The more Lin thought about it, the more he felt that he could.

Even if the bazooka can't be mass-produced for a while, he can still match the MP5 submachine gun to the robot dogs.

The power supply problem that plagues the robot dog is actually very easy to solve.

Produce more robot dogs that can be charged with solar panels, and then fully charge them, even if the lizardman comes all night, you don't have to be afraid at all!

Lin Yue walked quickly to the shelter, opened the alloy door, and returned to the safe and comfortable shelter with his companions.

Turning on the electric light, Lin Yue bathed in a warm light and walked into the shelter.

After the tension of the battle just now faded, a deep sense of exhaustion gradually came.

Still, he didn't want to just go straight to sleep.

The work to be done has not yet been done, especially the fact that a lot of saltpeter has been collected this time, which has stimulated his nerves and curiosity, and made him want to get out of black powder, which can be said to be the most important thing nowadays.

Think about it, if you combine black powder with crossbow arrows or something, what will happen?

Exploding Arrows!

A weapon more terrifying than incendiary arrows!

If equipped on a ballista......

Even if a giant creature comes, it can take an unimaginable amount of damage from a simple attack of an explosive ballista arrow!

Until then, though, what he needed was a safe and sturdy environment.

If he accidentally caused an explosion, he wouldn't hurt himself and his shelter because of it.

Xiaobai and Xiaomeng led the Xiaoice lizard to the bathroom and cleaned the blood and sweat of the lizardman on their bodies, and Lin Yue also took off the light-out night suit and immediately ran to rinse it.

I have to say, the taste is too hard to top.

After cleaning and giving Xiaobai something to eat, Lin Yue also took a piece of lion-headed bear's meat steak in his mouth, went down to the basement, and walked to the location of one of the emergency passages.

Halfway through the passage, he pushed open a metal door that hadn't been opened in a long time and entered.

Turning on the lights, Lin Yue looked at the room made of alloys, and took out a high-precision research workbench and put it in front of him.

Alloy Vault, by far the safest and strongest of all his shelters.

At least when he is hiding here, it is estimated that except for thunderstorms, no other disaster can break through this place, and it will have no impact on him.

It is arguably extremely sturdy, and is the most suitable refuge for the last humans in this otherworld.

Eighty square meters is also spacious.

Lin Yue ajar the door, and the position he was standing in now would be able to rush out of the door of the shelter as quickly as possible if something happened to him.

Took out 1 unit of natural sulfur ore and placed it on the crafting table, which disintegrated it into sulfur ore and other things.

It's pretty convenient.

Lin Yue took out a piece of paper and put the sulfur ore on it, and the other impurities were stored in the storage space

He spent another 300 points in the Survival Point Mall for 3 units of charcoal, which he also put on the paper, and got the sulfur ore.

"I remember, it seems that the ratio is talking about 2 units of saltpeter?" Lin Yue recalled the knowledge he had read on the Internet before, and after placing 2 units of saltpeter on it, suddenly the system made a sound.

[You have obtained the blueprint of black powder!] 】

Good guys, how did it go so well this time.

Lin Yue had even touched the alloy door with his hand, and half of his foot had stepped out.

To tell the truth, in terms of explosions and gunpowder, he really only knows the so-called 1 sulfur, 2 nitrate and 3 charcoal, and the rest is to go to the street when he was a child to pick up the ones left over from people's weddings and artillery battles, and then pour out the gunpowder inside, and finally light it with matches.

However, it is also worth celebrating the success of getting black powder out.

"Black powder...... How powerful is this thing? Lin Yue immediately started to make it, and after preparing the materials needed for the design drawing, the white light flashed, and the output of five units of black powder also successfully appeared in front of him.

According to the requirements of the design drawing, there is also a piece of paper, and this paper is also the outer packaging that wraps the black powder.

Lin Yue picked up one of the packets and immediately identified it.

[Primary black powder: After ignition, it can be burned violently, and at the same time, the volume will expand sharply, the pressure will increase violently, and the large amount of heat released by the reaction will further raise the temperature to more than 1000 degrees Celsius, so that the gas expands, and a strong thrust is produced and an explosion occurs. In the event of an explosion, the particles of the solid product are dispersed in the gas, producing a large amount of smoke. 】

The power doesn't seem to be great.

After all, this thing is honestly used for fireworks and the like, and if you want to increase its power, you have to add some additional materials.

The material must be injurious.

For example......

Lin Yue took out a piece of steel and put it on a unit of black powder, but there was no response.

The experiment was put on three units of black powder again, and the system's judgment came.

[Upgrade black powder to steel ball explosives, requires universal upgrade design plan X1]

Really.

Although I don't know if there is such a so-called steel ball explosive in reality, since the system has determined that it can, then there is no problem.

I looked at the remaining universal upgrade blueprints, and they were out of stock.

By the way, he hung twenty bottles of wine on the World Trading Channel, and chose to receive a wave directly, the more the merrier.

You have obtained the Ball Explosives! 】

The volume of the black powder in front of him had become slightly twice as large.

Lin Yue didn't stop.

[You dismantle the steel ball explosives and obtain the design of the steel ball explosives!] 】

This time, you can.

[Steel Ball Explosives: Black Powder X3, Steel X1]

Putting away the remaining black powder on the table, Lin Yue immediately chose to make it!

【You have obtained Ball Explosives X2】

Something exactly like the one just before appeared.

[Steel Ball Explosives: After a sufficient amount of black powder explodes, the steel balls in the explosives will be ejected to cause great damage, with a killing radius of three meters!] 】

Lin Yue looked at the inspiring text under the system's identification, and couldn't help but nod slightly.

What would be the effect of this thing if it was shot with a ballista arrow?

At least when facing the impact of a group of lizardmen legions, it is estimated that it will cause great damage and have a great shock to them!

With no way to obtain or make TNT or C4, this thing should be the most powerful weapon he has at his disposal.

Lin Yue's heart was full of excitement!

He took out the ballista and placed it in front of him, then placed a ball of explosives on top of the ballista arrow.

[Upgrade the Ballista Arrow to a Burst Ballista Arrow, which requires a universal upgrade design diagram X1]

Judgment Success!

So......

[You lose 3 bottles of wine, get the universal upgrade blueprint X11!] 】

After the mall evolved into the World Trading Mall, the speed of receiving quotations was much faster, and he immediately selected the highest bidder and successfully traded.

The others take their time and are not in a hurry.

Next......

Upgrade!

[You have obtained a Burst Ballista Arrow!] 】