It requires both high strength and low weight, which is simply not possible with the materials currently mastered by the Ministry of Industry. But Li Mu has a system, and the situation is different.

Forging this skill, at the beginning, there is only one secondary skill, smelting. Promoted to intermediate, there is one more refinement. Now that it has been promoted to the advanced level, it has an additional secondary skill - alloy. It was this skill that gave Li Mu confidence.

[Alloy: A metal is mixed and melted with another or several metals or non-metals, and then cooled and solidified to obtain a solid material with special metal properties. 】．

Since it is for higher protective strength, the first choice is, of course, alloy steel.

An iron-carbon alloy composed of an appropriate amount of one or more alloying elements on the basis of ordinary carbon steel. According to the different added elements and the appropriate processing technology, special properties such as high strength, high toughness, wear resistance, corrosion resistance, low temperature resistance, high temperature resistance, and non-magnetic can be obtained.

Alloy steel can be said to be everywhere in Li Mu's previous life. Ninety-nine percent of all the 'iron' things as far as the eye can see are alloy steel. There are many types of alloy steel, with tens of thousands of specifications and models, and some special steels, such as those used in the military field to build aircraft carriers and submarines, are specially produced and difficult for ordinary people to reach.

Fortunately, there is a system in place that can solve this problem.

According to the needs of the system, Li Mu synthesized ordinary iron ore, meteorite iron, and charcoal according to a certain ratio, and successfully produced a high-strength alloy steel. At the same weight, this alloy steel has five times the protective strength of ordinary iron plates. With it, the plate armor that originally required fifty catties of iron can now achieve the same protective effect with ten catties of alloy steel, which is thin and lightweight.

The effect of alloy steel made Li Mu excited. But looking at the list of consumables for materials, he instantly calmed down. A cart of iron ore and two pieces of meteorite iron only synthesized less than eighty catties of alloy steel. Eighty catties of alloy steel can barely make two sets of plate armor. Calculated down, the cost of a set of plate armor is as high as more than 1,000 guan.

If you use this kind of alloy steel to arm a cavalry, a rough calculation will cost at least 10 million yuan.

Who can afford this? Even Li Shimin just wants to arm a million cavalry. What's more, even if there is money, in today's conditions, it is impossible to mine so much iron ore and meteorites that provide rare elements!

Therefore, alloy steel is destined to be scarce. Maybe after building Li Chongyi's set of plate armor, it will be difficult to make another set.

Li Mu carefully calculated the weight required for each part, and after calculating, there were still about thirty catties left. After thinking about it for a while, he decided to return Li Chongyi's existing [Blood Hell Battle Axe] to the furnace and retrain it, adding this rare alloy steel to it. Moreover, when he created the [Blood Hell Battle Axe], it was only an intermediate forging, but now that he is a high-level forger, the attributes forged must be much stronger.

A set of high-grade plate armor, plus two high-level weapons. Such a configuration, in the game "The Legend of the Tang Dynasty", at least it must be equipment that can only be owned by the main fighters of the middle gang.

A day passed in the process of smelting synthetic materials, and when he was eating at dusk, Li Mu calculated the cost of materials, and it was as high as three thousand. And that's not even counting the red bronze that was going to be added to the armor when it was time to build it. If you count it, it's at least twice as much.

In addition to the six thousand kan who bought the drawings-

Li Mu's brain began to hurt again, this kind of spending money, ordinary people are really enough to stand it. Li Mu glanced at Li Chongyi, who was gnawing on the leg of mutton without heart and lungs, and said secretly in his heart, silly brother, if you go to Zhenla this time and don't make a name for your brother, you really can't live up to your brother's heart...... And get into the money!

That night, I fell asleep again. The next morning, the sound of striking iron sounded again. The materials were prepared yesterday, and this time it's time for real.

The first piece of equipment built by Li Mu was the [Blood Hell Battle Axe] that was rebuilt in the furnace, and the battle axe was completely melted down to remove impurities and mixed into alloy steel to be rebuilt, and it was finally built for a whole morning.

[Bloodhell: Purple quality one-handed axe.] It is like a tiger's teeth, wide open and closed, majestic and domineering, the whole body is covered with red silk, and the blood is like a siphon, so it is called 'Blood Prison'. 】．

[Base Strength Requirement 20].

【Endurance 10】.

The quality has been upgraded from blue to purple, the weight has been reduced from eighty-one catties to sixty-four catties, and the increased attribute points have changed from 3 points each for strength and endurance to 10 points for stamina, which is a good improvement.

After eating at noon, the brothers began to build another axe, the [Shura Battle Axe] that could be combined with the [Blood Hell Battle Axe], and at dusk, the [Shura Battle Axe] was also completed.

[Shura: Purple quality one-handed axe.] The shape is like a scissors, vertical and horizontal, fierce and fierce. Soul devouring, hurting people is not counted, hence the name "Shura". 】．

[Base Strength Requirement 20].

【Strength 10】.

In order to balance his left and right hands, Li Mu also controlled the weight of the axe at sixty-four catties. Strength plus 10 is also a good attribute for a warrior. What made Li Mu even more excited was that with the birth of [Shura], the attributes of the suit composed of two axes were also revealed.

[Bloodthirsty: The bloody breath causes the warrior to enter a state of rage, forget the pain, and wield the twin axes to brutally suppress the enemy. 】．

The effect of this set, to put it simply, is that the more you fight, the more courageous you become. For a berserk battle, it is definitely a superb attribute.

Li Mu used the remaining alloy steel to make two iron cables. Both ends of the iron cable are equipped with brackets. It is possible to connect two axes together, and to connect the axes to the arm guards, no matter how Li Chongyi uses it, when he rushes into the enemy formation and uses the "Whirlwind Slash", the axe will not fly out and not be able to find it.

Eat, sleep. On the third day, Li Mu and Li Chongyi began to build the [Blood Refining Battle Armor].

Crafting armor is much easier than crafting weapons. One morning, the helmet and cuirass were created, and at dusk, a little extra shift, arm guards, skirt armor, and waist guards were also created.

But this time I didn't have the luck of yesterday, the whole armor set was all blue quality, and there was not a single purple equipment.

[Blood Refining Helmet: Base strength requires 10, stamina 5.] 】．

[Blood Chest Guard: Base strength requires 10, strength 5. 】．

[Blood Refining Waist Guard: Base Strength Requirement 10, Endurance 3, Strength 2. 】．

[Blood Refining Skirt Armor: Base strength requires 10, stamina 2, strength 3. 】．

[Blood Refining Armguard: Base strength requires 10, stamina 5. 】．

[Bloodforge 2/5: Strength 10.] 】．

[Bloodforge 4/5: Stamina 10.] 】．

Although the attributes made Li Mu a little disappointed, it did not affect the shape at all. And Li Chongyi's physique is there, wearing this set of domineering battle armor with a faint dark red streamer due to the mixture of red copper, with the two axes of Blood Hell and Shura, it is like killing the god in the world. If you are a little more timid, you can be scared to death.

"How does it feel when you put it on?"

Li Chongyi moved for a moment and said, "It's not much heavier than leather armor." ”

When Dugu Jiu heard this beside him, he frowned and said, "Big brother, can such light armor be able to guard against arrows?" ”

"Arrows?" The corners of Li Mu's mouth hooked up a smile, and he was just about to say that he would let Dugu Jiu draw his sword and cut it, when he suddenly remembered that his sword was a golden equipment with the characteristic of "sharpening iron like clay", so he quickly held back his words and changed his words: "Don't worry, ordinary arrows will never hurt, not even a seal, I don't believe you go get a crossbow to try." ”

Dugu Jiu was really real, so he turned around and went to get it. In Li Mu's car, there was a repeating crossbow. This is what he prepared for emergencies, if someone besieges him, Dugu Jiu can't deal with it in time, he has a crossbow that can resist for a while.

Li Chongyi also wanted to know how strong the protection of this light armor was, and when he saw Dugu Jiu coming back with a repeating crossbow, he asked him to shoot arrows at himself. Dugu Jiu refused, and even the crossbow buckled the bracket, and the arrow flew out. He was worried that if the protective effect of the armor was not good, it would hurt Li Chongyi.

Li Chongyi repeatedly said that it was okay, but Dugu Jiu refused, so he had no choice but to take off his cuirass and hang it on a tree for experiments.

Dugu Jiu pressed the bracket, and ten short arrows shot out sharply. Just listen to the crisp sound of ping-pong, and then look at the armor, there is no damage at all. Ten short arrows, all cut by the curvature of the surface of the cuirass and flew away, and none of them did any damage.

After the test, Dugu Jiu finally put his mind at ease. Seeing that Li Chongyi had such good armor on his body, he was also happy. After three full days of busy work, it can be regarded as a success. There was still a little alloy steel left unused, and it was carefully put away by Li Mu. I plan to make a dagger or something for self-defense in the future.

Tomorrow is the day of departure. In the past three days, Li Mu has continued to give orders to prepare for Li Chongyi's trip. The blacksmiths of the factory stopped making ploughshares for the time being, and went all out to make crossbow arrows for repeaters. In the past three days, I have saved a lot, enough for five hundred brocade guards. Liu Shenwei was there, and Li Mu also said hello. An emergency medicine kit has been prepared for Jinyiwei, whether it is internal or external injuries, miasma poisonous snakes, etc., it can be dealt with. On Wang Ou's side, Li Mu also called someone to inform her and asked her to prepare three sets of clothes for each Jinyi guard, which she kept for changing along the way. Li Ying also handed over a message there, asking him to prepare several carts to transport people when he went and used to transport rice seeds when he came back. Even, he asked Bai Hao'er to find a cook and prepare dry food for Jinyiwei......

No matter how big or small, as long as Li Mu can think of it, he has prepared it for Li Chongyi. In the final analysis, he still doesn't feel at ease, after all, no matter how tall and strong Li Chongyi is, he is only fourteen years old. Out of sight, how can Li Mu be at ease. What can be done now, Li Mu has already done everything. If there is any more accident, he can't help it, he can only say that it is providence.

On the last night before parting, the three brothers tacitly agreed that they did not go back to the tent to sleep. Roast chicken, beef jerky, pour three cups, champion red. After a few words, I drank silently until dawn.