People in gray robes are busy walking around here, or transporting goods, or handing over affairs, and there are bursts of tinkling knocks around them, and there is a busy scene everywhere.

Shen Luo had never been to this kind of treasure refining workshop, so he couldn't help but be curious, and he couldn't stop looking around while walking.

It may be that Ma Xiuxiu had already greeted him in advance, and the people in the refining workshop did not stop Shen Luo and the gray-robed man, and let the two of them walk in.

The two of them turned left and right inside, and soon came to a courtyard, in which sat a large black room, with no windows, only a gray-black stone door, protected and even confidential.

The walls of the room were made of a type of black stone, and there were no gaps, as if a single stone had been hollowed out and carved out.

"Shen Gongzi, when I arrived, this house is the refining room... The gray-robed man said.

"What kind of stone is this? It looks special. Shen Luo touched the wall, and the tentacles were unusually cold and smooth, like silk satin, and couldn't help asking.

"This is a black stone, which is extremely strong and has the effect of heat insulation, and it was mined and transported from the far north by the predecessors of the Honkaku. If the refining room is built with ordinary materials, it will not take a few years to be destroyed because it cannot withstand the high temperature. The gray-robed man explained as he took out a silver spirit rune and pressed it on the stone door of the refining room.

A cloud of white light immediately appeared on the surface of the spirit rune, and it melted into it.

A layer of white light appeared on the stone door, but it quickly dissipated, and the door slowly opened.

"Shen Gongzi, please. The gray-robed man entered it with Shen Luo.

The black room has a lot of space, only a dozen zhang square, and there is a large casting stove on one side of the room, and some fiery red charcoal is piled up at the bottom of the furnace that has not yet been extinguished.

Near the casting furnace was a large basket containing fist-sized pieces of special carbonstone with a slight red tinge.

On the wall next to it, there are also two small jars in the shape of gourds, and I don't know what they contain.

In addition to the casting furnace, there is also a large casting table on the other side of the room, equipped with all kinds of tools, such as hammers and pliers.

"Shen is not proficient in refining weapons, how to use the things here, please explain a thing or two. Shen Luo's eyes swept left and right, and soon he had a full view of the situation in the house, and said to the gray-robed man.

"Yes. These are red yuan carbons made of special materials, and the temperature of the flame formed after combustion is much higher than that of ordinary flames. The gray-robed man pointed to the crimson carbon stone in the basket and said.

Shen Luo picked up a piece of carbon stone, looked at it twice, and quickly put it back again.

"These small pots contain fire nitrate, which can further increase the temperature of the furnace fire, and the combination of red yuan carbon and fire nitrate powder has been able to melt most of the spiritual materials, of course, it is still incomparable to the spiritual fire. The gray-robed man removed a small jar from the wall, which contained a dark red powder like grains of sand.

When Shen Luo heard this, he was secretly happy in his heart.

To melt the materials of the Pure Yang Sword Embryo, it didn't take too high a temperature, and the flame of the casting furnace in front of him was enough.

The gray-robed man then explained how to adjust the flame temperature of the casting furnace and the use of various utensils on the casting table.

Shen Luo kept them in mind one by one.

"Does Childe need anything else?" the gray-robed man asked again.

"No, that's enough, I'm going to stay here for a long time, just don't let anyone else come in and disturb me. Shen Luo said.

"Shen Gongzi, don't worry, I will give orders. Never let anyone bother you. The gray-robed man said immediately.

Then, seeing that Shen Luo didn't say anything to him, this person said goodbye and left with interest, and closed the stone door with his hand.

After closing the door, the outside light was completely cut off, but fortunately, a glowing fluorite was installed on the top of the house, which was enough to illuminate the environment.

Shen Luo cleaned the floor of the room, cleared out a flat open space, took out various materials for arranging the magic circle, burned the formation pattern on the ground, and arranged a magic circle.

This magic circle is recorded in the Pure Yang Sword Dictionary and is used to assist in sword refining.

He didn't know much about the magic circle, so when he was in the Longevity Village in the dream realm, in order to take the people of the Longevity Village away, he arranged a magic circle.

The sword refining array in front of him was quite complicated, and Shen Luo's current cultivation was very low, far less than when he was in the Dream Realm Longevity Village, so it took three days to complete the arrangement.

According to the Pure Yang Sword Technique, he inserted more than two dozen pieces of immortal jade into the magic circle, and after carefully checking it to confirm that it was correct, he pinched the trick a little.

The circle immediately emitted a stream of red light, making a roaring sound like a raging wind, and the entire room trembled slightly.

With a happy look on his face, he hurriedly pinched the trick and stopped the operation of the circle.

After arranging the magic circle, Shen Luo came to the casting table, waved his hand and took out many materials for refining the pure yang sword embryo, and put them on it.

Instead of lighting the stove immediately, he began to process the various materials, some cut into small pieces, others ground into powder.

It took most of the day to be busy for Shen Luo to deal with these materials one by one.

After completing the preparations, he breathed a little, and after restoring his essence and energy to his peak, he really began refining the Pure Yang Sword Embryo.

He lit the forging furnace first, took out a three-legged golden furnace, and placed it on top of the fire.

This is a simple refining furnace, which is generally something that only novices can use, Shen Luo does not know the art of refining, and it is enough to use this triangular ding furnace.

Under the flames, the triangular furnace quickly turned dark red, emitting a scorching heat.

He turned over and took a large jade bottle, poured the silver-white liquid contained in it into the Ding Furnace, and then took a piece of fiery red spirit wood, which was the main material for refining the pure Yang Sword Embryo, Huolin Wood, and put it into the Triangle Ding Furnace, urging the furnace to be calcined.

These silvery-white liquids are called Quenching Spirit Dew, which is a kind of spiritual liquid that can refine the impurities in the wood attribute spirit material.

After three or four hours in the blink of an eye, as the temperature inside the triangular ding furnace became higher and higher, most of the quenching spirit dew inside was evaporated, and the residual liquid became viscous, and drops of fiery red mucus appeared on the surface of the fire lin wood, and began to show signs of melting.

When Shen Luo saw this scene, he took the fire powder hanging on the wall and threw it into the fire, which suddenly doubled and continued to calcine.

After another two hours, the fire lin wood finally melted completely, mixed with the quenching dew, and turned into a pure fiery red slime.

And the impurities in the fire lin wood have also been thoroughly refined.

With a wave of his right hand, a stream of mana flew out, enveloping the liquid inside the tripod.

As soon as he pinched the trick, the fiery red liquid flew out of the triangular furnace and landed in a two-foot-long cyan jade stone on the casting table.

There was a sword-shaped groove on the green jade, and the fiery red liquid fell into it, spreading rapidly, and quickly filled the sword-shaped groove.

Leaving the casting furnace, the red liquid quickly solidified and turned into a small dark red sword.