In the blink of an eye, 6 months have arrived, and Emperor Shi Tian, according to the agreement, should start to fight on the front line of the zero theater.

But in fact, Emperor Shi Tian used his special authority to send a large number of troops to the No. 0 war zone four or five months ago.

But these units did not go directly to the battle, but began to build defensive structures in the rear of the battle line.

At the same time, Emperor Shi Tian also asked the head of the Angel Branch that he must buy enough time for this army.

For this reason, the head of the Angel Branch had to station heavy troops on the front line of the zero war zone, and paid an extremely heavy price to barely delay the attack of the four demon high lords, and won several precious months of precious time for Emperor Shitian's troops.

If someone else dared to make such a request, I am afraid that the head of the Angel Branch would have exploded a long time ago, for the sake of these few months, the official troops of the Heavenly God Academy have paid hundreds of millions of combat troops, and even several sage-level masters have died.

However, after seeing the situation on Emperor Shitian's side, the dean of the angel branch gritted his teeth and insisted on it, and under the huge pressure from all sides, he was stunned to complete Emperor Shitian's request.

And the reason why Emperor Shi Tian was able to win the trust of the Angel Branch Dean was because his actions were extremely vast, and at first glance, he gave people a feeling of trustworthiness.

For this operation, Emperor Shi Tian also let go, and basically sent all the earth cultivators in his hands.

After so many years of cultivation, Emperor Shi Tian has millions of earth cultivators, and all of them have earth spirit beads.

After they arrived in the zero war zone, they immediately began to build defenses in accordance with Emperor Shitian's orders and plans.

First of all, there was a huge city wall several hundred meters high, which cut off the entire Zero War Zone with a length of one million kilometers!

If it weren't for the help of many earth monks and earth mages, this wall alone would have taken me an unknown number of years to build.

But now, under Emperor Shakti's strong orders, all the earth-based monks have played with their lives, squeezing out the last trace of their magic power, and then they have to keep replenishing it by taking magic potions.

In the end, it took more than ten days to build this magnificent city wall.

And while these earth monks were building the city wall, tens of millions of dwarven warriors were also dispatched at the same time, and their task was to spread all kinds of simple mines along the city wall, spreading them hundreds of kilometers away.

In other words, this minefield is hundreds of kilometers deep, and it can definitely make the invading demon army drink a good pot.

And this is only the first line of defense, after the construction is completed, everyone immediately moves back 100 kilometers and then continues to build the second line of defense.

At the same time, the first line of defense has also begun to be officially armed.

This time for the defense of the city wall, Emperor Shi Tian and his staff were also racking their brains.

Naturally, there are a large number of long-range weapons at the top of the city wall, and all kinds of long-range alchemy cannon fire are available, and they are very dense.

But these are actually not the most important things, they are really true, let Emperor Shi Tian use them as the mainstay killer weapon, or the large number of super giant cannons arranged more than ten kilometers behind the wall.

The so-called super cannon is a new weapon specially developed by Emperor Shi Tian for this war, with a length of 60 meters and a caliber of 1200!

That's right, the caliber of 1200 mm is really a bit of a madness for a cannon that fires physical shells.

And such a caliber was not worked out casually, but on the basis of shells.

This time, Emperor Shi Tian simply no longer asked ordinary people to load cannonballs, but set his sights on the giant troops that he had cultivated for many years.

Ordinary giants, with a flick of their arms, can have a maximum strength of 100 tons, but obviously they can't be forced to exert their full strength every time, in that case, they will fall into a state of exhaustion very quickly.

So according to the calculation of the strength of ordinary giants, 20 tons is a very suitable weight, which can allow giants to reload continuously, and after blessing some spells that increase stamina, they should be able to work continuously for more than half an hour.

So, Emperor Shi Tian designed a new alchemy cannonball according to the standard of 20 tons.

There is no need for shells, if it is just a warhead, 20 tons will be almost 1200 in diameter, this is the origin of the caliber of the super giant cannon!

In the end, Emperor Shi asked the Super Cannon to have as long a range as possible, at least 200 kilometers away.

The range of the cannon is related to the length, and in the end, Emperor Shi Tian determined the limit of 60 meters, which can allow the super cannon to have a terrifying range of up to 300 kilometers.

Of course, the super cannon is a mass-produced, low-priced, low-tech temporary weapon, so after having a caliber and range, there is no way to guarantee accuracy or anything.

According to the test of Emperor Shi Tiandi, the error deflection of the super cannon can reach more than 2 kilometers at the longest range.

This means that hitting a target of 4 kilometers can be achieved with 100 shots, but if the target is not so big, it can only depend on luck.

But fortunately, the super cannon has a large caliber and a large ammunition load, so the explosion power and range are also very terrifying.

After calculation, the cannonballs of the super giant cannon can hold up to 12 tons of alchemy gunpowder, and after they are activated by the primary magic array, the terrifying power that erupts is enough to instantly kill most of the golden troops within a range of 50 meters.

Most of the silver varieties can be killed in seconds within 200 meters, bronze can be killed within 500 meters, and even black iron troops within 800 to 1000 meters can basically be killed or injured.

With such a terrifying explosion range, accuracy or anything is not so important.

The most important thing is that the super cannon will have a huge number and a decent firing speed, and when the time comes, it will form a terrifying barrage that will directly drown any demon army that dares to offend the defense line.

However, if you want to make a large number of super cannons, then you must not be able to use good materials.

In fact, most of the volume of the super cannon is nothing more than bronze-level metal, only the inner wall of the barrel is silver-level, and at the same time, a gold-level metal magic array is attached.

This greatly reduces the cost of the Super Cannon, and also reduces the difficulty and time to manufacture.

In particular, a large number of Centaur Ji, with the Gate of Truth and metal manipulation, can quickly and quickly manufacture the inner wall of the cannon barrel, saving a lot of time and cost for Emperor Shitian.

As for the other parts, the ordinary alchemy factory in the hands of Emperor Shi Tian could be completed.

At this time, I saw that the benefits of Emperor Shitian's large industrial system were coming, and what he wanted to do could be quickly manufactured in large quantities.

This is true not only of the Super Cannon, but also of the cannonballs.

In order to make a large number of shells as quickly and cheaply as possible, the shells of the Super Cannon are also designed to be extremely cheap.

Not even much magic metal was used, the main body was ordinary steel, but the outer magic array was made of bronze-grade magic metal.

The most valuable part of these cannonballs is the alchemy powder inside, but the main body of this thing is arcane dust, a magical material simply refined from magic water.

With the amount of magic water in Emperor Shakti's hand, it was simply too easy to create arcane dust.

In this case, after the successful development of the super cannon, Emperor Shi Tian immediately made countless cannons and shells with just one order.

In particular, the manufacture of artillery shells is extremely simple and fast.

Danmaku stopped all of her missile-making production lines and switched to producing these low-level shells, with thousands of rounds ejecting almost every moment.

And this kind of shell, both in size and technical content, is far inferior to missiles, so the production speed is faster than missiles, I don't know how many times.

All in all, in just a few days, a huge number of shells almost filled the empty warehouse.

So much so that later shells had to be stacked in the open.

Fortunately, Emperor Shitian's Jiangshan Sheji space is large enough, and it doesn't rain, so it can be installed, otherwise it would be really a trouble.

And when arranging defenses, Emperor Shitian's terrifying industrial production capacity dared to show his murderous side.

Behind the 1 million-kilometer-long defensive line, a super-giant cannon is deployed every few hundred meters.

Not only that, but each megacannon is equipped with a full 10,000 shells.

The 20-ton shells were several meters high, and the giants had to hold them in both hands to move.

10,000 rounds of cannonballs were placed vertically, forming a forest of steel.

And such steel forests, there are one every few hundred meters, and they stretch for millions of kilometers, God knows what a terrifying number.

But this is only the beginning, because with only one line of defense, it is impossible to resist the attack of the four high-ranking lords no matter what.

Therefore, Emperor Shi Tian just hoped that this line of defense could consume some more troops of the other party.

And take advantage of the opponent's terrible casualties to greatly reduce the opponent's attack speed.

For this reason, Emperor Shi Tian did not hesitate to build a second, third, and fourth defense line behind this line of defense, so that the first dozen or twenty lines of defense were built.

In fact, Emperor Shi Tian himself didn't know when it was a head, he just gave an order that a defense line must be completed every 15 days, and after the repair, he would continue to repair 100 kilometers behind, not knowing when to call a stop.

And just after the defense line is built, the super cannon and the matching shells will also arrive as soon as possible, anyway, this thing really needs as many as possible.

Seeing this situation, Emperor Shi Tian's plan was almost partially exposed at this time, which was to use this line of defense to constantly delay the attack of the Demon Legion.

Spend a lot of shells in exchange for the opponent's living power, and make it impossible for them to advance quickly.

Moreover, the defense line in front can be lost, but the super giant cannon behind the defense line cannot be discarded at will, after all, such a big guy is not easy to make, and it is also very expensive.

At that time, it is completely possible to retreat while the army of the city wall is resisting, as long as the super giant cannon is preserved, Emperor Shi Tian will be sure to win this battle.