Duolun decided to pay the bill because the royal family really had money, and he hesitated before because the bill was also a little scary. You know, he promised Li Anna that 20% of the bills would be paid with gold coins.

In contrast, gold coins are the least valuable in the eyes of the strong, but for a nobleman, there must be enough gold coins in the territory to operate.

The financial business in this world is relatively simple, but it is not rudimentary.

However, this bit of gold is not difficult for the marshal, after all, such an expensive position is also worth the money. Li Anna is not a trick on him, Li Anna didn't leave before, and she was letting the magician strengthen her position day and night.

These are all included in the cost, which is not unusual at all.

For example, inside the tunnel, after entering, there is a piece of solid ice blocking the road, which is to prevent the enemy from forming an impact formation.

This piece of ice, reinforced by the magician day and night, is already as hard as metal, and it is difficult to destroy. Can you use it as a regular ice cube?

As for all kinds of long-term magic traps, they all automatically recognize badges and have huge network computing power.

The royal family has a similar magical build, acting as a computing core to deal with the pitfalls laid by this network. The magic tower itself also has this ability, but the biggest role of the magic tower now is to support all locations.

Half of the magic tower, the Void Magic Monument, these two are the most valuable things.

As I said before, the Void Magic Tablet was originally a generic model, but after it was installed, the magician practiced day and night, and the level increased a lot.

The important thing is that it is well integrated with the half-cut magic tower, and it can exert its maximum power.

On the third day, Li Anna received the money and started the handover business with the royal family. More than 30,000 of her own, she crossed the Great Wall of Ice, avoiding the army of the god of magic, and headed east. The army of the god of magic did not chase this force, and still attacked the royal legion.

This made Li Anna feel that it was worth it, and she sold her position, and the army of the god of magic cooperated to let herself go.

Anna marched all the way, and after a few days, she returned to Mithril City.

After returning to Mithril City, Li Anna hurried to meet the two senior brothers.

The fourth senior brother's face was a little round, and although he was not so fat, he was still affected by this face. But he looks kind and angry, and looks harmless to humans and animals.

Seeing Li Anna, the fourth senior brother smiled happily: "Little Anna, you're finally back, I'm still afraid that you will be cheated by the royal family." ”

"What a pit, the royal family talks about the rules, they can't pit me, and I don't dare to pit them. That is, there is one thing to say, what is according to the rules. It's tasteless. ”

"That's good, look at my design of Mithril these days. ”

"Good. Anna nodded to Lynn, sat down, and began to scour the papers.

The design of Mithril City is really adapted to local conditions, because it is rich in Mithril and geothermal energy, so the construction here may not be so cheap, but the operating cost is very low.

The Mithril Cave itself is connected to the underground world, but the passage is narrow, and it is impossible to mobilize troops.

There are three passages, two of which have been laid out with tracks and re-reinforced to allow metal trains to walk. It's not a problem to transport anything. The remaining one, which is too narrow, is blocked by magic, and if there is no identity verification, it will be killed step by step.

The underground passage doesn't make much sense, mainly to prevent enemies from entering Mithril City from the underworld.

Therefore, the exit of the three channels has built a military chemical industry, and no materials can be transported on a large scale anyway, so it should be a simple passage for people to come and go, and safety comes first.

Then the fourth senior brother heard that Mithril City was going to become a center and a military location, so he simply played a big game, and the new design of Mithril City was extended from the underground cave, like a towering tree, and it took root underground.

The material of this big tree is Mithril ore, if the Mithril content is low to a certain extent, the ore is not worth refining, but the properties of this ore itself are also very peculiar, the mage of the dukedom simply researched a fusion method, adding other substances to it, so that the ore with a very low Mithril content can be re-dissolved and turned into a hard artificial stone.

This is much stronger than artificial stone made from raw coal, and its properties are stronger than obsidian.

So, this is a huge magical city, the underground part is intertwined, and the above-ground part, the core is a huge building with a diameter of nearly a kilometer, rising upwards, like the design of Mt. Kongo. But Mount Kongo is a structure that gradually narrows upward, and Mithril City is a bit like the Forest of Demon Worms.

The huge core city looks like a banyan tree on the top, and many thick stone pillars hang downward.

Such a man-made structure completely protected the entrance to the Mithril Cave, and the ground surrounded Mithril City, and the outer city was built.

The outer city was made of artificial stone by ordinary people, only in key locations, and new Mithril artificial stone was used.

It's not that Mithril City can't afford to spend this money, it's that this Mithril artificial stone has to be provided to other large buildings in the Dukedom, which every city needs.

In this way, Mithril City's financial problems were also solved.

Li Anna was also shocked when she saw the progress of the construction. The patriarch really spared no effort to support him, and there were only more than a hundred Taoist priests in this world, all of whom were sent, and then the students of Asra Academy were also sent over to do the task.

The above-ground part of Mithril City has begun to take shape, and the underground part is much worse, but it is not too anxious. The magic array using geothermal heat is complete, and the rest is left to take its time.

The Mithril City on the ground part, the core building mask is huge, just like a small city, five miles long.

Then the outer city wall extended outward for another two and a half miles.

Outside the outer city walls, many mountain bags have been flattened, leaving the rudiments of Mithril fortresses, the material replacement has been completed, and the most troublesome parts of the refining work have been completed.

All that's left is to work slowly and meticulously to enrich the city's heritage little by little.

This Mithril City is not comparable to the large cities of the Dukedom, but it is more than ten miles in diameter. If you count the various Mithril fortresses on the periphery, the diameter is almost twenty miles in size.

The fourth senior brother said, "The outermost part itself will also be within the protection range of the magic shield. ”

"Why isn't the city wall built outside?" asked Anna Li.

"When I built this city wall, I took advantage of the topography and the problem of the underground structure, this circle of city walls is the strongest, and even if it is built on the periphery, at most it will be the same as other cities, not outstanding at all. Besides, when Mithril City needs a larger territory in the future, it will expand the city walls outward. ”

"It's a waste of time. ”

"We brought in a lot of raw coal, and the royal family sent a lot of it, and what I asked for was part of the bill. The royal family is happy to pay the bill with raw coal. The construction on my side requires a large amount of raw coal. When the construction is completed, there will be a large amount of cinder to make artificial stone. The foundations of the outer walls can be repaired now. As for completion, there's no hurry, after the Mithril Academy is built, let the students build it slowly. ”

Li Anna looked at the map again and found that the City Lord's Mansion, the Mithril Academy, and the Mithril Legion Station had all been planned.

"Fourth Senior Brother, the City Lord's Mansion is built so luxuriously, you are using your power for personal gain!"

"Anna, of course I want to use power for personal gain, I will take root here in the future, do things for you, and have a face. And this design still has to consider safety issues. My combat power is not as good as the two of you, so I have to cultivate the place where I live to be advanced enough. ”

"Well, if you die, it's a huge loss for me. Li Anna also admitted that the design of Mithril City is still very good, and it is strong enough according to local conditions. On the envisioned drawings, after the final completion, it is also beautiful.

The Mithril Wall is eye-catching in itself.

But in fact, the amount of Mithril contained in the mile-long city wall may not be enough to make an alloy dagger.

It's so beautiful, it's the use of silver, and a variety of experimental alloys.

In the future, Mithril City may be a commercial city and a strategic location. To make people believe in you, you have to put on enough strength. It's like a businessman doing business and meeting with customers and getting a few luxury carriages.

The Mithril Tower at its core has now become a behemoth with a diameter of a kilometer, and of course the internal facilities are complete.

This is much more powerful than an ordinary magic tower, and the Mithril Legion is simply stationed inside and connected to the underground cavern.

Li Anna looked at the bill casually, it was also quite scary, but it was worth it. The fourth senior brother designed all this, but in actual operation, it was still Xia Cheng's side to help, the computing core of King Kong Mountain, to help calculate, and build the city, without wasting time and strength, and without wasting energy.

For example, the refining of the core Mithril City used a large number of magic furnaces. These magic furnaces consume raw coal.

The used raw coal and residue are transported directly to the periphery to create artificial stone, which will be further processed in the future, and all of them will be replaced with mythril artificial stone.

Now it's just a key node to build it to ensure the city's defense.

As for the outer Mithril Fortress, it is purely the result of artificial transformation of various mountains on the original surface.

The fourth senior brother said: "After the protective shield is propped up, the soil I want will also arrive, and the entire formation will be operational, and the ground will be able to plant demon plants." ”

"This artificial lake is a bit small, isn't it?"

"If you supply water to the underground, although there is water in the underground world, it's best not to use it, it will change the geological structure. Later, when there were more people in the underground Mithril Cave, I could only send water down from the ground, but fortunately this is an ice field, and there is no shortage of water, so I built a small reservoir on the ground. ”

This man-made reservoir is used to pump water into the ground for a long time. Li Anna glanced at the underground structure, there was nothing wrong, obviously the Taoist priests also participated in the construction, even the water escape technique, they could not enter the underground cave through this reservoir.