The flying sword hadn't even reached the lava-filled nest when a sudden pillar of magma turned it into thick water.

Qing Yu frowned, this was obviously someone who applied the effect of induction enchantment and defensive enchantment, and the defensive enchantment obviously had the effect of common terrain, making full use of this strange geographical environment.

But fortunately, he brought the token that Lin Wanguan gave him, as long as he showed the token, he could enter safely and would not be attacked, of course, the token would turn into smoke, and there was no need for a token to get out of the enchantment.

He took out the token and threw it forward, and the token turned into smoke in mid-air, and it was as if a door appeared in front of his eyes, and Qingyu entered.

The Yin Ghost Qi in Qing Yu's body only had two days left, and he had to hurry up and complete his magic weapon refinement, and then he could leave here, cross the Broken North Mountain, and go straight to the Chuyun Continent.

He walked straight to the fire nest and cast a low-level small spell on himself, allowing himself to endure such high temperatures.

Qing Yu looked at the color of this magma flame, nodded with satisfaction, and took out the blue-veined sword from the storage bag, as well as a few small jade bottles, and didn't know what it contained.

That day, after "Haoyangzi" Shi Haotian told him some things about "Haoyang Swordsmanship", he saw Qingyu's blue-patterned steel sword and showed a weird smile.

According to him, blue-veined steel is an extremely rare material in the world, but he didn't expect Qingyu to have a piece, which is one of the best materials for refining weapons.

But this thing has a huge drawback, that is, it is extremely difficult to quench, the first time is very simple, just like building the sword in Qingyu's hand, the cast iron master among mortals, using mortal fire, can also be created.

Although this weapon can still be called a divine weapon among mortals, it is completely inadequate among immortal cultivators.

With the increase of the number of quenching, the difficulty of green steel also increases exponentially, just the second quenching, it is not the foundation building period monks can do it with dantian real fire, only by borrowing the high-temperature flame of earth fire, can the quenching be completed.

The earth fire used also has strict requirements, and the stable earth fire is divided into three kinds, one is the kind of earth fire with extreme yin qi that Qing Yu has seen in the ghost platform of the ghost spirit sect, and the second is the general common earth fire, which is neither yin nor yang, suitable for forging most magic weapons, and also suitable for the refining of most pills.

And what Qingyu needs is the third kind, that kind of pure masculine earth fire, which can be regarded as his luck, and this ground fire of the Lin family is still a pure masculine ground fire.

Strictly speaking, what Qingyu has in his hand is not Qingwengang, it should be called Qingwen iron, it is just a kind of crude ore, and it has not yet reached the level of steel.

Qingyu needs to dissolve this sword completely first, and then purify it according to what Haoyangzi taught him, and convert iron into steel, and the sword that has just turned into steel is pure black, also known as black-veined steel.

And after that, the ten refining black striped steel is purple steel, the hundred refining purple striped steel is the blue striped steel, and the thousand refining blue striped steel is the real green striped steel, as for whether it can still change after continuing to quench, then I don't know, Haoyangzi didn't tell him, maybe he thinks that it is impossible to complete this kind of thing in this human world.

The black-veined steel sword is comparable to the top-grade magic weapons, while the purple-veined steel sword is comparable to those high-quality magic weapons, and as for the blue-veined steel, it is enough to compare with some ordinary magic weapons.

If Qing Yu can purify the blue-veined iron into black-veined steel, this is his limit, it should be said that it is the limit of an immortal cultivator in the foundation building period, and he only has two days.

Without saying anything else, Qingyu used his mana and threw the sword into the magma, and instead sat up in front of the magma, sensing the state of the sword with his divine sense.

Time passes by minute by second, and it is a day in the blink of an eye.

Qing Yu's forehead was covered with beads of sweat, he didn't expect that it would consume so much of his mana and divine thoughts, and if he persevered like this, within an hour, he would not be able to hold on.

The most important thing is that this Yang Earth Fire is like a poison to him, devouring his mana and cultivation, and the Yin Ghost Qi in his body is only one and a half hours left.

Just when Qing Yu was about to lose his hold, he had an idea, and took out three hundred medium-grade spirit stones from his storage bag, one hundred and fifty pieces were added to the still rolling earth fire, and the remaining one hundred and fifty pieces he stretched out a hand, grabbed them tightly with exorcism, and refined them without stopping.

In this way, he lasted for another half an hour, and finally he felt that the long sword had been almost refined, and urged the mana with all his strength to take the long sword out of the earth fire.

At this time, the long sword had completely turned into a ball of molten iron, and Qingyu, who was sweating profusely, tried his best to control the molten iron, and then controlled the various jade bottles on the side, they exploded one after another, and a cloud of unknown liquid flew into the molten iron.

These liquids are called "quenching liquids", which are also found in the Chuyun Continent, and they are a kind of thing that are often used by those refining masters, which can increase the success rate of refining weapons, and also have a special effect on extracting weapon molten iron.

This is Qingyu who replaced all the spirit stones he should have obtained from Lin Wanguan with these things, and it seems that the exchange is not a loss, because with the addition of these liquids, Qingyu suddenly felt a lot more relaxed, and the speed of purification was also much faster.

When Qingyu really couldn't hold on, a sword light emitted from the tip of the sword, and a pitch-black and shiny long sword floated in the air.

Although this sword is the same as the Yin Ghost Long Sword, their essence is not the same at all, the black sword in his hand is full of a bright yang aura, like the sun in the day, and the Yin Ghost Long Sword is like the moon in the night, the Yin ghost aura is pervasive, eerie and terrifying.

If Qing Yu uses mana, he can't use the sword in his hand, which will only reduce his strength, but there is no problem when he uses internal force.

Qing Yu stroked the sword very lovingly, then put it into the storage bag, and immediately meditated to restore mana.

Although he still doesn't look down on the power of the Black Striped Steel Sword, this is a start, because its upward potential is huge, and no one knows how far it will grow.

Maybe in the future, Qingyu will have the opportunity to refine it into a real blue-patterned steel sword.

Just when Qingyu was resting, not far from this place, almost a few miles, a carriage was speeding away, and the driver of the carriage was also dressed simply, but his face was indeed sallow, as if he was afraid of something.

In the carriage, there was an extremely beautiful girl, she looked thirteen or fourteen years old, but her beauty could already be said to be at the level of disaster for the country and the people.

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