Under Lao Jiu's strong request, Mi Baoer had no choice but to rest. However, considering that Lao Jiu hadn't rested well for a few days, Mi Baoer insisted on taking Lao Jiu to rest together. As for the barrel of the amethyst cannon, it was handed over to the group of forgers of the Easy Empire to experiment.

It's just that the two of them don't sleep, and one sleep is a day's time. By the time the two woke up again, it was already noon the next day. Concerned about the matter of the cannon barrel, the two of them just made do with some food, and then rushed towards the underground base.

When the two of them arrived at the place, the mold of a cannon barrel was almost formed, and everyone was putting the finishing touches on the cannon barrel. After Lao Jiu and Mi Baoer waited for a while, the forging of the entire barrel was finally completed.

Then there was a professional rune master who began to inscribe rune formations on the barrel of the cannon. Seeing the last crucial step, Lao Jiu was also a little nervous. If the rune inscription fails, then everything is in vain.

Fortunately, after more than an hour of inscription, the key formation of the Amethyst cannon was finally branded on the barrel, and then a group of excited people began to assemble it again, and in the end, it was still Lao Jiu who personally tested the cannon.

"Boom!" When the first shot is successful, it means that Lao Jiu's materials have been successfully replaced, which also indicates that their free empire will finally have their true heritage from now on.

"The cooldown time is three minutes, which is a bit long!" Lao Jiu probed the amethyst cannon after the launch, and said with some dissatisfaction, "Record this data first, and we will continue the test later." ”

After the cooldown time arrived, Lao Jiu started the test gun again, and when the second shot was fired, the cooldown time was directly increased to half an hour. And when the third cannon was fired, the cooldown time directly reached one day, which made Lao Jiu feel the pain of the egg.

"Grass, the power of this amethyst cannon is strong, but this cooldown time is too painful. If all amethyst cannons are like this, then his deterrent power is too limited! After the test, Lao Jiu said speechlessly.

"Brother Jiu, do you think there is a way to shorten the cooldown time? The cooldown time of the Amethyst cannon fire, which is obviously related to the temperature that the barrel is subjected to, is it possible to reduce the cooldown time of the cannon firing if we start from this aspect? Mi Baoer looked at Lao Jiu and suddenly asked.

"How's this going? The barrel of the cannon is already engraved with an energy gathering rune, and it is impossible to repeat the inscription of other runes. Lao Jiu said with a frown.

"Besides the rune formation, we can have other methods!" Mi Bao'er glanced at Lao Jiu and said, "We can start with the materials, and in addition, we can also achieve our goal by inlaying the Demonic Beast Crystal Nucleus!" ”

"Master Gao, what are the attributes of the giant bone you use to forge the barrel?"

"Mrs. Hui, it is a ninety-level Titan giant ape calf bone, which belongs to the earth attribute. At the beginning, we only considered the hardness of the material and ignored this problem. Hearing Mi Bao'er's question, Master Gao hurriedly replied.

"We still have a level ninety snow wolf leg bone in our warehouse, as well as the leg bone of the Canglong, you now use these two materials to make two cannon barrels, and then I will take an ice attribute magic core, you attach it to this cannon barrel, and then we will do another experiment." Mibel looked at them and said.

"Okay, let's get ready." Master Gao immediately responded.

"Brother Jiu, you take them to retrieve Canglong's leg bones, which are in the underground base of Canglong Island. I'm going back to the imperial capital, the snow wolf's leg bones and ice attribute magic cores are there, I'll come over in a while. Mi Baoer said to Lao Jiu again.

"Okay, I hope we don't disappoint this time." Lao Jiu said.

After seeing Mi Bao'er leave, Lao Jiu put away the amethyst cannon, and then returned to the underground base with everyone again. Not long after Lao Jiu took the leg bones of Canglong, Mi Baoer returned from the imperial capital, so the two of them waited directly in the base.

The first thing everyone experimented with was the inlay of the ice attribute magic core, but fortunately, there was enough space on the barrel, so this improvement of the Easy Empire went very well, and the successful inlay of the magic core made Lao Jiu and Mi Baoer see hope.

More than three days passed in a blink of an eye, and under the overtime of everyone, the other two cannon barrels were also successfully built, so after spending another day to build the base of the cannon, the three amethyst cannons were placed on the beach of Canglong Island.

After the first round of testing, the cooldown time of the three cannons finally came out, all of which were one minute. After the second round of firing, the cannon made of dragon bones and snow wolf bones cooled down for three minutes, while the cannon inlaid with ice attribute magic cores showed that it was still one minute.

This made Lao Jiu feel very shocked, but after his careful inspection, he found that the magic core originally embedded in the amethyst cannon would also consume energy with the launch of the cannon, and according to Lao Jiu's final estimate, one magic core could only last ten cannons.

After the conclusion was reached on the amethyst cannon with the magic core, Lao Jiu did not experiment again, but did the final experiment on the other two cannons.

As a result, the two cannons could only fire a maximum of four shots a day, and the cooldown time of the last cannon was an hour. For this result, Lao Jiu is already very satisfied, and what they need to do now is to produce this amethyst cannon in large quantities.

"Brother Jiu, you said that after the demon core is consumed, can you still fire three or four cannons? If this is the case, then a cannon can fire thirteen or fourteen times a day. Mi Baoer tilted her head and thought for a moment.

"It should be like this, after all, the consumption of the magic core is independent, but we can't afford to experiment now, so far, we have wasted tens of thousands of gold coins, this guy is really burning money." Lao Jiu said with some emotion.

"Don't people say: When the cannon goes off, the gold is ten thousand taels!" Mi Baoer rolled her eyes and said.

"So, the main role of this thing is to deter, if you really only rely on the amethyst cannon, then after a war, it is estimated that even we will go bankrupt!" Lao Jiu looked at Mi Baoer and said.

"By the way, our empire doesn't have many ice attribute demon cores in storage, and most of these ice attribute demon cores are from the Snow Wolf Plain, I don't know if the water attribute magic core can be replaced?" Mi Baoer seemed to remember something, and suddenly said to Lao Jiu.

"This ...... What you're saying is really important, and it looks like we're going to have to break the bank again! Lao Jiu thought about it for a while, and finally decided to do another experiment.

But with experience, this time it's much faster. Everyone directly replaced the ice attribute magic core, and then inlaid a water attribute re-experiment. The results came out quickly, and the water-attribute magic core was indeed okay, but the consumption of the water-attribute magic core was twice that of the ice attribute.

In other words, a complete water-attribute magic core can only sustain the Amethyst Cannon to fire five cannons. After getting this result, Lao Jiu was about to cry. For now, this amethyst cannon is completely a money-burning thing.

Now the price of magic cores on the market is about to break a thousand gold coins, and the amethyst consumed by the amethyst cannon is a major burden. Nowadays, if you want to maximize the power of the cannon, then you must attach the magic core, which is simply not something that ordinary empires can afford.

Even Lao Jiu didn't expect that the task of this amethyst cannon was secretly hidden with such a hand. However, this secret is currently known only to them, even if the Xiaoyao Empire sells amethyst cannons to the outside world in the future, then everything will be under the control of the Xiaoyao Empire.

"Brother Jiu, can we produce amethyst cannons in large quantities now?" At this time, Mi Baoer said with some excitement.

"Of course, this amethyst cannon will be the true foundation of our Carefree Empire in the future, as long as our city defense is equipped with amethyst cannons, then see who dares to offend my Carefree Empire." Lao Jiu said very domineeringly.

"But at the same time as producing the Amethyst Cannon, we also need to acquire something. Ice attribute and water attribute magic cores, before other empires know about it, we must empty the two magic cores on the market. ”

"The other thing is the material for making the barrel, those large animal bones, which are also the key to our procurement. However, these need to be acquired under other pretexts, so that the two of them can help, and try not to arouse the conjecture of other empires. ”

"Let Sister Tingting do this, I'll inform Sister Feng again, we also have a lot of cooperation with other empires, see if we can exchange some materials with them." Mibel said.

"Two fat? Her IQ can't be messed up, right? Lao Jiu said with a frown.

"Do you think Sister Ting has worked in vain in the past few years, if you hear Sister Ting, you may be more sad. People don't know how much they have paid for you, you don't even inquire, when it comes to Zhu Erpang of the Easy Empire, how many people don't know? ”

Mi Bao'er rolled her eyes and said dissatisfiedly, "How many years has Sister Ting been in charge of the empire's procurement, do you think she is still a rookie before?" If you put your heart in your stomach, will I still pit you? ”

"That...... I'm just talking about it casually. Lao Jiu smiled awkwardly, and then asked Mi Bao'er, "With our current inventory, how many amethyst cannons can we produce?" How long will it take? ”

"With our empire's current inventory, we can build up to five thousand amethyst cannons. In addition, we do not have a professional production line for amethyst cannons, and when everything is built, it is estimated that it will take two or three months to build 5,000 amethyst cannons. Mi Baoer thought for a moment and said, "And I'm going to build a separate Amethyst cannon production base, which will take a lot of time." ”

"Okay, let's go back and discuss the specific matters, just hold a small meeting to make arrangements for our next development." Lao Jiu thought for a while and said.