In order to be able to design the most practical weapons and equipment for himself, Zhang Fan has also conducted many tests by using the illusion drill function of the shield in the universe. And his own thoughts and rationality are also difficult for many indigenous protagonists in this fantasy plane to have.

With his current strength and quality, he is actually considered weak among the masters of the Transformation Realm, probably only about 1,100 times the limit of ordinary people. If we compare it with the ordinary well-trained soldiers who do not take strength as the main training direction in modern times, it is about three or four thousand times the degree.

Therefore, in the case of the limit, it is very sensitive and flexible, and the ability to fully and accurately use a single weapon with a total of about 18 tons is to a large extent an upper limit, and in order to make the mental power of the arm like a finger give full play, and stably point to a very accurate direction at the fastest speed, it cannot be used like a rifle, it must be a shoulder-mounted use method.

Zhang Fan first tested the way that seemed to simulate the seven-pack 35mm cannon type weapon to fight against a foundation building master conjured up in the illusion of the Qiankun Shield. Zhang Fan originally thought that even the firepower of an ordinary missile boat at the level of an air defense weapon could not deal with the masters in the early stage of foundation building, but under his mana, which was more sensitive and accurate than the dense array, the strength he exerted should be far the same.

In this way, when a simulated "giant liquid robot" like a "steel man" who was good at melee combat and had a height of two feet appeared a few miles away, Zhang Fan controlled the huge seven-mounted 35mm cannon with mana to launch a precise and rapid attack, and the entire artillery system seemed to be suspended in the air out of thin air, and when firing, it would only vibrate backwards and not shake left and right at all, as if each barrel was fixed by an invisible force. Almost at the same time, the flexibility of control was almost more accurate than when the top-of-the-line small arms remote control station operated the miniature submachine gun, and with Zhang Fan's mental power at this time, when the target was shaking, the range of positions that countless targets might exist in the future was also shown based on momentum estimates. The entire multi-mounted cannon is almost more advanced than the most advanced Spitfire cross-linking fighter system, and the automatic adjustment of the hotline is launched. It seems that even if the opponent is an incoming hypersonic missile, it can rely on this kind of multi-link gun to intercept it.

However, at that height of two zhang, I don't know that the self-protection ability of the refining system foundation building master, which is dozens of times stronger than the T800 or even T1000 in "Terminator", still exceeds Zhang Fan's imagination. Although the foundation building master of the refining system is as tall as a giant, it seems that he is far more sensitive than he imagined, if it weren't for his spiritual power and transformation level ability, he could still rely on internal force to adjust the direction of the cannonball at a close range of about a mile, it seems that he would not be able to hit the opponent at all in the common effective range. The opponent was always able to dodge the seemingly inevitable rain of bullets like lightning, and approached him in a short period of time.

When the distance between the two sides approached within one mile, Zhang Fan took advantage of the vibration of the continuous fire of the multi-cannon to retreat desperately, approaching the speed of sound almost in a short time, which allowed hundreds of machine gun shells to hit the opponent. However, these shells could not break through the golden light of the opponent's body protection at all, and only set off ripples on the surface of the opponent's body outside. Obviously: the master of refining the body that has entered the foundation building period seems to be more powerful than the T1000 that is enlarged to a height of two zhang, in addition to its own body protection and even the very possibility of strong healing ability, the body surface also has a stronger body protection cover than the ordinary qi wall.

"Stop! Forget it!" Zhang Fan could only choose to finally admit defeat before he was defeated. At the same time, with a more intelligent mind than ordinary people at this time, he quickly realized something: it seems that the battle between fantasy masters is very different from what he imagined before. The pace is actually much faster than the storytelling and romance descriptions of most fantasy novels. It is also different from gunfights and artillery battles between mortals.

Because both sides have the ability to hit and even the "fire control ability" that ordinary soldiers and kings cannot compare with at all, the demand for ammunition and rate of fire is not large. It's like the confrontation between two snipers with a sniper rifle with a shield, whether they can break the defense and how powerful is the most important, in addition, who enters the opponent first can ensure the effective range of the hit...

Subsequently, the seven 35 mm cannons in the illusion were transformed into a 406 mm cannon with a projectile weight of about the same size every half minute. Theoretically, the strength of the barrel is slightly better than that of World War II artillery, the rate of fire can reach three rounds per minute, and the muzzle velocity reaches the level of one kilometer per second, which can fire shells of the weight of a car.

In actual combat, Zhang Fan of course also understands that this kind of cannon may only have one chance to fire when facing a master with similar strength or even slightly stronger body refining than himself...

The target appeared a few miles away again, and this time when the other party approached about half a mile away from him, Zhang Fan controlled the giant cannon of more than ten tons to launch an accurate and fast low blow.

However, the body refining master's dodge ability was still too strong, avoiding a distance of at least a quarter of a second, and even if he tried to control the tail of the cannonball with the internal qi, so that it could only get close to the nearest person or so as to attack the opponent like a precision-guided cannonball. As for the explosion of air, there doesn't seem to be any threat other than a few moments of ejection from the other party...

In this way, in the continuous trials and tests, Zhang Fan also began to find some methods. For example, if in the face of a strong enemy, it is often a move that determines the victory or defeat, then it is completely possible to maximize the life of the body. In addition, the "soil powder metallurgy" and "soil method oxygen blowing furnace" brought by their own domestic forces have enabled the top refiners on the Xihai Continent, which is a low-level martial arts river, to mass-produce steel twice as strong as modern top steel, so that the kinetic energy of the body tube can be completely "overdrawn" at a rate of 100,000 joules per kilogram, several times the standard method of conventional weapons. It doesn't matter if you can only fight once or two or three times. Since it's a one-shot deal, the simpler the weapon, the better. It doesn't matter if the cannon looks like an ancient artillery, only if you don't need too many mechanical devices to maximize your power with a limited upper limit of weight control...

In this way, a set of weapons designed through the test and verification of the shield began to enter the manufacturing and implementation stage. In order to save time to the greatest extent, Zhang Fan's forging and even processing work were temporarily put into the Qiankun shield, and it took about half a year in the shield to create a total of 20 pieces of "ancient steel cannons" without fire doors weighing about one ton each with his current cultivation, because with Zhang Fan's transformation skills, it can be used effectively and flexibly through the cannon body.

The gun is six meters long and about six to four inches in diameter, and the thickness varies depending on the pressure demand. The caliber is only about 70 millimeters, the armor-piercing body is seven centimeters thick, about half a zhang long, and weighs 30 kilograms. In the illusion drill in the Qiankun shield and even the actual test using two of the cannons, Zhang Fan used "gas cannon" and "air cannon" as the basic principle when he could not find the raw materials of modern explosives. Mixing carbon gas and oxygen, he used all his current strength to press the stainless steel "armor-piercing body" like the core of the shell-piercing bullet into the barrel of the gun. The pressure seems to be higher than the maximum chamber pressure of ordinary artillery to some extent, and a part of the armor-piercing body under the armor-piercing body is skillfully welded with the bottom of the gun. When it is intended to be fired, as long as the mixture of oxygen and carbon gas that has been compressed into a liquid state is effectively transmitted by ultrasonic vibration, the entire chamber will also fire the shell out the moment it expands.

According to Zhang Fan's rough estimate, the muzzle energy is about several times that of modern mainstream tank gun armor-piercing shells, about 100 million joules, which can launch an armor-piercing body weighing about 50 kilograms at a speed of about two kilometers per second and about six times the speed of multisonic speed.

Under their precise control, the eighteen guns can simultaneously fire a total of about 900 kilograms of shells at a speed of six or seven times the speed of sound, and at a certain distance, they can also fine-tune their tails by means of transformation to accurately track attacks within a certain range. After having such an ability, Zhang Fan in the illusion practice was able to win and lose against the masters in the early stage of foundation building in the refining direction for the first time. In particular, Zhang Fan further made some improvements to the armor-piercing body, so that after the armor-piercing body hits the target, there is a certain probability that the internal flammable mixture will be detonated by pressure, bringing greater after-effects.

This set of eighteen stainless steel weapons was temporarily called the "Shenwu Artillery Array" by Zhang Fan