Immortal cultivation starts with copying.

While the Tiangang Disha Formation was taking effect, Chen Yunhao took the opportunity to replace the formation plate with a new one and also fixed some problems with the formation.

When the Tiangang Disha Formation can no longer hold on, the two formations can be rotated.

Chen Yunhao doesn't care about any plan to eliminate the monks. After all, they are his subordinates, so he will try to minimize losses and casualties. He will not treat human lives as worthless.

This offensive and defensive battle lasted for nearly ten hours because of the participation of monsters and the attack of demons in the later period.

The formation plates of the city defense formation were replaced twice, which shows how fierce the battle was.

The corpses of monsters in front of the Cold Wind Valley stronghold were piled up more than ten feet high, almost as high as the city wall, and the blood flowing from the monsters had formed a stream.

The demons had been attacking for a long time but were unable to take the city, so they were slowly retreating. Chen Yunhao wanted to burn all the corpses of the demon beasts outside the city.

Unexpectedly, a ray of magic light flew from afar, like a rosy glow, spreading in a fan shape, covering most of the Cold Wind Valley.

Under this magic light, the flesh and blood of those monsters slowly dissipated, and even the blood gathered underground disappeared.

In just a cup of tea, tens of thousands of monster corpses disappeared. Apart from the smell of blood in the valley, it seemed as if the battle had never happened.

Chen Yunhao was suspended in the sky above the Cold Wind Valley stronghold, and only he could see him.

It was the same fifth-level demon from last time, holding a bead. A magic light came out of the bead, turning the flesh and blood of these monsters into drops of essence and blood, which were absorbed by the bead.

Except for bounty hunters and lone demons, demons will hardly leave any flesh and blood behind on a truly large-scale battlefield.

This phenomenon has existed since the beginning, so humans have already analyzed it and drawn conclusions.

The Blood Demon Venerable should be behind this demon invasion. Only he would care so much about essence and blood.

Taking advantage of the demons' retreat, Chen Yunhao quickly ordered the monks to clean up the battlefield and repair the damaged city walls.

The current situation on the battlefield is the same as here, basically in a stalemate.

Of course, there were also many strongholds and immortal cities that were caught off guard by the siege of monsters, and they lost a lot of monks and territories in a short period of time.

But then the human race will organize a large-scale counterattack and take back the lost territory.

In short, there can be no more mistakes in this line of defense.

There was peace for a month after the battle, but the human race's rear was continuously replenished with monks who came to defend the city.

There are now about 10,000 monks in the stronghold, which is a bit crowded for a small stronghold.

In addition to the additional manpower, a large amount of supplies were also delivered.

For example, various magical instruments, magic weapons, elixirs, talismans, and even thirty chariot crossbows for defending the city, which are truly low-grade magic weapons.

Each one is inlaid with three medium-grade spirit stones as the driving energy source.

This kind of chariot crossbow is different from those used by mortals and does not have actual long arrows.

Instead, it is a light arrow evolved from the formation engraved on the chariot crossbow. It is ten feet long and as thick as an adult's arm. Its range can reach a thousand feet and it can easily penetrate mountains and break rocks.

However, this thing consumes a lot of energy. Three medium-grade spirit stones can only fire six arrows.

With these chariot crossbows, the defense and offensive capabilities of the stronghold were greatly enhanced.

If it weren't for the fact that war would change many situations, this chariot crossbow would not have existed originally.

It was also because of this war that a weapon refiner got inspiration from the weapons used by mortals to defend the city, and thus created this magical-level chariot crossbow.

This is also a new invention, a powerful weapon that is very useful for defending the city.

Because Chen Yunhao's place was not the most intense part of the battle, the crossbow was delivered relatively late.

In other immortal cities, the power of this chariot crossbow has long been verified, and third-level demons can be killed with a single arrow.

Not to mention that the Tianyuan Realm and the Demon Realm are fighting in full swing, let’s just talk about the Shangyuan Palace in the Spirit Realm, which is considered the overlord of the Spirit Realm.

The person with the highest cultivation level in Shangyuan Palace in the spiritual world is Ye Qingyang, who is in the Mahayana stage. He is also considered a top figure in this vast land of the spiritual world.

Shangyuan Palace is an old sect in the spiritual world that has been passed down for more than 100,000 years. It has an orderly inheritance from top to bottom and has a strong following in the fairy world.

Hundreds of years ago, Shangyuan Palace sent an elite disciple to the lower world, Tianyuan Realm.

The main reason is that a message was received from the fairy world, which is strictly speaking also an order.

They were asked to search for an ancient mirror-like treasure in the lower realm. The specific appearance and other descriptions were not clear. It was only said that it was in the Tianyuan Realm, and the exact location was unknown.

Although there has been no feedback for hundreds of years, Ye Qingyang is not in a hurry at all.

For Mahayana cultivators like them, hundreds of years are just a blink of an eye.

However, he received news in the past few hundred years that more than one person went from the spiritual world to the Tianyuan world, and even two groups of demons went down.

The human and demon races have been fighting openly and secretly for many years. How could Ye Qingyang let the demon race take the initiative?

Just when he was preparing to make a backup plan, news came from the lower realm that the demon world had invaded the Tianyuan world on a large scale.

And according to feedback from disciples in the lower world, the invasion of the demon world should also be looking for some treasure.

Low-level demons only knew how to follow orders to attack cities and seize land, while demons above level five knew what the main mission of this invasion was.

Since the war between humans and demons broke out, there have been battles between the Divine Transformation cultivators and the fifth-level demons, and the human side even captured a fifth-level demon alive by setting up a trap.

On the human side, Qian Bolei personally performed the soul-searching technique.

But it was obvious that the demons were well prepared. Every fifth-level demon had a restriction placed on his mind, and once his soul was searched, his spirit would be shattered.

Therefore, the human race has not fully understood the specific purpose of the demon invasion. They only vaguely guess that it may not be as simple as occupying this world, but that they are probably looking for something.

What kind of thing was worthy of the Demon Realm's massive invasion? Ye Qingyang immediately associated it with the incident that happened hundreds of years ago.

Before, we had to guard against the demons getting there first, but now the most important thing is to guard against the demon world.

Because it is more difficult to travel from the spiritual world to the lower world, there is no way to send monks to the lower world on a large scale.

Therefore, the demon world has an absolute advantage over the spirit world in invading in order to find that treasure.

We must stop the demon world from getting that treasure first. This matter must be planned carefully.

Of course, the spiritual world and the demon world are similar. The two worlds belong to the same level, the spatial barriers are relatively weak, and it is easier to break through.

Therefore, the only way at present is to restrain the demon world's invasion of the lower world from the spiritual world.

So under Ye Qingyang's organization and coordination, more than a dozen forces in the spiritual world, including the demon clan, prepared to launch a counterattack against the demon world.

Of course, they had a legitimate reason, and their slogan was to stop the demon world from invading the human world, which was a subordinate of the spiritual world. In fact, the real purpose was only known by a dozen or so people.