Setting up a hiding place, Duanmu Yu was the first thing he had to do to quickly refine his own sword weapon. Although he was extremely conceited, without the quilted bow in his hand, it would be equivalent to half of his combat power. Otherwise, he would not have to escape this time. No matter how bad he was, he would have the power to fight.

Duanmu Yu was very skilled in refining the sword weapon, but the first thing he needed to do was to refine the thousand kilograms of cold iron ore.

In fact, normally, when purchasing cold iron, most practitioners will choose the refined cold iron ore. On this basis, they will refine the cold iron into ten years, hundred years, even three hundred years, and five hundred years!

But Duanmuyu knew that the cold iron ore actually contained another extremely rare material, but few people knew, was sharp gold sand!

This sharp golden sand is collected by practitioners above the purple qi realm and can only collect it from a dangerous place. If you can get one or two, it is enough to make the flying sword extremely sharp. This kind of material is simply impossible for the collector to appear in the market, because often there are not enough of the collector himself!

However, the cold iron ore does contain this sharp gold sand. Although it is pitiful, almost no one knows this secret, because cold iron is not the best material for refining flying swords. Once the cultivation reaches the realm of the star aggregate, a higher-quality flying sword will naturally be refined. At that time, the refined cold iron for 500 years is too poor.

Therefore, those who really need cold iron are practitioners under the Lingtai realm, but the problem is that practitioners in this realm cannot find the existence of sharp gold sand from this cold iron ore.

For those practitioners at the level above the star convergence, they may discover that the cold iron ore contains sharp gold sand, but they have abandoned cold iron. Since they do not contact it, they will certainly not understand it.

This is like the princess of the Great Qin Empire with a noble status. Her destined person is a beggar gangster hiding among beggars in the city. It is obvious that as long as the two of them look at each other from a distance, they will fall in love at first sight, but the fact is that even if they pass by countless times, it will never be possible for them to look at each other.

This is the wonder of creation! The extremely high-quality materials that are hard to find are hidden in the lowest, simplest and most common materials.

Who can believe it if you say it?

Of course, even if high-level practitioners come into contact with cold iron occasionally, it is impossible to discover this secret. Because Duan Muyu himself was looking for a piece of demon stone fragment that was said to be sealed in a large piece of cold iron, so he had to refine the whole piece of cold iron bit by bit until five hundred years. In the end, he did not find the fragment of demon stone, but he obtained two taels of sharp golden sand from the large piece of cold iron ore. This was definitely an accident. Unless others had such an opportunity as him, no one would know this secret.

Therefore, Duanmuyu has now chosen to buy a total of 1,000 kilograms of cold iron ore. Although this amount of crude ore can only refine about one cent of sharp gold sand in the end, it is enough. The quality of this sharp gold sand is too high, more than two cents. With his current strength, he cannot refine sword weapons normally.

It is not possible to refine cold iron ore with ice condensation method. Fire refining must be used, but normal fire refining methods will treat sharp gold sand as impurities and will be eliminated during the first refining, so the ice condensation method must be used to assist. This is the most basic principle for refining sharp gold sand.

A thousand kilograms of cold iron ore, an ordinary practitioner in the Dongxuan realm, can be refined within three days, but if you want to refine it into ten years of cold iron, it will take three months. As for the hundred-year cold iron, that is, cold iron of the same quality as Yingruo gave Duanmuyu, it will take at least three years, three hundred years of cold iron will take nine years, and five hundred years of cold iron will take eighteen years!

Duanmuyu did not intend to refine this thousand kilogram of cold iron ore until five hundred years, because the total amount of cold iron he obtained in the end would not exceed one or two taels, which was meaningless. The sword weapon he refined was just a hundred years of cold iron. This thousand kilogram of thick ore would eventually give him five kilograms of cold iron, which was enough to refine a sword weapon.

However, Duanmuyu is not an ordinary practitioner. Three months is enough for the ice condensation method and the fire refining method. This also involves separating the sharp gold sand from the cold iron ore.

In a flash, the pursuers really couldn't find this place. In the cave, Duanmuyu sat cross-legged, Xiaobai was holding an ice spirit fruit on his shoulders and gnawing happily. Now his lazy habits are getting worse. Every day, except running out to eat an ice spirit fruit, he will get back into the bed and continue sleeping, and he doesn't care wherever he is.

Opposite Duanmuyu, a calender with a height of one person was slowly circulating. Under the calender, twenty-four flames were shining slowly. In addition to the flames, there was a huge ice covering it, which looked very strange. It was actually the same furnace of ice and fire.

In the refining cauldron, the thick ore of cold iron that was originally weighing thousands of pounds was refined to the size of a fist of one person. It was just a small piece, weighing five pounds. This was the refined century-old cold iron. At this moment, this piece of cold iron has become extremely smooth and delicate. Although it is still dark, you can feel the sharpness contained in it!

In addition to this cold iron, there is also a little star light. It is not bad, just a little bit, smaller than rice grains, but the light emitted from it completely compares the relatively huge cold iron. One is the king's honor and the other is just an ant!

This is a qian of sharp golden sand separated from the cold iron coarse ore!

Extremely sharp, unbearable! Looking around the world, indestructible!

After a silent smile, Duanmuyu stopped the refining cauldron. For him, this refining cauldron could only be used as a semi-finished utensil. If he really wanted to refine the whole, he still used the ice condensation method, which was the most perfect!

Taking out the century-old piece of cold iron and sharp gold sand, Duanmuyu was not in a hurry to do it, but patiently waited for Xiaobai to eat and drink. After getting into the bed and sleeping soundly, he took out eight ice spirit fruits and put them beside him. In the next nine days, he had to focus on refining sword weapons, so he couldn't take care of it.

When Duan Muyu waved his hand, a cold air was released and instantly condensed into a square piece of ice. The center of the ice was as his will changed, and eventually formed a groove of a sword weapon. Unlike the fire refining method that requires final shape, the ice condensation method must determine the shape of the sword weapon in advance.

At this moment, under Duan Muyu's mind control, the groove of the sword weapon continued to change, forming various shapes. He always liked to do things perfectly, and within his ability, he would never leave any flaws.

In the end, the sword weapon was completely fixed and long three feet per inch. The sword edge was like a flying feather, extremely lively, and there was a phoenix feather mark at the hilt of the sword.
Chapter completed!