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After stipulating three contests, Chu Xingyun did not stay much and left the city's main palace directly.

All the way to Tiangong Island, Chu Xingyun gathered thirty-six Tiangong craftsmen and gave orders.

Over the next month, he worked hard to devise an arrow that could strike the ground troops violently.

Facing this order, the thirty-six craftsmen were immediately excited. Without a word, they directly invested in the research.

Chu Xingyun also put down everything and entered the reincarnation space, using the characteristics of the reincarnation space, the time is ten times slower, and stretched the time of one month to ten months.

The reason why Chu Xingyun still dared to make an appointment of three times with only one month left is because in the reincarnation space, he can stretch one month to almost one year!

Chu Xingyun did not believe it, and within a year, he could not study it.

Time passed day by day, within the White Tower, Shui Liuxiang never went out. The battle of the Liuyun team was led by Gu Man and continued to win.

On the other side, on the Tiangong Island, with the efforts of millions of abyssal beetles, large areas of land were compressed into earth **** and sent into the underground small world.

Especially the bamboo shoots in the soil were transported to the underground world in batches and buried in the soil. After watering, the first batch of bamboo shoots in the underground small world has grown.

Within the 3,000 academies of the Demon Clan, the first batch of 30 million students has also started to formally start classes. Under the guidance of 3,000 female officers, it is increasing rapidly every day.

Around Chu Xingyun, everything is booming.

But Chu Xingyun's side, but encountered great trouble.

The greatest strength of the Rune Way is that you can use ordinary materials to refine the arrows of a king of veins.

The biggest shortcoming of the Rune Way is that the material is too ordinary and the arrow is too brittle. Once it reaches the range, it will disintegrate into the sky.

The so-called, at the end of the strong crossbow, can not wear Lu Yan, the same is true of the rushing sharp golden arrow.

After many tests, this difficulty cannot be overcome at all.

I have been studying in the reincarnation space for three months, which is the ten days of the world of heaven and earth, but I have never made progress.

Finally, Chu Xingyun had to give up this direction and abolish all related research.

In fact, if you think about it for a while, it would be crazy if ordinary materials can be used to make royal artifacts, and the strength is still the same.

In this way, Chu Xingyun can mass-produce permanent royal artifacts, even royal artifacts, how is this possible!

Not only did Chu Xingyun not make any progress here, but the thirty-six artisans still had no clue.

In anxiety, Chu Xingyun finally remembered the demons and the three thousand female officers.

The so-called one-person short, two-person long ...

Since one cannot figure it out, why not start a seminar and brainstorm?

With this idea in mind, Chu Xingyun did not dare to neglect, to know ... There is only 20 days left before the one-month deadline.

All the way to the Royal Palace of the Demon Clan, Chu Xingyun summoned three thousand female officers for the first time.

The 3,000 Academy is temporarily closed, and 30 million students conduct self-study. One month later, the first assessment will be conducted. Those with lower grades will be eliminated from the Academy.

At the top of the underground mountain range, Chu Xingyun sat on his knees on the altar built from white jade.

This sacrifice roof is a huge platform for the demons.

But for Chu Xingyun, it was just a two-meter high podium.

On the platform, you can press and hold a futon, and a short table, sitting on the futon, with a white jade short table in front of you, and a pen, ink and paper inkstone on it.

Opposite Chu Xingyun, there is a semi-circle, which stands at the observatory, which has a total of 30 floors, each with 100 seats, which can accommodate 3,000 female officers.

Originally, the opinion of the demon queen was to help Chu Xingyun build a Rune Academy, but Chu Xingyun rejected it.

Anyway, it's in an underground space, where there is no wind and it won't rain. It doesn't matter if you have a roof or not.

Sitting on the altar, Chu Xingyun slowly spoke out the problems encountered, and asked all the female officers to use their brains, brainstorm, and come up with solutions.

Originally, Chu Xingyun thought that even if the strength of 3,000 people was gathered, it was not so easy to study.

But many times, things are so sudden, Chu Xingyun has just explained the problems facing him, and a little familiar figure, then Yingying stood up.

Respectfully facing Chu Xingyun, the figure said: "Supreme ... I think this problem is very easy to solve, as long as it is graded."

Graded?

Looking at the figure suspiciously, Chu Xingyun's brain quickly moved up, but he still couldn't understand what the so-called classification refers to.

Looking at Chu Xingyun's bewilderment, the figure continued: "It is on the blast wind golden arrow, tied an arrow, when the blast wind golden arrow is disintegrated, the arrow will fall off, so ...

Snapped!

Slap on the thigh, Chu Xingyun said loudly: "Yes! Why didn't I think of it? Bundling ... Second blow!"

Looking at Chu Xingyun's excitement, the figure continued: "Not only that, in fact ... if the arrow is replaced with a thin bamboo tube, and the surface of the bamboo tube is marked with a burst of flame, then ..."

Listening to this female officer's constant narrative, Chu Xingyun's eyes became brighter and brighter, yes ... it really is.

The blast sharp gold arrow is the first level, responsible for sending the arrow to high altitude.

When the blast sharp gold arrow disintegrates into the sky, it will automatically disintegrate, and the arrow will naturally dive downward.

Of course, the power of the arrow alone is still too weak, but if you engrave some powerful lines on the arrow, the result ...

Looking at the woman officer with admiration, Chu Xingyun sighed better.

Although Chu Xingyun is no worse than anyone in terms of wisdom, everyone's cleverness is actually different.

In terms of invention and creation alone, Chu Xingyun could not decide to be smart. Compared with this female officer, the gap is too great.

Chu Xingyun was puzzled, and in a flash, people had thousands of ideas, and even the subsequent development, they have already thought deeply.

A person with incomparable academic performance is not necessarily an inventor. This cannot be said that he is not smart enough, but that the types of smart are different.

And some people have only average academic performance, but they have countless whims in their minds, and they can always produce many exquisite inventions and small creations.

Looking excitedly at the demon girl, Chu Xingyun exclaimed: "What's your name?"

Facing Chu Xingyun's inquiries, other female officers could not help but show envious expressions, but the female inquired by the name was not only unhappy, but froze there, her body shaking and tears rushing down .

"To ... Supreme, don't you remember the cheap concubine?" A very soft, very sad voice rang in Chu Xingyun's ear.

Just now, Chu Xingyun thought about it with his brain. Although he saw the female officer, he actually turned a blind eye.

Seeing the other party was so sad, Chu Xingyun was very puzzled. What did he do that made people so sad? In doubt, Chu Xingyun couldn't help but looked at the past, and Chu Xingyun was taken aback by this look ...