The so-called earth, fire, and heavenly furnace are used by cultivators to arrange corresponding formations on the fire veins to control the flames and forge magic weapons. Jiang Bo's statement that it is a heavenly furnace is actually a bit exaggerated, because the scale and function are much worse. But the basic technique is pretty much the same, enough for him to use now.

It took about ten days of hard work, Jiang Bo finally built a small heavenly furnace with a length and a width of one zhang and a thickness of five feet, mainly made of stone and supplemented by gold and iron. In appearance, this object looks more like a special pool. Among them, there are several horizontal and vertical grids, and there are some delicate mechanisms hidden in them, which are used to inhale and aspire, control fire, and so on. Jiang Bo buried the talisman that condensed the earth's qi on the ground around him, and then embedded the small heavenly furnace into the rock and soil, and sat on the opening of the earth's leylines that he had passed through before. Finally, he gently broke the leylines with mana and re-introduced the earth fire into the furnace. This process is simple to say, but difficult to operate, and it took Jiang Bo another five days to complete it. Once this thing is completed, the rest of the things will be easy to do. Jiang Bo took out the blackiron ingots and hematite anvils that had been prepared in advance, as well as several hematite forging hammers of different sizes and shapes.

Hematite is a special kind of iron ore, and the less impurities, the darker the redder the color. This thing is only produced in Hongyao Country, and it is several times heavier than normal iron ore, but its hardness and ductility are not as good as normal iron ore. It is said to have been formed by the blood of an ancient demon god poured on the Iron Mountain, but there is nothing unusual about it other than being extraordinarily heavy. Because of its characteristics, it is also difficult to process into useful utensils. However, the people of Hongyao have found a different way for its nature, and have created a variety of unique weapons to equip the army. These weapons are all powerful blunt weapons, and they complement each other well with the stout and powerful warriors of the Red Yaoguo. For example, a hammer gun with a spear head in front of a gourd, a chain hammer with an iron meteor and a handle, a one-man wall shield used to deal with heavy cavalry, a four-edged mace specially used to break horses' legs, and so on. Most of the people of Hongyao are ordinary people and the mixed blood of the southern barbarians, and they are born with divine powers, so they like to use red iron to build blades. But out of Hongyaoguo, there is only one role left for hematite, which is to make a forging hammer. Because of its heavy and dense iron, blacksmiths who can forge the craft of making steel are willing to use red iron hammers. This time, Jiang Bo was going to refine the sword ring by himself, and specially bought a forging hammer. Listening to the master craftsman of the blacksmith shop talk about the benefits of the red iron hammer, the old master said with regret that it is a pity that this Cold Spring Mansion is located in the north, too far away from the southern Hongyao country, and he can't buy red iron. Jiang Bo had an idea at that time and thought of Su Dingxiang. He and Hong Yaoguo have been fighting all year round, and they can't be sure that they will loot a few hematite weapons. So he found Su Dudu, and as soon as he mentioned this matter, Su Dingxiang immediately asked Jiang Bo to bring more than ten four-edged maces. These are all trophies he captured, which is very effective against cavalry, so he really hoarded some to train sword players, but it is convenient for Jiang Bo. Jiang Bo took these things and asked the old blacksmith to build him a set of forging hammers of different sizes and weights, and also gave the old blacksmith a large set of red iron, which made the old master happy.

After everything was ready, Jiang Bo began to smelt the dark iron according to the method taught by Master Leng, and used true qi to wash the dark iron to remove impurities. It took a full day to gradually reach the heat. Without hesitation, he began to forge it. He carried the Nine Turns of the Styx Xuanlang Gong, and in the continuous hammer blows, his true qi penetrated into every minute of the Xuantie block. Jiang Bo's original True Qi was the Netherworld True Qi used by the outer disciples of the Youquan Sect that Weng Lao had taught him, which was the most ordinary and basic thing. The advantage of Netherworld True Qi is that it can be transformed into any kind of true qi of any kind of lineage, any kind of Nether Spring Sect exercises. Therefore, after Jiang Bo learned the Nine Turns of the Styx Xuanlang Gong, he has been slowly transforming his true qi. But this is a water mill work, and it can't be achieved overnight, but the exercises of the Longyuan Sect provide a shortcut. It allows him to compress the Xuaniron through the extreme use of True Qi forging in a very short period of time, and comb and reforge the True Qi. At first, Jiang Bo still used his true qi smoothly, and after three days of sleepless and crazy forging, he could no longer suppress the true qi that was eager to vent. The whole person also fell into a mechanical and trance state, as if everything outside the body did not exist, and there was only one thing left between heaven and earth.

It took Jiang Bo a full fourteen days to gradually wake up from this state of concentration. When he came to his senses, he realized that the original piece of black iron the size of a human head had been forged into a fist-sized piece. And his strong true qi was completely depleted, and five of the seven forging hammers he brought were seriously deformed and distorted, and they had been scrapped. Exhausted, Jiang Bo threw the dark iron into the small quenched pool, and lay down on the nearby land regardless of it. If it weren't for the fact that his Youquan Golden Body was too strong, not only would his true qi be long and strong, but also give him the ability to open the valley in advance. There was absolutely no way he could have lasted so many days. Jiang Bo rested for a day and then began to repeat the previous movements, stopping and beating several times, and in three months, the volume of Xuantie was reduced by him by one-third. At this point, no matter how much he beats, he can't subtract half a point. Jiang Bo knew that the time had come, so he placed this piece of dark iron in a place in the heavenly furnace where the fire was mild and stable, so that it could be kept at a certain calcination temperature. Then he took out a small jade bottle, carefully poured out a mass of viscous liquid from it, and poured it on top of the dark iron. The object is a dull blue color, with silver particles shimmering in it. It seems to be a syrup made of nephrite, which is very beautiful. This thing is called lapis lazuli and jade, and it is a rare spiritual material. It can be used to refine the elixir of gold and stone qi, and can also be used as an auxiliary material when refining magic weapons. Its function is to make the spiritual materials of different materials blend with each other and not repel each other. And Jiang Bo used it because this thing was also good at absorbing and gathering true qi, and it was an indispensable material for refining sword rings. Lapis lazuli is usually produced in the depths of the mountains and is dug out of a gray stone ball. Some people say that this thing is actually the essence and blood of ancient beasts. It's not very valuable, but it's very rare. Jiang Bo used a one-foot-long spirit sealing crystal to get it from Mo Chenghuang. At that time, Lord Chenghuang still wondered how Jiang Bo knew about this uncommon spiritual material. Of course, Jiang Bo couldn't say that this was taught to him by Master Leng's divine thoughts, this was the exclusive recipe for refining the sword ring of the Longyuan Sword Sect. It's just vaguely that the seniors of the sect told him that it can be used to refine the body. Because it involved the sect's exercises, Mo Chenghuang didn't ask deeply.

Jiang Bo wrapped the jade fat with his true qi and slowly and evenly cast it on the dark iron, controlling them to slowly fuse. It's a painstaking process, but it doesn't take long. Jiang Bo was well prepared, so it was done overnight. The next thing was much simpler, he tried to create a sword ring with a piece of dark iron according to the unique technique of the Dragon Yuan Sect. After this sword ring was finalized, although the appearance was decent, it could only carry the same amount of true qi as Jiang Bo's own true qi, which could not meet the requirements. The reason why the sword ring is powerful is that it can hold several times its own true qi, and it is used to deal with opponents whose strength is higher than its own. Only having the same level of true qi as oneself is equivalent to uselessness. Jiang Bo rested for a day, summed up his experience, and created a second one. This time, he only cared about adjusting the capacity of the sword ring to hold true qi, but he forgot the track of the spiritual energy in the sword ring. As a result, after doing a good experiment, the sword ring was broken.

After two misses, Jiang Bo stopped work for a few days and thought about it repeatedly. Finally, it was discovered that his failure had something to do with not using the jade grease mixed in the dark iron well. After summarizing, I seriously recalled what Mr. Leng taught me. Jiang Bo suddenly realized an idea, the reason why the magic weapon can store and release true qi is because there must be something equivalent to a spiritual vein in it. Just like those flying sword recipes of the Youquan Sect, there will be such a system in each of them. The sword ring must be the same, but Master Leng didn't tell himself clearly. I think it's because after all, it involves the secrets of other people's sects, and it's too clear to tell, so I still have to leave some blanks for Jiang Bo to realize. After thinking about this, Jiang Bo made a plan with reference to the spiritual vein node of the Youquan Sect's flying sword. When he created it for the third time, he controlled the lapis lazuli jade grease to form a spiritual vein inside the sword ring. This time it went very well, and he finally created a sword ring that could hold three times his true qi. Jiang Bo summed up his experience and made persistent efforts to create two sword rings. So far, he has truly mastered the refining method of this magic weapon. In the past few months, he has gained a lot. Not only did he learn to refine the sword ring, but with the continuous forging, most of his true qi was transformed, and his meridians became stronger. The biggest gain is that his experience in refining magic weapons has reached a higher level, and he really has a little bit of a way out.

After that, Jiang Bo took out the Dajiang Dongliu Sword and exercised it, repairing the sword body that was damaged when he fought with Chen Wang. He also used the truth of his enlightened magic weapon spiritual veins to truly connect the rune nodes in the flying sword to become the completed qi veins, completely activating the Great River Dongliu Sword. After the finalized flying sword, the appearance has not changed much, but there are seven more words on the sword, "its own river flows eastward". But Jiang Bo could feel that it was much sharper, and even if he carried the Youquan Golden Body, he didn't dare to fight this sword head-on. Monks who don't usually know how to refine the body are even more vulnerable in front of this sword. Even in the face of Xuanguang cultivators like Chen Wang, Jiang Bo was sure that he could hurt them without using all his strength. Dancing with this long-favorite flying sword, Jiang Bo couldn't help but be enthusiastic. He suddenly had a feeling that if this sword was completed, maybe he would usher in a different cultivation career.