Tian Xu quickly denied his unreliable idea: "It's definitely not like this." Shennongmen must have a particularly simple alchemy method, which can be used to make alchemy disciples who don't understand the formation method, or even have no condensation pill at all, through specific equipment or methods. These methods may only be able to refine some simple low-level ordinary pills through inherent procedures, and it is very likely that they do not understand the basic principles of alchemy at all. In other words, if these people left the unique equipment or formation of Shennongmen, they would not be able to refine the elixir on their own.

This discovery seemed to open a door to a shortcut in front of Tian Xu. Tian Xu took out the Jiuxuan furnace bought from the bazaar, carefully observed the structure of this Dan furnace, and found that the Dan furnace was a simple metal container, with three short feet in the lower part, the furnace body was round, the top was covered, and the volume was much smaller than that of the Yin Yang Ding, with a diameter of only a dozen centimeters.

There are two round holes about three centimeters in diameter in the upper middle part of the furnace body, and I don't know what they are used for. Between the two round holes, there is the word "Jiuxuan" in Yangwen inscription, which should be the origin of the name of this furnace "Jiuxuan furnace".

The inside of the furnace body is not a uniform space, there are small blind holes along the inner circumference, arranged densely, dozens of them in total, and there is a large long groove in the upper part of the furnace body, which surrounds the upper part of the furnace wall more than half a circle, I don't know what it is for.

On the inner and outer walls of the furnace, there are complex and strange patterns, Tian Xu guessed that this should be some formation runes, but unfortunately he can't understand it at all.

Tian Xu tried to probe the aura into the Nine Xuan Furnace, and immediately felt the existence of the formation in this furnace. These formations are quite complex, dividing the space inside the furnace into zones that seem to be related to the various small holes in the furnace body. There are also passages through which certain auras can pass through the independent interior spaces, like a labyrinth. When he tried to withdraw the aura that had penetrated into the furnace, he found that it was imprisoned in the furnace and could not be recovered.

He simply pushed the aura around the furnace, and eventually the aura reached the long groove in the upper part, and then he retrieved it from the lid on the top of the furnace.

Tian Xu seemed to understand the operation method of the Nine Xuan Furnace, which should be to squeeze the spiritual energy in the elixir in a certain order, and compress the squeezed spiritual energy under the action of the formation in the furnace, and use a method similar to Ning Dan to compress the spiritual energy in the refined elixir, and then build a formation on the elixir to maintain the stability of the aura in the elixir.

The more advanced elixir is under the joint action of the elixir and the formation in the furnace, absorbing the aura in the surrounding environment at the same time and compressing it in the elixir.

If his judgment was correct, then the process of alchemy was actually the process of squeezing and absorbing the aura and compressing the aura, and finally constructing a formation to maintain the stability of the aura that was compressed in the elixir.

Tian Xu took out the pills he bought in the bazaar, studied them one by one, and found that his judgment should be roughly right, these pills all used a certain formation to suppress the aura inside the pill. He tried to use the aura to test the formations in the elixir, some formations were stimulated by the aura, and the aura stored inside burst out, while the aura in some elixirs was not simply released, but slowly released according to a certain speed or order, which should be caused by the different formations that suppressed the aura.

Tian Xu felt that he had basically figured out the principle of alchemy, but he still hadn't figured out what kind of flame the Dan fire was and how it was used.

He estimated that this Dan Huo should be an external energy, and the alchemist would input energy to the Dan Furnace through the Dan Fire, and promote the formation in the Dan Furnace to operate according to certain laws, so as to achieve the purpose of squeezing and absorbing the spiritual energy, as well as compressing and storing the spiritual energy, and complete the process of alchemy.

According to his understanding of compressed aura, in order to maintain the stability of the reich after being compressed, it should require a relatively large amount of force to achieve it. This Danhuo should be the driving force behind this power.

In this way, in order to promote the work of the Dan furnace, it is not necessary to use an external flame to achieve it. If he used his own aura as a power source, he should be able to complete the work of alchemy. I just don't know how much energy is needed for this process, and if his aura will be able to meet his needs.

Tian Xu had a complete pill recipe in his mind, including the operation method, and it could be said that he already had the ability to alchemy. He has now condensed the pill and basically mastered the law of compressing the aura, as long as he masters the correct operation method, he may be able to try alchemy.

Thinking about it a thousand times, it is better to try it again, Tian Xu selected it from the "Commonly Used Dan Formula", and finally chose a very simple primary qi replenishing pill for trial.

This primary qi replenishing pill is a level 1 mid-grade pill, and its function is to be used as an energy source during cultivation, which can make up for the lack of aura in the environment. The way to release the aura is also relatively simple, that is, to stimulate the outer skin of the elixir with external force or aura, and the aura inside can be released at one time for the cultivator to absorb. It can be swallowed directly into the stomach or absorbed after release outside the body.

The materials of this Qi Replenishing Pill are relatively casual, as long as there is a secular medium-grade elixir as the main medicine, and then it is combined with several ordinary medicines that complement each other with the five elements, it can be refined. It's just that because of the different characteristics of the main medicine, the properties of the refined pill are slightly different. There is also the difference in compatibility, which will affect the proportion of the elixir to absorb the aura in the environment, that is, it will affect the efficiency of alchemy.

However, the factors that can affect the efficiency of alchemy are not only the variety of raw materials, but also the skills of the alchemist and the performance of the Dan furnace.

Tian Xu tried alchemy for the first time, and he didn't deliberately think about efficiency or anything like that, what he wanted was to successfully complete the process of this first alchemy, and being able to refine a qualified pill was victory.

The main drug of this experiment is the common Cordyceps that he has at hand, and the compatibility of medicinal materials is something he has been good at for a long time.

After familiarizing himself with the Dan Fang several times again, and firmly remembering the operation essentials of each step, Tian Xu put the main herb Cordyceps into the Dan furnace, and operated the spiritual energy in the body to enter the Dan furnace, trying to urge the formation in the furnace to squeeze the spiritual energy in the Cordyceps.

The Dan furnace extracts the spiritual energy from the elixir, which is almost its most basic function, and it is quite easy to achieve. The squeezed spiritual energy was enclosed in a "honeycomb" lattice by the formation in the Dan furnace, and the first part of the work was completed quite smoothly.

Subsequently, several excipients also completed the extraction of aura one by one.