"System, I chose to buy these four formations!" Chen Nuo didn't think much about it and directly purchased these four formations.

After all, he had already decided within these few days that as long as the upgrade points were enough, he would definitely buy the formation.

You know, the lethality of these formations is hundreds or thousands of times stronger than that of unmanned fighters!

"Ding, you spent 400 upgrade points to buy the White Tiger Killing Formation, Qinglong Killing Formation, Vermilion Bird Killing Formation, and Xuanwu Killing Formation!"

"Warm reminder, you can consume 500 upgrade points again to evolve the four arrays into the four-simile array!"

As the system prompt sound appeared, four discs and 16 small flags appeared out of thin air on the desktop in front of Chen Nuo.

The four discs are divided into green, white, red and blue.

They are in opposing formations.

The sixteen small flags correspond to a disc in the colors of each four poles.

This is some materials for the formation.

Now, as long as Chen Nuo inserts these small flags in a certain place, and then activates the disc with essence, blood and spiritual power, the formation will be opened.

However, what surprised Chen Nuo was the system's prompt sound that could merge the four formations into the Four Symbol Formation.

"In other words, if I buy these four formations and use five hundred upgrade points to upgrade them, I can evolve into the Four Symbol Formation?" Chen Nuo couldn't help but ponder.

The meaning is very simple. If you purchase these four formations and upgrade them, it will be one hundred points cheaper than buying the Four Symbol Formation directly.

This is very good.

"However, although the Four Symbol Formation is powerful, its range is definitely not larger than these four formations. If it is not necessary, there is no need to upgrade for the time being."

After murmuring for a moment, Chen Nuo began to browse the rules of using the formation.

The way to cast the formation is very simple. You need to insert the flag into the place you specify, and then drip the essence and blood of the caster into the core of the formation (that is, the disk) within the range of the flag, and then inject spiritual power to allow the formation to operate!

The method of use is very simple, but the only thing that makes Chen Nuo feel miserable is that the caster needs to use a disc to activate the formation within the formation.

In other words, if you want to arrange a formation, then Chen Nuo must go out!

This disrupted his idea of ​​using an unmanned reconnaissance aircraft to arrange formations.

This made him frown.

If I had known this, I should have learned how to use the formation earlier...

He couldn't help but sigh in his heart.

But, although he felt emotion, he thought about it again but didn't think about it any more.

After all, he was busy upgrading his shelter, scientific research base and practice before, so how could he want to get so much?

"It seems that I have to go out." While pondering, he began to make some preparations.

For example, how to attract those nuclear beasts.

After all, it is inevitable that he will not be able to go to a place with many cores and beasts when he goes out this time.

Therefore, after setting up the formation, he must also need to introduce things from the earth core beasts.

Although he had thought about tempting these earth-core beasts with living people before, as far as the current situation is concerned, can those earth-core beasts leave a living mouth for themselves?

So he began to browse the video playback of the previous drone and find a way.

Fortunately, after the video replay, he quickly found a way.

Because of last night's disaster, the government began to let speakers from all over the country broadcast recordings of survivors entering shelters in various cities.

It is precisely for this reason that Chen Nuo happened to find in the video that these nuclear beasts were angry because of the sound of the speakers and attacked the speakers.

And it was this discovery that gave Chen Nuo an idea.

However, while this idea appeared, Chen Nuo was also troubled instantly.

That is, because the destruction of the earth's core beasts has caused many lines to be destroyed. If a speaker is used, it will naturally be impossible to operate without power maintenance.

This made Chen Nuo frown.

"I don't know if the scientific research base can produce speakers that do not require electricity and can be played for a long time." While he pondered in his heart, he had already arrived at the scientific research base.

"Scientific research, with your current technology, can you create a speaker that does not require power maintenance and can still play recordings?"

Chen Nuo went straight to the point without any delay.

Soon, there was almost no stop, and a light curtain appeared on the center console, and then the sound of scientific research came:

"Yes, this solar horn can be made with only 0.1 kilogram of copper and 1 kilogram of iron! No link circuit is required to operate, as long as the sun is exposed to it, it can be used!"

Hearing this, Chen Nuo shot a glance at the speaker model on the screen.

This speaker is almost no different from an ordinary speaker, except that there is a small device for converting solar power to electricity on the host of the speaker.

Seeing this, Chen Nuo couldn't help but smile.

The materials are very small, and I just need them now, which is good.

After thinking about it, Chen Nuo immediately ordered:

"Make me four such horns... By the way, make me one more ammunition for the shell pistol and shell pistol!"

After saying that, as the robotic arm was operating, Chen Nuo couldn't help but ask: "How long does it take to complete what I need?"

"Two hours!" The scientific research answered quickly and accurately.

Chen Nuo nodded and then began to think about what he needed after he went out.

With guns and horns, there are basically preparations for everything except weapons and protective clothing.

"Scientific research, draw out the weapons and protective clothing you can make." Thinking of this, Chen Nuo spoke.

On the center console, the light curtain appeared again.

Nanolight Knife: The handle of the knife is iron, and the blade body is formed by nanoparticles. It is a hundred times stronger than an ordinary knife and is extremely sharp! It takes 5 kilograms of iron and ten energy crystals to make it!

Mechanical boxing gloves: A boxing glove that can greatly increase the power of the user's fist. Its attack power can even easily destroy a wall with a thickness of ten centimeters! It requires 50 kilograms of iron, five kilograms of copper, and ten energy crystals!

...

Battle Suit: It is suitable for combat, light and easy to use, and can greatly improve the user's sensitivity after wearing it! It takes 5 kilograms of silk and one energy crystal to make it!

Body armor: It can withstand a shotgun, and it requires 10 kilograms of silk and one kilogram of iron!

Mecha suit: made of steel and can easily withstand bullets of any gun. The only weakness is that it is bulkiness! It requires fifty kilograms of iron, one kilogram of copper, and one energy crystal!

...

Looking at these items, Chen Nuo finally chose to make a combat suit, a light knife and mechanical boxing gloves.

The combat uniform is to improve one's agility and use it for escape, while the light sword is to use it because of its own ability to control swordsmanship.
Chapter completed!