The giant rhinoceros and the apparently intelligent little creature clearly had a lot of secrets hidden in them, but now there was no chance to watch them unleash their natural abilities. The carcass of the giant rhinoceros was still there, and the little creature was not even a slag.

According to the characteristics of the little creature, Lin Xi and Chu Jungui named it the messenger. Looking at its size, it doesn't look like it's behind it.

Now that the messenger's whereabouts have been discovered, Chu Jungui knows that difficulty four will appear soon. The fourth difficulty scenario will have air units, although it is only a close-range attack, and there will be no air combat ranged units, but the appearance of air units will leave the ground defenses completely empty.

Lin Xi once had some questions about the difficulty division of Chu Jungui, for example, why didn't the long-range air combat troops in difficulty five appear in advance?

Chu Jungui's answer was that most of the beasts here had evolved naturally, and there were only faint traces of human adjustment, and it was even difficult to determine whether it had been adjusted by human factors.

Among naturally evolved organisms, the ability to fly itself is overwhelmingly advantageous, and there is generally no need to evolve long-range abilities. Even for ordinary people in the 35th century, hitting a moving target in the air is still a very difficult task, and it must be assisted by a chip, or even an automatic aiming system.

Such creatures have probably been eliminated in nature long ago.

As for the difficulty five, Chu Jungui has already prepared, the optimization of the biomass rifle in the chip has been carried out for 9 hours, and it will be completed in less than an hour. At this moment, the prototype of the new rifle can already be faintly seen. After Chu Jungui made the final adjustments to the plan, he waited for the design optimization to be completed, and continued to build fortifications on the roof of the cockpit.

He built a reinforced position on top of the cockpit. The position was supported by alloy instead of wood, with scrap bricks as the central armor layer, and two layers of mortar and one layer of bone chips painted on the inside and outside. With such a defense, the spinyback beast at least 100 meters away could not do anything. At the same time, Chu Jun also installed a bracket, which has a simple hydraulic retreat and re-entry device, which can allow Lin Xi to automatically return to his original position after shooting, so that he will not be overturned by recoil.

As for Lin Xi, she continued to do what she liked: burying mines.

By the time Chu Jungui had completed the fortifications, the design of the new biomass rifle had also been completed. Like the sniper rifle, this Planet Four version of the rifle has also been changed beyond recognition, at first glance it looks like an insect covered in heavy carapace, with a somewhat eerie curve, and the blue-purple hue of the whole body adds to the sense of mystery.

The body of the new rifle is nearly 1.5 meters, which is too large to resemble a rifle, and the most striking thing is the feed magazine with a square box below. After Chu Jungui adjusted the design, what came out was no longer an assault rifle, but a real machine gun!

This Exotic version of the machine gun has a muzzle velocity of 1200 meters and a rate of fire of 600 rounds per minute. Although the rate of fire is not outstanding, it is quite impressive for a weapon made of biomass materials, after all, the rate of fire of weapons made of biological materials is naturally insufficient.

And this rate of fire is close to Chu Jungui's limit play. Under full speed shooting, Chu Jungui was able to aim each bullet at a different target at a certain angle, and the machine gun had the effect of hitting a precise rifle.

This is Chu Jungui's confidence in dealing with air forces. As long as the beasts dare to come, Chu Jungui will let them know what anti-aircraft firepower is.

The new Exotic Machine Gun can use normal rifle bullets, albeit with limited power. It also has specially optimized design bullets. Specialized machine gun bullets are half as large as rifle rounds, and the charge and power are correspondingly increased, but the rate of fire is somewhat lower, about 450 rounds per minute.

The slightly lower rate of fire isn't too much of an issue, so it's much more powerful, and two bullets can kill a beast with two bullets. Three bursts can destroy the Thornback. However, specially designed bullets cannot be directly made from existing raw materials, and must be processed by the editor before they can be used.

Chu Jungui took stock of the ammunition reserves in his hand. The latest wave of attacks was wiped out by fission bombs, so nearly half of the materials were lost, and in the end, only the equivalent of 80 alien beasts and nearly 200 thorns were harvested. All of these materials were used by Chu Jun to make bullets, and about 2,000 rounds of ammunition and 100 sniper bullets were eventually harvested. Counting the remaining stocks on hand, the two men had about 2,500 rounds of ammunition and 150 sniper rounds in their hands.

These ammunition reserves are completely capable of launching a medium-sized military operation, after all, Chu Jungui has a machine gun in his hand, and the damage he inflicts alone is equivalent to the accurate shooter of a platoon. Lin Xi is not so exaggerated, but when it comes to real strength, he is comparable to the elite fighters of a class.

Chu Jungui also built an alien version of the machine gun for Lin Xi to provide continuous firepower. At this time, Lin Xi had already gone back and forth several times, and he didn't care about Chu Jungui, so as soon as he came back, he stuck in front of the workbench and buried himself in making some strange little things.

Chu Jungui casually asked how many mines she had laid, and then got a shocking number: 19 species, a total of 210.

After seeing the most basic stabbing thunder and chain cutting thunder, Chu Jungui suddenly felt that these alien beasts were a little sad.

At this time, Lin Xi's chip was still developing the alien version of the organic matter separator, while Chu Jungui continued to build five polymeric battery packs, and after adding 100kW of energy supply, he began to produce the original version of the organic matter editor.

The Organic Editor can re-edit raw materials to form specific molecular structures to achieve specific properties, whether physical, such as super-hard, hyper-ductile, or high-temperature resistant, chemical, or chemical-physical common.

Among the materials in Chu Jungui's current hands, including mortar, animal bones, and thorns, they can all be re-edited to enhance their performance. Raw material editing also needs design drawings, and when Chu Jungui's chip was designing the alien version of the sniper rifle and machine gun, he analyzed some materials by the way and gave a plan for editing improvement.

Chu Jungui entered the design drawing of the editor into the workbench, and the total manufacturing time was about one hour, and the final power consumption was 40kw.

"The energy is enough. Chu Jungui thought about it, and was about to press the button to start manufacturing, when he suddenly remembered something and looked at Lin Xi, who was busy not far away.

With a sigh, he canceled the editor's manufacturing process and instead made an add-on to the furnace: the Electrolysis Module.

There are two expansion ports for the base furnace to install enhancement modules, corresponding to more than 20 different functional modules.

The electrolysis module consumes about 50 kW of energy, which is equivalent to a quarter of a refining furnace and about the size of a dishwasher in the home planet. Chu Jungui installed the electrolysis module on the expansion port reserved for the refining furnace.

There is no oxygen on Planet Four, and there is no water on the surface, but there is a lot of oxide. These oxides can be electrolyzed in the refining furnace to release oxygen.

With oxygen, there is also water, and the two of them no longer need to live a life of extreme survival.