Tower Defense: From Stoneware To Interstellar, I'm Invincible

Chapter 86: The day when the four great inventions reappeared, when the feudal civilization peaked (seeking flowers!!)

The first thing Su Yu did after going online was to add friends according to the ID given by Bo Ye.

Then he sent his item 'downgrade certificate' over.

However, there were more than one, because he was completely stunned by the explosion rate of his SSS copy.

He was just offline for a few hours.

This relegation voucher was given more than a dozen, and there were a lot of technologies, which made him feel incredible.

But if you think about it carefully, it makes sense for two reasons.

First, his current killing efficiency is extremely efficient, and he is a war machine in endless mode.

Second, the explosion rate of SSS-level dungeons has increased a lot, so the shipment rate of basic items is naturally ~ good.

On the other hand, the devil's contract gave another one, but it was green as Ye Bo said. It seems that this item will be made of gold, and it needs character.

Fortunately, I didn't recycle the golden one last time.

[Ding, within 5 hours and 30 minutes of your departure, the cumulative battle points were 1.65 billion, and the accumulated resources collected were exchanged for 40 million battle points. The current total points: 987.59 (Z)

[Due to the rapid expansion of your territory and the number of people, the probability of technological changes and triggering various events in your territory has increased significantly!】

Major Civilization Events:

[Ding! In your territory, skilled craftsmen have invented papermaking and movable type printing successively. This invention has greatly increased the efficiency of cultural transmission and the development of education. Your country has made great achievements in scientific and technological knowledge and cultural transmission. Big breakthrough. Civilization +4001

[Ding! By chance, a certain alchemist discovered that several substances mixed together can produce a strange burning effect. After many improvements, he obtained a brand new mixed substance, which is called "Black Fire 1 Medicine" in the world. . Civilization +200]

Fire 1 medicine: It originated from the art of alchemy in the Spring and Autumn and Warring States Periods. It is one of the four great inventions of the Dragon Kingdom. It was discovered in the true sense in the Sui Dynasty and was used in military affairs in the Tang Dynasty.

[Ding! The emergence of gunpowder brought about a series of military reforms. Two sergeants, Yue Yifang and Feng Jisheng, tied the bamboo tube to the arrow. The high-heat gas emitted by the rocket flies out and can go into battle to kill the enemy. It is the earliest rocket. Civilization +100]

[Ding! The principle of leverage has been rapidly spread to every corner of your country with the wide application of printing and paper. There are talented people who use this principle ingeniously, and use many iron machines to invent the trebuchet. Civilization +100]

【Exquisite picture in this chapter: giant trebuchet】

[Ding! Sinan was discovered and clearly recorded in some books of Longteng Kingdom, and it was quickly popularized. The sergeant miniaturized it and widely used it to determine the direction, march and fight! Civilization +200]

[Ding! Building Advanced - Intermediate is discovered, and your building technology enters a new field. Civilization +100]

Su Yu was deeply moved by the successive discoveries of major civilizations brought about by the SSS dungeon.

In my vast country, I was the first to invent these heaven-defying technologies, and I will never waste them this time.

We don't use gunpowder to make firecrackers anymore, do we make rockets?

A series of plans formed in Su Yu's mind.

First of all, Su Yu has greatly strengthened the defense line of Dragon City.

As the building technology progressed from the basic building exploration-advanced to the advanced building, Su Yu upgraded it to the advanced level at the same time.

The city walls of Dragon Capital adopted a compound construction method, and the craftsmen designed a 3+2 building structure.

In the middle of the three-layer stone wall, two layers of iron plates are added, and gravel, mussel shell pulp, and lime are used as a stirring material to fill it.

(The mixing mixture of clam shells, gravel, and lime is a kind of construction material discovered by humans in the early days, and its principle is similar to concrete)

But this huge project cost a lot of money, because the three lines of defense in the Dragon City are too huge, and iron is expensive in this era, it directly cost Su Yu 5 billion points

The trebuchet is also an important weapon, and Su Yu has a magical effect, and it is indispensable.

Su Yu asked to build the trebuchet to the limit of the level of craftsmen in this period, and its volume even surpassed the Dragon Warhammer.

20 meters high, projecting 500 thousand objects to 400 meters away.

They are placed in a row within the city wall, and can be thrown together in wartime, but Su Yu has its own special purpose.

In front of the Soaring Dragon Capital is a vast open area, which is very beneficial for the use of chariots and large tools.

In the past, Su Yu didn't think there was any disadvantage in this, after all, he had been invincible among his peers for too long.

But this time, they are facing the invasion of advanced civilizations. The cannons are very beneficial to the chariots of the steam age in such a terrain.

Su Yu mobilized 1 million people to resist the enemy with deep trenches and high fortifications in front of the defense line of Longteng Capital.

Limit the enemy's mobile power to the greatest extent.

At the same time, Su Yu also built a 30-degree slope with a length of 1 kilometer by using the "digging method" on both sides of the open area.

0………seeking flowers)……

The slopes on the left and right sides are facing the center of the battlefield, which is also an important part of this battle, Su Yu has other arrangements.

Such a huge project and material consumption is another 5 billion points.

Giant trebuchets cost a lot of manpower and material resources.

One million points, this creation is 10,000. Points - 10 billion

Arrayed inside the three-layer stone wall defense line.

Su Yu's 5 billion points were also crossed out for the purchase of various special military supplies.

Finally, there is the manufacture of rockets.

Huge amounts of saltpeter, charcoal, and sulfur are extracted from the mines.

Combined with the unique ratio, it is made into gunpowder.

But the rocket Su Yu needs is not a simple rocket that routinely travels a few hundred meters.

..........0

He asked to increase the filling amount of gunpowder, refine minerals, and improve the effectiveness of gunpowder at the same time.

It is also necessary to reduce the weight of other parts of the rocket, and at the same time install a stabilizer fin to make the flight of the rocket more precise and more stable.

He was warned by the system and fined 10 billion just for installing the stabilizer. Since the money can be solved, Su Yu did not hesitate.

If the money is gone, we can make more money, and if the people are gone, it is really gone.

Having money but not spending life is the greatest tragedy.

As for rockets, due to the huge cost of mining minerals, coupled with Su Yu's demand for Huang Taitian.

A total of 100 million giant rockets have been built, each 1.5 meters long, and can fly 800 meters. This is the limit that gunpowder can achieve in this era.

Each 500 points, 100 million, is 50 billion points.

Su Yu directly changed the 10 million crossbowmen into rocket launchers, each with 10 rounds.

No matter how much, Su Yu can't afford it.

75 billion points are gone, and there are 200 to spare.

[Ding! Hesitating that your GDP has failed to meet the standard, and you cannot comprehend the technology "Gunpowder Specialization". Please expand your territory and develop your country!】

[Note: GDP is a system statistical data, and there is no such concept in this era]

Su Yu: "?"

GDP? Will this data be the core in the future? Su Yu feels that he puts more emphasis on military affairs than development, and finally caused trouble.

What's the situation? Su Yu immediately clicked on the detailed description.

Today's second and seventh. .