doing.

However, Ru Jiang Chen and other monks in the Foundation Establishment Stage saw some signs. The twelve monks seemed to be casting a large spell, but their movements were extremely slow. After about half an hour, they had not cast it yet.

"Senior Brother Jiang, what is the name of this cultivator of the Corpse Yin Sect doing? The twelve people sneakily seemed to be posing some formation." Bu Zheng said with a hint of confusion.

"Yes!" Jiang Chenyi nodded, then turned his head to ask Zheng Yiran, "Yiran, you have studied the formation in the past two days. Can you tell what they are going to do?"

Zheng Yiran looked at the group of cultivators from the Corpse Yin Sect for a while, then took out the formation book given by Jiang Chen for a moment before closing his eyes and falling into deep thought.

After about a cup of tea, she suddenly thought of something and changed her color in shock and said, "Senior Brother Jiang, do you think they are all cultivators who use fire-attribute skills?"

Jiang Chen's spiritual consciousness is comparable to that of the Jindan stage monk. He released his spiritual consciousness, and after looking around for a while, Fang nodded and said, "I see the actions and spells they cast, and the spells they are about to cast seem to be fireball techniques. It is estimated that most of them are cultivators who have practiced fire-attribute skills."

"I understand! They are setting up a group amplification array! I want to use this to break our city-mopping array!" Zheng Yiran said with a serious expression.

"What kind of formation is the group amplification array? Can it break our city-mopping array?" Bu Zheng, Wan Liang, Wang Zihan and others were a little disbelief.

"Senior Brother Jiang, the magic of the immortal cultivation world is usually divided into five levels: heaven-level spells, earth-level spells, human-level spells, mysterious-level spells and yellow-level spells, and each level is divided into three levels above, middle and lower. Most of these spells are cast by a single monk. However, the attacks of the magic and magic weapons of the monks in the foundation-building and Qi Refining stages have no effect on our city protection formation. Even if several Jindan-level cultivators attack, it will be useless..." Zheng Yiran looked at her pretty eyes and explained to everyone.

Then, she explained in detail the specific situation of the group amplification array to the cultivators of the Heavenly Demon Sect beside her...

According to Zheng Yiran, this is also what she said in a formation book she accidentally read before.

According to the book, the group amplification array is performed by a large group of monks. It is very difficult to cast this kind of spell, and it must meet many conditions.

The first thing is to find a large number of monks who specialize in practicing the same attributes, and the number must be based on the requirements of this magic circle. For example, the group of monks in the Corpse Yin Sect now should want to cast a fireball technique. Therefore, twelve foundation-building cultivators who practice excessive attributes of the fire are concentrated and perform according to the position of the group amplification array.

The fireball technique cast through this magic circle is surprisingly powerful. However, there is also a big disadvantage, that is, it is to cast too slowly. By the time the spell is cast, the enemy may have run hundreds of miles away.

When cultivators in the immortal world have a fight, at most dozens of cultivators make small fuss, they don’t need such a slow-moving magic array.

Therefore, it can only be used occasionally when large-scale siege battles or attacking mountain gates of other sects. Now, it is obvious that the monks of the Zi Yin Sect, under the command of the formation master, want to use the spells cast by this group amplification array to bombard the city-shadow formation around the city.

"Senior Brother Jiang, you can't let the enemy set up slowly there. We should go out of the city and attack them!" After hearing Zheng Yiran's introduction, Bu Zheng changed his mind immediately.

Jiang Chen smiled bitterly at this time, "What we can think of, Yan Nannan also thought of, look at the current situation in front of the city gate!"

Bu Zheng and others raised their eyes and looked down. They were also shocked. At the city gate, Yan Nannan personally brought sixty foundation-building cultivators, one thousand Qi Refining cultivators, and 30,000 body refining cultivators, looking at the city gate. It seemed that as soon as the city gate was opened, the cultivators of the Heavenly Demon Sect inside would immediately cover up and kill them.

Seeing this, Bu Zheng was speechless and dared not say anything about the battle. His army was obviously weaker than the enemy. If he relied on the city wall, he might be able to fight and go out to fight against them in the field and fight for the enemy. He would definitely lose all his remaining capital.

"Don't panic first! Even if they really break the city protection formation, we still have spirit stone cannons. They may not be able to break through our city so easily!" Jiang Chen said in a deep voice.

Everyone thought that, although these spirit stone cannons equipped with sights have a limited range and cannot hit those enemies a hundred feet away, they will definitely cause major casualties to the enemy after the ban disappears and the enemy launches an attack.

So, everyone's heart, which was originally a little panicked, calmed down again.

After setting up the formation, the twelve foundation-building cultivators of the Zi Yin Sect joined 240 Qi Refining cultivators under the command of Chen Zhen to transmit spiritual power to them.

It took them an hour to cast the fireball spell.

At this time, a giant red fireball with a diameter of more than ten feet was seen blooming with dazzling red light. It floated above the elliptical group amplification array. This giant fireball lies across the sky. If it falls, it will probably kill at least hundreds of low-level monks.

Seeing this, the monks of the Heavenly Demon Sect in the city all looked shocked. Even the monks of the Foundation Establishment Stage, such as Jiang Chen, Bu Zheng, Wan Liang, etc., could not help but change their expressions.

Fireball Technique is the most basic fire-type spell. Almost all fire-attribute monks learned fireball Technique when they first practiced spells. Even monks with multiple spirit roots who have fire spirit roots but are not majoring in fire-attribute martial arts often learn a fireball Technique to burn food or destroy corpses and traces.

When a single monk uses it, even if it is a Jindan stage monk with the fire spirit root, it will be about three feet in diameter at most. However, this fireball is so huge, and its power is more than ten times stronger. Even if it is a Jindan stage monk, facing such a big fireball, he will probably only have one ending with being burned to ashes.

The cultivators of the Heavenly Demon Sect are now beginning to worry. Although the light shield of the city protection array looks dazzling, it is still unknown whether they can withstand the attack of such a huge fireball.

However, because Yan Nannan specially organized manpower to protect the monks who cast spells. In addition, she herself led a large number of troops outside the city gate, preparing to attack the monks of the Heavenly Demon Sect head-on. Therefore, Jiang Chen did not order people to be sent out to stop the monks of the Corpse Yin Sect from casting spells.

Without any interference, the twelve foundation-building cultivators from the Corpse Yin Sect finally released the giant fireball smoothly with the support of 240 Qi Refining cultivators. Then, under the guidance of Chen Zhen in the center of the formation, the twelve cultivators drove their spiritual power with all their strength, allowing the giant fireball to hit the light shield formed by the city protection array.

The big fireball slowly collided towards the protective light shield with a red light, and the speed became faster and faster...

There was only a loud bang. In the public eye, the giant fireball hit the light curtain formed by the protective array. The light curtain stirred up layers of five-color waves and dazzling red light. The huge bombardment caused the entire city walls and the earth to shake violently.

Some timid cultivators in the Qi Refining Stage of the Heavenly Demon Sect on the city wall have closed their eyes and dared not look at the situation where the collision occurred.

When the light of the impact dissipated and the rumbling sound gradually disappeared, the cultivators of the Heavenly Demon Sect in the city realized that the light of the protective light curtain had dimmed a lot, and the giant fireball had already turned into ashes and disappeared in the violent impact.

After a while, a second giant fireball began to form in the air again, and then after an hour, it hit the protective light shield again, causing the light curtain to flash and turbulently.

Fortunately, the city-protected formation was stronger than they thought. Finally, it blocked the terrifying fireball again and was not broken. This made the monks of the Heavenly Demon Sect in the city breathe a sigh of relief.

However, Jiang Chen and others didn't feel relaxed for long, and they became worried again.

Because they discovered that under the organization of the formation mage, twelve other water-attributed foundation-building cultivators began to gather together, and then issued an extremely huge water arrow technique and blasted towards the city-sharing formation again.

As time passed little by little, the city-moulder formation gradually dimmed under the repeated attacks of those huge fireballs, water arrows, earth cones, golden swords, and wood. This was obviously a sign that the formation was about to break.

Although the monks of the Corpse Yin Sect who cast spells were also sweating, and the formation mage in the center of the formation also looked listless, it was obvious that there was no problem to support a few more attacks.

Finally, after taking a recovery pill, the formation mage once again guided the cultivator of the Corpse Yin Sect to emit a huge golden sword.

The golden sword, with a powerful aura and violent spiritual power fluctuations, pierced into the top of the light shield above the city wall...

There was only a "boom" sound, like a shocking sound. The city-mopping formation that had lasted for nearly a month was actually broken.

All the monks of the Heavenly Demon Sect on the city wall and in the city felt a violent vibration on the ground beneath their feet, making them unable to stand firm.

The five Foundation Establishment Cultivators who were originally guarding the formation flag and the formation eyes all spit out a mouthful of blood and suffered serious internal injuries.

Looking at Wunan City, who had lost the city-modification formation in front of her, Yan Nannan also showed joy. She immediately raised the long whip in her hand and pointed to the front, saying, "Attack! Now rush up for me! We will go to the city tonight for the night! I will allow you to have no military discipline for three days!"

"Long live the Great Elder!" The monks of the Corpse Yin Sect seemed to see the beauties and treasures in the city waving to them, and they all rushed towards the city wall as if they were injected with chicken blood.

The Qi Refining Cultivator and the Body Refining Cultivator rushed up with the ladder, while the Foundation Establishing Cultivator flew directly towards the city wall, trying to occupy the city wall to cover the army to climb up the city.
Chapter completed!