Mortals ask the immortals

Thinking of this, Duan Qing waved his hand excitedly, took the invisible sword embryo into his hand, and looked at it carefully.

No matter how he looked, the naked eye could not find the existence of the sword embryo in his hand, as if there was nothing in his hand at all.

Duan Qing was amazed. This was the first time he had seen such a magical thing.

I just don't know how effective this invisible spiritual treasure will be when used in actual combat.

He suppressed his excitement and had no intention of continuing to refine the sword embryo. He carefully put away the invisible sword embryo, then picked up the nine top-grade spiritual stones with serious spiritual energy loss in the circular groove on the wall, and left the weapon refining workshop directly.

Now he couldn't be sure whether this invisible sword embryo would return to the shape of a barren stone like the previous two times.

So he planned to wait for a while to make sure that the sword embryo could exist for a long time before refining other sword embryos.

...

A month later, Duan Qing came to the weapon refining workshop again and rented a weapon refining room.

Sensing the invisible sword embryo in his hand, a faint smile appeared on the corner of his mouth.

A month later, the sword embryo still showed no signs of returning to the barren stone. It seemed that this sword embryo had been completely shaped by him.

At this time, Duan Qing had no more scruples and decisively put away the sword embryo in his hand. Then he took out the barren stone and began to refine the remaining sword embryos.

Piece after piece of barren stone was thrown into the Nine Revolution Refining Furnace, melted into liquid and shaped into sword embryos.

This refining took a whole day, during which he did not dare to be distracted at all, for fear of making mistakes.

More than 600 pieces of barren stone were refined into sword embryos by him, without a single piece left.

Including the first one a month ago, there were a total of 108 sword embryos.

The sword embryos refined later, like the first one, were all invisible sword embryos.

Sensing the pile of sword embryos in front of him, Duan Qing was excited and felt very painful.

These 108 sword embryos not only consumed all the barren stones in his hands, but also almost consumed all the spiritual stones on his body.

To activate the Nine-Turn Earth Core Fire in the Refining Room, nine top-grade spirit stones are needed each time, and it cannot last too long.

Using the Nine-Turn Earth Core Fire for a whole day continuously consumes up to two hundred top-grade spirit stones.

The top-grade spirit stones collected from Dugu Qiuyu and Biquan's bracelets were not enough. In the end, he sold the last few golden corpse inner pills on his body to the sect shop to solve the urgent problem.

Now he is penniless.

Even though he has almost exhausted his fortune in refining these 108 sword embryos, he does not feel any regret.

No matter how many spirit stones there are, they are useless if they cannot increase strength.

Once this set of flying swords is refined, his strength will definitely increase greatly.

I just don't know if he can control 108 flying swords at will with his current mental strength.

Thinking of this, Duan Qing took out all the sword embryos and tried to perform the sword control technique to control all the sword embryos at the same time.

Under his control of the sword technique, the 108 invisible sword embryos on the ground immediately rose into the air and moved across the refinery room.

At first, all the sword embryos could shuttle back and forth without affecting each other, but after a while, two of the sword embryos suddenly collided with each other, making a sound of metal colliding.

The collision of the two sword embryos was like a fuse, causing more sword embryos to collide continuously.

For a while, the sound of ding-dong was endless in the refinery room.

Duan Qing wiped the sweat from his head and smiled bitterly.

It was still a bit difficult to control so many sword embryos at the same time.

Especially since these sword embryos are not spiritual treasures yet, he can't control them as easily as the spiritual treasures that have recognized their masters.

In addition, he found another problem.

Although these invisible sword embryos are not easy to be discovered by the enemy when they are used, they are quite troublesome for the enemy.

But for him as the controller, there are also inconveniences.

In the past, he controlled the flying sword mainly with his naked eyes and supplemented by perception. Only with the combination of the two, he could control the flying sword like an arm.

But even he himself could not observe these invisible sword embryos with his naked eyes, so he could only rely on perception to guide when controlling them.

Not only did he have to rely on perception to determine the position of all the sword embryos, but he also had to ensure that all the sword embryos did not interfere with each other.

The difficulty here was much greater than controlling more than a hundred visible flying swords.

Even with his mental strength, he felt quite stressed.

It seems that he still needs to practice more.

Duan Qing breathed a sigh of relief, and did not mean to practice now. Instead, he picked up an invisible sword embryo on the ground, put it in his palm and pulled it hard, cutting his palm.

Blood dripped down the sword embryo to the ground, but Duan Qing did not change his face, held his breath, and silently recited the formula in his heart.

As Duan Qing chanted, the blood on the sword embryo suddenly seemed to come alive, and began to gather to the center of the sword body, forming a "Qing" mark on the sword body.

After the "Qing" seal was formed, the light shone brightly in an instant, and then quickly disappeared, sinking into the sword body and disappearing.

After doing all this, Duan Qing let go of the sword embryo, sensing the weak connection between the sword embryo and the sword embryo, and nodded with satisfaction.

This seal is the seal of the soul, which is the most critical step in the heart refining method.

The heart refining method comes from the demon clan. When many demon clans use the heart refining method to refine spiritual treasures, they often use the parts of their own demon bodies that have been shed.

The demon body of the demon clan itself has a certain connection with itself, so when it is used for heart refining, there is no need to use the soul seal additionally, and it can be directly washed with demon power.

However, if one is not using one's own demon body, one needs to plant the Soul Seal on the material used for the Heart Refining, using one's own blood essence as a guide.

This Soul Seal is actually equivalent to the recognition of the master of an ordinary spiritual treasure.

If the material for the Heart Refining itself has nothing to do with oneself, then only after planting the Soul Seal can the Heart Refining begin.

Duan Qing is not a demon, and these sword embryos have nothing to do with him. They are all made of wild stones, so naturally the Soul Seal must be planted first before the Heart Refining can succeed.

After some effort, Duan Qing planted the Soul Seal on all 108 sword embryos, and his face turned a little pale.

He lost a lot of blood essence in one breath, and even with his strong body, he was a little overwhelmed.

After having the Soul Seal, Duan Qing clearly felt a magical induction between himself and all the sword embryos.

This induction is somewhat similar to the blood contract induction between him and the Illusion Butterfly, but it is not exactly the same, and it is obviously much weaker.

At this moment, even without perception, he can vaguely know the position of all the flying swords.

After a short rest, he tried to use the sword control technique again to control all the sword embryos.

With the induction of the soul seal and the guidance of perception, he was much easier to control the sword embryos this time. Although he still felt a little strenuous, there was no collision and chaos as before.

After controlling for a long time, he stopped and was quite satisfied with the effect of the soul seal.

The soul seal that had just been planted could have such an effect. When he completely completed the heart refinement, he would be more handy to use it, not inferior to the spiritual treasures recognized by the traditional method, and might even be better.