Mortals ask the immortals

This flying sword is about three feet long and two fingers wide, of moderate size. The sword body is streamlined, and there is an exquisite ring on the hilt, which connects with the sword body.

After shaping, Duan Qing controlled the newly refined sword embryo and put it into the special water tank in the corner of the refining room.

The water tank contains heavy water specially prepared by the refining workshop for refining. Quenching with heavy water can enhance the strength of spiritual treasures.

Hiss, hiss, hiss!

The red sword embryo was put into the heavy water, but nothing abnormal happened. There was no white smoke, and the heavy water did not boil. It was as if a piece of pig iron was put into the water tank.

The heavy water was as black as ink, and the situation of the sword embryo inside could not be observed.

After a while, Duan Qing took out the sword embryo, and the sword embryo had completely cooled down.

The color of the sword embryo after cooling down was obviously lighter than that of the barren stone. The barren stone was bright yellow, while the sword embryo was light yellow.

Looking at the sword embryo in front of him, Duan Qing nodded with satisfaction, and was about to put the sword embryo away and start refining the next one.

However, at this moment, something unusual happened.

The sword embryo in Duan Qing's hand suddenly made a slight sound, and then the entire sword embryo began to deform and shrink.

In just a few breaths, the sword embryo returned to the shape of the previous barren stone.

Duan Qing frowned and was speechless for a moment.

If the color of the barren stone was not much lighter at this time, he would have thought that everything before was a dream, and he had not refined a sword embryo at all!

The recovery ability of this barren stone is too strong. After melting and shaping into a sword embryo, it can be restored to barren stone!

At this moment, Duan Qing didn't know whether he should be happy or depressed.

The stronger the recovery ability of the barren stone, the stronger the flying sword he refined.

But the question is, what should he do in this situation?

If the barren stone can't be shaped, how can he refine a flying sword!

No, no!

He Changzai had mentioned that he had successfully refined a spiritual treasure with wild stone, which showed that wild stone could be shaped.

And just now he had successfully melted the wild stone and shaped it into a flying sword, and the sword embryo recovered itself after a while.

Thinking of this, Duan Qing glanced at the refining furnace, and then looked at the pale yellow wild stone in his hand, thinking.

Could it be that the burning power was not enough to completely shape the wild stone?

Duan Qing sighed, and embedded two more top-grade spiritual stones in the circular groove on the wall of the refining room, adding the original one, a total of three.

With the embedding of the latter two top-grade spiritual stones, the earth's core fire gushing out from under the refining furnace also changed from one to three, shooting in from the tails of three five-clawed golden dragons, and then spraying into the furnace from the dragon head on the top of the refining furnace.

Then, Duan Qing threw the restored pale yellow wild stone into the refining furnace, and cast the pure green fire himself, cooperating with the earth's core fire to burn the wild stone.

Under the burning of the three core fires and Duan Qing's pure green fire, the barren stone quickly melted again.

Duan Qing followed the previous steps and began to shape the sword embryo and quench it.

After the quenching was completed, the refined sword embryo appeared in front of Duan Qing.

This time, the sword embryo was almost the same as the previous one, except that the color was a little lighter and looked a little transparent.

After refining the sword embryo, he did not continue to refine the next one, but picked out the three top-grade spirit stones on the wall that had lost a lot of spiritual energy, and quietly observed the sword embryo refined for the second time.

After waiting for about half an hour, the sword embryo on the ground suddenly made a subtle sound, and then, like before, it began to shrink and deform, turning into a piece of light yellow with a little transparency.

Seeing this scene, Duan Qing sighed and felt relieved.

It was indeed a problem of burning power!

Without any hesitation, he decisively put the three top-grade spirit stones he had taken back into the circular groove, and took out six more top-grade spirit stones to fill the entire circular groove, so that the top-grade spirit stones in the circular groove reached nine.

The strongest earth core fire in the sect's refining workshop is the nine-turn.

If this nine-turn earth core fire, plus his pure green fire, cannot completely shape the barren stone, then he can only temporarily give up refining the sword embryo, and wait for a while, and try again after improving the attainment of pure green fire.

Shortly after the nine top-grade spirit stones were placed in the circular groove, nine surging blue flames suddenly shot out from the bottom of the refining furnace, accurately shooting into the small holes of the nine dragon tails, and then spraying from the dragon head into the interior of the alchemy furnace.

For a time, the fire in the refining room was blazing, and the earth core fire from the refining furnace illuminated the entire refining room in a deep blue.

Duan Qing did not dare to delay, and put the recovered barren stone into the refining furnace again, and then cast the pure green fire to start refining the sword embryo.

This time, after seeing the barren stone melt, he did not rush to cast the fire shaping technique to shape it, but waited quietly.

After about a dozen breaths, the barren stone that had long been melted into liquid in the refining furnace suddenly boiled, bubbling out, and making a crackling sound.

The liquid barren stone boiled for about two or three breaths before the bubbles stopped bubbling and finally returned to calm.

To be on the safe side, Duan Qing waited for a while, and saw that the liquid in the refining furnace really had no movement, so he cast the fire shaping technique and began to shape the sword embryo.

With the experience of the previous two times, Duan Qing shaped and quenched it in one go this time, and his movements were smooth and there was no delay at all.

After the quenching was completed, he controlled the sword embryo to fly out of the heavy water tank and was stunned.

There was nothing in the air, and only a transparent flying sword outline could be vaguely seen, dripping with dark heavy water.

Soon, all the heavy water on the surface of the sword embryo dripped down, and the sword embryo in the air completely disappeared in front of Duan Qing.

Duan Qing opened his mouth slightly, very surprised.

If he hadn't been controlling the sword embryo with the sword control technique at this time, he would not have been able to find the existence of the sword embryo!

The flying sword made of barren stone is actually invisible!

It must be said that this is beyond Duan Qing's expectation.

He Changzai had never mentioned this to him before!

After a little thought, he immediately figured out the reason.

The ten pieces of barren stone he gave to He Changzai were all only the size of a thumb. Even if all ten pieces were used, it is estimated that no decent spiritual treasure could be refined.

When He Changzai used barren stone to refine spiritual treasures, he probably added other materials, so he failed to refine invisible spiritual treasures.

And the sword embryo he is refining now is made of barren stone, without any other material components.

It seems that only pure barren stone can refine invisible spiritual treasures.