Finally, Emperor Shi Tian had prepared such a long line of defense, and it was time to come in handy.

In fact, the troops on the front line of the Heavenly God Academy can still support some time, but the price they paid is too great, and they really don't want to stay for a minute, so they retreat immediately after completing the task, and let the demon army drive straight into the defense line of Emperor Shitian.

At this time, the four main trump cards on the demon side had actually sensed that something was wrong, and obtained some information about Emperor Shi Tian through their own methods.

The million-mile-long defense line used hundreds of millions of personnel, and not only the people of Emperor Shitian, but also a large number of auxiliary troops supported by the Heavenly God Academy.

In short, there are so many people that there is almost no possibility of secrecy.

After so many years of fighting between the Celestial God Academy and the Demon Queen, both sides not only know the roots, but also invariably mixed sand with each other and infiltrated many spies.

Although these spies must not be of high grade, and they can't get into the core of the other party, there is still no problem in probing some peripheral information.

In short, before the arrival of the four trump cards, they already knew about this line of defense and Emperor Shitian.

However, as veteran lords who have fought for tens of thousands of years and have won more and lost less, they are certainly unlikely to look down on Emperor Shitian.

In their eyes, Emperor Shi Tian is just a fledgling little boy, and the so-called glorious achievements in the past are not worth mentioning at all.

Maybe the other party is a little clever, but it is obviously not enough to compete with the four high-level demon lords in terms of hard power.

Especially after learning about Emperor Shitian's defensive line, the four high-level demon lords were even more disdainful.

What's the use of building a high city wall? What's the use of having a lot of alchemy weapons? In the face of the endless demon army, this thin line of defense is simply vulnerable.

It was with such a proud idea that the four high-level demon lords didn't even make a tentative move in advance, so they directly waved their troops aggressively, and the demon wave like a tsunami approached the first line of defense of the Emperor Shitian.

I have to say that the four high-level demon lords do have the capital to be proud of.

The number of troops they have in their hands now is basically beyond their count, anyway, it covers the entire No. 0 theater, and it stretches for tens of thousands of kilometers.

From above, the entire land is occupied by demons, and God knows how many there are.

And the most important thing is that these demons in front of them are only the headquarters of the four high-level demon lords accumulated all the way, and they do not include their follow-up troops.

In fact, in many places where the demon army is located, there are temporary altars that are erected and then opened directly.

Under the flickering evil aura of the Demon Altar, teams of demons came out of the Demon Summoning Altar.

Almost every pair of demons numbered in the thousands, and the same black pressed a large area.

It's just that their quality is uneven, most of them are black iron level cannon fodder such as small inferior demons or small devils, and there are less than three high-level soldiers at the bronze level, and as for the high-level troops above silver, it is between half and one percent.

In contrast, the headquarters of the four high-level demon lords are much longer, and most of them are basically bronze-level troops, and high-level troops above silver can account for more than thirty percent.

The reason why this is the case is entirely because the four high-level demon lords have fought too many victories along the way.

Every time they defeat the defending forces of the Celestial Academy, they, as the victorious side, can have the power to clean up the battlefield.

At that time, whether it is the demons killed in battle or the corpses left behind by the Heavenly God Academy, they will all be eaten by the headquarters of the four high-level demon lords, including the corpses of some high-level soldiers.

After eating these high-level corpses that contain energy, the demons can easily evolve and ascend.

Anyway, every time a battle is won, there will be a large number of high-level troops above the silver level in the hands of the four high-level demon lords.

Over time, the quality of the troops of the four high-level demon lords has become very high, and the number is also terrifying.

Facing the demon army like a tide, as well as the number of high-level troops in it that could not be counted, even the high-level of the Heavenly God Academy had a bit of a headache, let alone facing them directly with the Emperor Shitian.

Although he had been prepared for this bad situation for a long time, after really meeting the other party, Emperor Shi Tian's heart couldn't help beating the drum.

But fortunately, Emperor Shi Tian's psychological quality is very good, after all, he has been an emperor for 100,000 years, and he has dealt with many disadvantages, so now he can also be calm, and he can also use some ridicule and ridicule to calm the emotions of his subordinates.

Seeing that Emperor Shi Tian was so calm, many of his generals gradually calmed down and prepared to fight this battle wholeheartedly.

Finally, the vanguard of the four high-level demon lords entered the range of the super giant cannon, that is, a range of 300 kilometers.

There is no need for Emperor Shi Tian to talk nonsense at all, and the front-line commander can directly order according to the specific situation.

After all, it is a million-kilometer defense line, and the speed at which the demon army arrives is also uneven, so it is obvious that Emperor Shi Tian cannot give an order at this time.

Among them, the first to fire the cannon was the leftmost troops, and they faced the army of the lava lord Tagner.

One of the disgusting characteristics of the forces of the Lava Lord Tagner is that they must use lava to clear the way before marching.

Not only does the terrifying hot lava directly kill enemies, but it also provides a massive support to the Molten Lord Tagner's fire-type army, increasing its combat effectiveness by at least three times.

Under this almost reipi-like tactic, the lava lord Tagner is also one of the stronger of the four high-level demon lords, and he always rushes to the forefront of the siege and land along the way.

And this time is no exception, the legion of the lava lord Tagner may not have arrived yet, but the magma frenzy set off by his troops has already rushed over, like a magma tsunami more than ten meters high.

Where the terrible lava passed, the green meadows turned to ashes in an instant, and the occasional large tree that grew on the meadow quickly turned into a giant torch.

As for some of the primitive creatures above, whether they were neutral beasts, or demonized, the evil beings on the demon side were all killed by magma.

In the eyes of the devil, there is no mercy at all, even if it is a unit of the same camp, as long as it is not pleasing to the eye, it will definitely be killed by the way.

In this case, Emperor Shi Tian definitely couldn't let the magma get closer.

Therefore, Emperor Shitian's super cannon immediately began to roar in advance, accompanied by an earth-shattering cannon sound.

The 20-ton cannonball shot out of the muzzle, and the rear was accompanied by a massive amount of blue arcane elements, forming a shockwave similar to flames, which propel the cannonball forward and disperse in both directions.

After the shell disappeared, within a range of several hundred meters in front of the muzzle, a terrifying storm was set off in an instant, and a layer of ground was lifted away, which showed the terrifying power of this cannon.

With a series of cannon shots, countless small black dots rose into the air and flew straight for 300 kilometers away.

For such a long distance, even at the speed of a cannonball, it would take several minutes to fly.

And the controllers of the super cannon obviously won't wait so long, and after they fired the cannon, they immediately began to control the cannon and prepare for the next shot.

The first is the junior magician who is in charge of operating the cannon, and casts a magic mark on the tail of the cannon.

Then the rear of the alchemy cannon opened automatically, revealing the huge cannon muzzle behind it in the blue and white mist.

At the same time, a giant with a height of more than 10 meters, naked and holding a huge cannonball in both hands, walked over in a few steps and quickly filled the cannonball into the muzzle.

When the giant was finished, it immediately retreated, while the other giant shoved a few meters of medicine rolls behind the shells.

It was filled with alchemy propellants, which weighed more than a dozen tons, and it was by relying on the terrifying impact of their detonation that they could send 20 tons of shells 300 kilometers away.

The two giants will leave when they are filled, and one of the other giants will quickly close the cannon door that was opened.

Once all the giants had completed the steps, they would squat down as fast as they could, with their backs to the cannon and their hands tightly over their ears.

The magician examined it carefully, and then made a different kind of magic mark again.

After this magic mark fell on the barrel, it immediately triggered a series of reactions, and a series of magical brilliance kept rising on the barrel, first strengthening the barrel, and at the same time cooling down, and immediately detonating the alchemy package inside after completion.

The next moment, there was another earth-shattering bang.

The entire cannon was pushed back by the recoil, and then slowly returned to its original position under the effect of the alchemy spell.

The front of the muzzle was once again ravaged by the shock wave, and the original grass was long gone, leaving only a layer of earthy yellow ground that had been torn off, and even the steam that had been evaporated by the high temperature.

Even after two shells in a row, the first shell did not hit the ground.

So, the same process started again, the giant quickly reloaded, the magician quickly fired, and a large wave of 20-ton cannonballs rose into the air.

It wasn't until the eighth shell was fired that the first hit the ground with a bang.

After the 20-ton cannon shell fell on the magma, it immediately detonated a pure white mushroom cloud, and the terrifying huge shock wave instantly blew all the magma within 50 meters to pieces, and even the earth blew out a crater.

As for the surrounding magma, it was also swept around by the shock wave, and if there were fire elements or magma creatures in it, hehe, it would basically end up shattered.

However, this is not the most terrifying, the most terrifying thing is that these cannonballs turned out to be attribute cannonballs, and all of them were attached to the surface of a lowest-level magic array of ice breath.