Yu Xing casually handed a middle-grade spirit stone to the big man in charge of the Earth Fire Alchemy Room.

After the big man took this fire attribute spirit stone with a smile, plus Yu Xing, Master Li's identity as a named disciple of Master Li was even more attentive to Yu Xing. He immediately led Yu Xing to the huge multicolored stone gate, and took out a purple arrow-shaped object from his bosom, and aimed it at the stone gate for a moment.

The purple made the red light on the arrow flash, and a ray of glow flew out from it, hitting the door accurately, and immediately making the multicolored streamer turn rapidly. As a result, after a few loud "creaks" and "creaks", the stone door slowly rose, revealing a black passage behind the door. This passage is a few feet high and square in shape.

"Senior brother, after this stone road, it is a room with a fire, let's go over now!" After squeezing out a few smiles, the big man said flatteringly to Yu Xing.

"Hmm!" Yu Xing nodded noncommittally and walked into the passage first.

Yu Xing followed behind the big man, and in the blink of an eye, he passed through two other stone doors that were also tall, and finally walked out of the dock stone passage and appeared in a large rotunda.

This hall is also made of dock stone, but the diameter is forty or fifty zhang, and the height is more than ten zhang. Around the hall, there are more than 30 white stone doors of the same size.

"Below this hall, there is a gathering place where the local fire is most vigorous, so this gate has opened a total of thirty-six ground fire rooms for refining alchemy here, and the best alchemy rooms are the eighteenth and nineteenth.

However, No. 18 has been occupied by a senior uncle, so the junior brother should use room No. 19! Although it is slightly worse than the Eighteenth, its firepower and stability are also excellent. ”

Dahan opened his mouth to explain, quite a feeling of hard work first. As he spoke, he walked towards a door painted with two golden lacquer letters, "Nineteen".

Yu Xing listened without words, nodded silently, and agreed.

Seeing this, the ugly man immediately took out a white jade plaque and pasted it on the door, and the white stone door opened automatically. Then, Dahan and Yu Xing entered the house.

This house is a square building, the area is average, only seven or eight zhang in size, but in the center of the house there is a round dun with a width of a zhang, and there is a fist-sized gourd hanging on each of the four walls, and there is an emerald green futon in the corner of the wall not far away.

Yuandun is also made of dock stone, and is very flat, only half a foot high. But on the outside of Yuandun, there are eight fiery red miniature dragon heads, which are lifelike. Moreover, the mouth of the dragon's head is slightly raised, which is just aimed at the sky above the center of Yuandun, and the spitting posture is very realistic.

Dahan can get such a job with oil and water, he naturally understands the sophistication of human feelings, and before Yu Xing opened his mouth to ask, he began to explain.

"Senior brother, this is the earth fire mouth of this house, and the earth fire needed for alchemy is spewed out from these eight dragon heads. And according to the need, the size and height of the flame can also be adjusted by itself, and the specific driving method is engraved on the outer wall of the stone pier. ”

"In addition, these gourds hanging on the wall are filled with Martian sand, which can temporarily strengthen the power of the earth fire, if the junior brother feels that the temperature of the earth fire is not enough, he can use this to temporarily increase the power, but it will not last too long. In addition, this jade card is put away by the junior disciple himself. As soon as the door was closed, it was cut off from the outside world. Unless it is the joint efforts of several monks of the Yudan period, no one can enter from the outside, so although the junior disciple can rest assured, no one will disturb him! ”

After Dahan finished speaking, he bowed and knew that his task was completed. said that he would not disturb his junior brother's alchemy, and obediently retreated.

Yu Xingmu sent the big man out of the house, so he immediately drove the jade plate and sealed the stone gate again.

What he needs is such a closed environment, after all, what he wants to refine is Tsukidan! After the trip to the forbidden land, all the elixirs in his hands were ripe, enough for alchemy a hundred times.

He also spent a lot of effort, asking some things about alchemy from that Uncle Ma, and he had also refined the holy medicine of the mortal world, but compared with Zhuji Dan, the gap was definitely still very large, so Yu Xing didn't expect him to succeed a few times.

As long as he can refine six or seven Zhuji Dan, it will be enough for him to build the foundation.

The rest of the sentence that was decided was written down, and the method of driving the dragon's head was recorded. Then he pinched the method with his hand, and shot out eight red lights on the dragon's head in a row, and the dragon's head immediately absorbed the red light, and then the dragon's mouth opened slightly, and they spewed out purple flames with the thickness of chopsticks. Suddenly, the air in the room was filled with a scorching heat.

Subsequently, Yu Xing tried to change the thickness of the flames and the height of the dragon's head spray, and other subtle operations, until he was able to manipulate it freely, and then extinguished the dragon's head's ground fire. Then he went to the futon and crossed his knees to recuperate.

Yu Xing sat for most of the day, and after realizing that his mental and physical strength were all in the best condition, he opened his eyes and stood up, ready to start alchemy.

Yu Xing first took out the silver silk tripod he bought that day from the storage bag, and injected a levitation technique on his body, causing it to stop directly above Yuandun out of thin air.

Yu Xing once again shot a red light at the dragon's head, releasing the purple earth fire in the dragon's head.

Because the raw materials have not been put into the ding, the remaining punishment controls the earth fire, making it very small, only as thick as a silk thread. Then let the silver silk tripod start to rotate slowly out of thin air under the preheating of the eight fire lines.

After a quarter of an hour, the silver silk tripod was already hot, exuding an astonishing heat.

Seeing this, Yu Xing pointed at the small tripod, and as a result, the lid of the silver silk tripod immediately flew up, revealing the mouth of the tripod. With a look of his right hand, a white jade bottle appeared in his hand, and the bottle contained a precise amount of elixir powder prepared.

Controlling the vial, Yu Xing poured all the powder in the vial into the silver silk ding, then immediately threw the vial, then took out another bottle from the storage bag, and continued to repeat the same action.

In this way, Yu Xing poured all the dozens of elixir powders needed into the silver silk tripod, and finally closed the lid again. The first step was finally completed, and it seemed perfect and nothing went wrong.

He had already been familiar with these steps more than a dozen times, and the weight of the elixir powder was also clearly written on the scroll, which he had prepared a long time ago.

The purple fire spewed out by the eight dragon heads changed from thin to thick under the manipulation of Yu Xing, and was as thick as a finger, while the speed of the silver silk tripod's rotation gradually slowed down, and began to tremble slightly in the flames.

As time passed, Xiao Ding emitted a hint of medicinal fragrance, which made people feel refreshed. But Yu Xing knew that it was still very early for Cheng Dan at this time, and at least he had to use a more violent earth fire to carry out instantaneous condensing pills, so that it was possible to form a pill.