Immortal weapon, stained with this immortal word, then it has risen to another height. If Du Feng forged a superb innate magic weapon in a few days, it would be nothing remarkable, and Niu Er would not think he was powerful. But the immortal weapon is different, because Niu Er can't create an immortal weapon yet.

"Brother, you're not here to tease me. At such a high level, do you still need me to teach?"

Niu Er really thinks that Du Feng is here to tease himself, and he even got out the immortal weapon, and he still learns from me.

"It's a fluke, it's really a fluke. ”

Du Feng did have a fluke element this time, the key problem was that he still had to learn how to use crystalline salt to upgrade weapons from others, so he couldn't be too proud.

"Okay, I'm kidding you. ”

Niu Er originally planned to wait for Du Feng to pick up the silt, and after winning him, he would show the method of using crystallized salt to upgrade weapons. In this situation, it is better to strike while the iron is hot. He can't do immortal weapons, but there is no problem with innate magic weapons. Now that the Dragon Sword is a medium-grade innate magic weapon, he can help promote to a high-grade innate magic weapon.

"Haha, you're finally reluctant. ”

Of course, Du Feng was happy because he could finally learn this method. After having this method, you can still think about how to promote the immortal weapon in the future.

Niu Er, who was still smiling just now, suddenly became serious. He mysteriously took out an iron bucket, which was much smaller than the iron bucket that picked up the silt, about the size of a bucket for ordinary families to carry water. I don't know what he meant by taking this iron bucket out, could it be a special liquid for quenching.

As a result, as soon as the lid was opened, Du Feng's eyes were straight. A bucket full of white flowers, all of them are precious crystalline salts.

"Well, it's all what I've accumulated over the years. ”

Niu Er patted his chest proudly, these crystalline salts were indeed exchanged for him through his own labor. Some of them are queued up to fetch water and then make their own products, and some are exchanged for points earned by picking silt. A bucket full of crystalline salt, but it's worth a lot of money.

"Do you need so many crystalline salts to promote a weapon?"

Du Feng pursed his lips, feeling a little extravagant and wasteful. If you just use so much crystalline salt to promote an innate mid-grade magic weapon to an innate high-grade magic weapon, then the price you pay will inevitably be too great. Even if you promote an innate high-grade magic weapon to an innate top-grade magic weapon, it won't be cost-effective.

"Haha, just watch it, I'll only demonstrate it once. ”

Saying that, Niu Er took out a congenital high-grade magic weapon-level weapon, this weapon was not a knife or a sword, but an iron flat pole. This iron pole looks exactly the same as the one used to pick up the silt, but it is of a higher grade.

Tut-tut...... It seems that Niu Er is very confident in his own technology, and he even used the innate high-grade magic weapon to demonstrate directly. If this promotion is successful, it will become an innate superlative magic weapon. It's still not comparable, but it's pretty good.

Niu Er first put the iron flat pole into the furnace and calcined, and at the same time grinded a crystalline salt into powder and slowly sprinkled it into it. During this calcination process, the temperature should not be too high, and the weapon should not be melted into molten iron. But the temperature can't be too low, because if it's too low, the weapon won't burn through. It has to be red to be effective.

The whole process lasted about half an hour, and Niu Er consumed a total of three crystalline salts in the process. It's all crushed into powder and sprinkled evenly into it, and it feels like adding spices. Sprinkle pepper when eating barbecue, probably like this.

After the calcination process is over, it is quickly clamped out with large pliers. The next thing is to put it on the forging table and beat it, and the shape remains the same during the beating, and it feels like knocking in the substance that was just sprinkled into it.

After hitting it repeatedly like this for a while, the sword slowly cooled. Then it needs to be put back into the furnace and continue to heat it, and during the calcination process, it is necessary to continue to sprinkle salt into it.

Calcining, sprinkling salt, and beating, after this process is repeated three times, nine crystalline salts have been consumed. When the fourth calcination is done, no salt is sprinkled, but it is burned until it is red and about to melt. Take it out while it's hot, and quickly insert it into the bucket full of crystalline salt.

There was no water in it at all, and it was densely packed with crystalline salts. Immediately after inserting it, white smoke came out, and it had a strange smell. After inserting the upper half for a while, the lower half is inserted upside down. Swap it over and over again until the weapon cools down entirely.

After it had cooled down completely, Niu Er put the iron flat shoulder back on the forging table. This time, I changed to a small hammer and struck it quickly from beginning to end. The upper arm does not move, while the lower arm shakes slightly, mainly using the strength of the wrist to tremble at high frequency.

This tremor is not a blind tremor, but has a certain frequency. After a certain number of strikes, the entire blacksmith shop emitted a buzzing sound, as if the surrounding space resonated with it.

Awesome, how did he find out about this method. Calcining, salting, beating, the whole process seems so simple that it can be mastered by one person. But the first person to invent this method was definitely a forging genius.

It's easy to learn by watching someone else do it, but it's really hard to come up with a method on your own. There is only one place where Du Feng does not agree, that is, in order to insert the crystalline salt into the cooling, it is necessary to constantly pour it at both ends. If it's a large vat of crystalline salt that's deep enough, how good it would be to insert it all at once.

Well, Du Feng is right, in fact, Niu Er also wants to do that. But the problem is that a large vat of crystalline salt is not so easy to get. You must know that every time you sprinkle powder, you have to consume several crystalline salts. When it is inserted and cooled, although the crystalline salts do not disappear, they actually decrease overall. If you convert it, the amount consumed is also about 10 pieces. In other words, this trip down, remember to consume about 20 crystalline salts.

He had been accumulating for a while to be able to advance a weapon, and he had not been able to get a large vat of crystalline salt. It can be said that storing enough vat of crystalline salt is a dream of Niu Er.

"Hey, what's so hard about this, I'll accompany you to hunt tomorrow. ”

Du Feng understood as soon as he heard it, Niu Er wouldn't make money after a long time. It's one thing to have technology, it's another to make it money. Although crystalline salt cannot be bought directly with money, the lake water has to be exchanged for fairy stones. The exchange price of a bucket of water is a second-order immortal stone, and each person only has a quota of one bucket of water per day.

Du Feng believes that there are always some people who are willing to sell their quota for money, but the price is higher. In addition, the points earned from hunting can also be exchanged for a lot of crystalline salt.