Crossfire is easier to do, but long-range strikes are a bit more difficult. As a rabbit who has become terminally ill with a phobia of lack of firepower, Lu Yun means that if the pill in his hand is not exhausted, he will never go up to hand-to-hand combat, and the first batch of explosive flame charms can only be regarded as an appetizer, and the long-distance blow in the back can be regarded as a meal.

And this long-range strike, which cannot be standardized in this world, is the most troublesome part.

You know, the metal manufacturing process in this world can almost only rely on blacksmiths, what does it mean? It's just that one thing is made with too much error.

According to Lu Yun's original design, he could reduce the power of something like the Flame Burst Talisman that could produce a huge gas expansion effect in an instant, so that it could achieve the effect equivalent to gunpowder.

But things can't be standardized......

The caliber of this cannon is 10 centimeters, the other one has 1 millimeter more, the third one has one millimeter less, and so on......

What to do with shells?

"And that kind of statement?" Elder Huoyun was particularly moved to listen to it—he hadn't heard such an interesting statement in a long time.

And what shells, and what air swells......

"Yes, the principle of this thing is to use the Flame Burst Charm to create a large amount of gas in an instant, and after these gases expand outward, they can push the things inside to cause an extremely high initial velocity," Lu Yun tried to explain the principle of the cannonball in simple language: "In this way, the cannonball inside can cause great damage." ”

Elder Huoyun: "......"

Mo Wushuang: "......"

Still a little incomprehensible......

"Ahem, good boy," Elder Huoyun coughed lightly, and asked without understanding, "Why does the expansion of the gas push the cannonball......

"Forget it," Lu Yun looked frustrated: "You don't understand what you said." ”

Elder Huoyun: "......"

Mo Wushuang: "......"

"Less nonsense!" Elder Huoyun was suddenly furious, he thought about it, and then jumped up: "Anyway, it's not in a hurry to find trouble with those giant apes, it doesn't matter if it's two days earlier or two days late, I really don't believe it, let's go to Li Tiezhu, make one out and show me first!" ”

Lu Yun: "......"

Elder Huoyun has such a violent temper, he doesn't understand such a fun thing, is it possible?

Immediately, several people brought in Li Tiezhu's team and built a simple cannon barrel according to Lu Yun's requirements.

Naturally, this barrel cannot be of the same high quality as the barrel of a tank on Earth, so it can only be said to be straight enough.

Lu Yun made a simple ruler with a horse rope and measured it for a long time, so that it could finally be used so-so, and it was barely about the same level as the flash thunder placed on the earth.

"And then?"

Elder Huoyun took the cannon barrel: "Just such a thing, can it make effective kills?" ”

To be reasonable, he doesn't believe this.

No matter how you say it, it's a giant ape at the foundation level, but it's not an ordinary ordinary product, and it's hard to break through the defense without a divine weapon at the same level, what kind of cannon is this......

"As long as it's a carbon-based creature, I'll kill you!" Lu Yun is very confident in this thing.

During this time, he had a very personal experience of the power of the Flame Burst Charm, and there was no problem with one Flame Burst Charm being equivalent to 5 grams of TNT.

So if you want to make a simple earthen cannon, there is absolutely no problem - the control yield is actually nothing more than a question of how much charge it is.

Lu Yun took out a bullet-shaped artifact.

Because there are no high-end materials, Lu Yun's idea is to simulate a pistol to make a single, but the model is a little larger.

The middle of this big bullet is made of a tree trunk called the Iron Flower Tree, which is a relatively common tree species in this cultivation realm, characterized by its high density, and it can't float up in the water, especially after it is dried, the hardness is very high, and many bows and arrows used by Orion are made of this thing.

The inner core is polished from the trunk of an iron flower tree, and the outer part is wrapped with a layer of iron sheet, and this simple bullet is completed.

Lu Yun has been measured, and the diameter is about five centimeters.

"And then?" Elder Huoyun looked at Lu Yun with a roar.

Now that the barrel is ready, the bullets are ready, the next thing is to fill the gunpowder inside. If you want bullets to fly, you can't do without gunpowder.

Lu Yun took out the folded spirit rune and stuffed it into the barrel, this is very particular, this spirit rune has no lead, so it can only be connected through the energy delivery array, fortunately, he can be said to be handy in this regard, so the most troublesome step is the easiest for him......

"Okay," Lu Yun held the barrel of the cannon and led a group of people to the edge of the village.

There are a few lessons of the 300-year-old crooked neck iron flower tree, and the villagers have long wanted to cut down these few trees, but this thing is too strong to cut down, so it can only be like this.

Now that he heard that this Lu Yunxian was going to make an artifact, he immediately came to see the excitement.

"I heard that the immortals want to make artifacts, it is said that the power is quite great!"

"How big can it be? Are you going to cut down this crooked neck tree? ”

"Impossible, right? That crooked-necked tree has grown for more than 300 years, and its trunk is harder than iron, how many firewood knives have we chopped off? Even the axe is broken! ”

"Who knows, it's an immortal after all!"

"Yes, yes, yes, look at the excitement, look at the excitement!"

Lu Yun took Elder Huoyun and Mo Wushuang to stand in the open space at this time, and Lu Yun directly stuffed the cannon barrel into Elder Huoyun's hand: "Master, you have a high realm and are strong, just stay away from Senior Brother Mo and I." ”

Elder Huoyun: "......"

So this realm of tribulation is just a long sturdy in your eyes, right?

"Are you really sure this can be that powerful? Do you have to come to Lao Tzu with a catastrophe? "Elder Huoyun really thinks it's a bit overkill.

But Lu Yun was very sure: "Yes, after all, it's an experiment, if you fail and hurt me, are you distressed?" ”

Elder Huoyun: "......"

I feel sorry for a hammer!

But anyway, seeing that the theoretical artifact was about to be released, Elder Huoyun was still very excited, he took a deep breath, to be honest, he was really curious, just this thing, can it be more fierce than a sword at the foundation level?

I'm afraid it's unlikely.

But what Lu Yun said was very serious, and the most important thing was that it was indeed a long-range strike weapon according to the description, so Elder Huoyun was still very serious.

He held the tail of the barrel and began the countdown.

"Five!"

"Four!"

"Three!"

"Two!"

"One!"

Counting to one, Elder Huoyun directly transmitted the aura into it through the formation diagram at the end of the barrel.

Suddenly, the weakened version of the flame burst charm inside the barrel let out an earth-shattering roar!

"Boom ——!!!!"

The terrifying power of the shock, even with the strength of Elder Huoyun, his hand shook involuntarily!

An amplitude of about 0.01 mm!

This is not low, you must know that he is in the realm of tribulation!

And just on the other side of the cannon mouth, a terrible air flow rushed to the ground, and the cannonball made of the trunk of the iron flower tree made the eyes could hardly see the trajectory of movement, and only saw that most of the trunk of the crooked-necked iron flower tree that was aimed in the distance was shattered by this blow, and the cannonball exploded into the remaining trunks!

"Gaba—"

After another five seconds, the iron flower tree hit by the missile let out a tooth-aching creak and slowly fell!

Everyone: "!! ”

Elder Huoyun looked at the power of the missile, and his eyes and mouth were all open!

Elder Huoyun: (‧̣̥̇꒪່⍢꒪່)!