The following is the work of fusing and compressing these kinds of aura that complement each other. Tian Xu carefully controlled his aura output, mixing and compressing these kinds of aura according to a method similar to Ning Dan.

At the same time of compression, the formation in the Nine Xuan Furnace was operated to absorb the aura from the surrounding environment and integrate it into the aura of the elixir, and at the same time compress. When the aura absorbed from the outside world reached three times that of the aura in the elixir, Tian Xu didn't dare to absorb it anymore, the more aura he absorbed, the more difficult it was to control, and the higher the probability of failure.

After the aura compression was completed, Tian Xu tried to guide the compressed aura into the long groove above the Dan furnace. Here, the aura will be automatically divided into appropriate sizes, and the formations will be constructed separately to form pills one by one.

However, at this last step, something went wrong. He could feel that the compressed aura had been split into seven parts, and he could also feel the process of building the formation of the Dan Furnace, but at the beginning, this formation could not be combined with the compressed aura, that is, there was no way to condense into one pill.

As time slowly passed, in order to control these auras, Tian Xu output more and more aura, and gradually felt tired, but he was still unable to condense the elixir. The compressed aura is not stable, and once it gets out of control, it may burst out all at once, and that is the legendary fryer.

Fortunately, the total amount of these auras is not much, and it is still within the range of his control. With no choice, Tian Xu had no choice but to control a stream of aura to open the lid of the Nine Xuan Furnace, allowing those compressed aura to burst out.

Under his suppression, the burst of aura only made a soft "snap" sound, and then disappeared without a trace. Most of the aura that erupted was absorbed by Tian Xu to make up for the aura he spent on alchemy. But it was still not enough to compensate him for what he had paid.

"Hey, it's a big loss. Tian Xu couldn't help but sigh.

He sat on the ground with his ass, holding the Nine Xuan Furnace and thinking about the reason for the failure repeatedly, but he couldn't figure it out, and all the operations seemed to be fine.

He turned around and thought through all the details of the pill recipe and the common sense of alchemy, but he still had no clue. After thinking about it for a long time, he finally boiled down the problem to the formation constructed by the Nine Xuan Furnace, was it not the right formation? But he really didn't know anything about the formation, and he couldn't understand whether it was a formation or not, so the matter was still unsolved.

Later, he doubted his own operation, prepared another elixir, and tried again, but as expected, he still couldn't condense the pill.

Tian Xu couldn't find the problem for a while, so he compared his experience in condensing pills, hoping to find the abnormalities in the alchemy process. After thinking about it for a while, I didn't expect the anomaly of alchemy, but I found a new way to play: if you can control the aura to compress it from a distance, or use the aura to control the air for compression, and then suddenly release the suppression, it can have an effect similar to that of a hand. If you can hide the traces of control, the lethality of this move is quite large, at least for Ning Dan Realm cultivators, it is still a threat.

After a while, Tian Xu reacted, as if he was off topic. However, he was still very happy to think of a possible method of using aura, which could be regarded as a lost harvest.

Returning to the issue of alchemy, Tian Xu changed his way of thinking. He took out all the pills he had bought and examined them one by one, observing the difference between these pills and the pills he hadn't refined. I finally made some discoveries, but I couldn't find the problem for a while. The feeling of being missing only a layer of window paper made him a little irritable.

He took out a piece of jade honey from the space and threw it into his mouth. The unique sweetness of Yufeng honey with a hint of fragrance spread in his mouth, and he quickly swallowed it into his stomach. When he opened his mouth to spit out the rest of the hive, he finally realized what the problem was.

The honeycomb is an impurity for honey, but without the support of the honeycomb, the liquid honey will not be able to form and will flow everywhere. The pills he bought back had medicinal residues in them, and the compressed aura in the pills existed in this residue. And those formations that cannot be seen or touched are also built on these medicinal residues.

Although the aura is compressed, it is still not an entity, but only an abstract existence, and when he was alchemy, he completely extracted the aura from the dregs, and it was pure, but it also made the formation that also belonged to the abstract existence nowhere to stay. In this case, it is reasonable that the elixir cannot be condensed.

Thinking about this problem, Tian Xu was open-minded, prepared a new elixir casually, rehearsed the adjusted alchemy process in his heart, and after finding that there was nothing wrong, he immediately started the third alchemy.

It seemed that in the blink of an eye, one step after another was completed under Tian Xu's control, and soon came to the final Ning Dan step.

Prior to this, he had already crushed the dregs of the elixir and put them into the dan trough above the Nine Xuan Furnace, and adjusted the water content of the dregs to a level that was convenient for fusion.

At this time, as soon as the compressed aura entered the Dan trough, it fused with the medicinal residue of the same origin, and naturally divided into nine parts, forming nine round medicine balls.

Under the urging of Tian Xu's aura, the Nine Xuan Furnace quickly constructed a set of formations to suppress the aura, and then divided into nine and landed on the blanks of the nine pills.

With the blessing of the formation, the nine pills rotated dripping in the drum, slowly stabilizing. Tian Xu's nervous mood was relaxed, knowing that this time he finally succeeded. He opened the lid of the Nine Xuan Furnace and took out the nine Qi Replenishing Pills that had just been refined from it one by one to check them, and found that the Dan body was round and smooth, each one was the size of a soybean, and the color was golden with a slight reddish, which was more than a step better than the black Qi Replenishing Pill he bought from Shennongmen.

Tian Xu took out one and threw it into his mouth, the pill melted in his mouth, turning into a rich and pure aura in his mouth, spreading to the limbs and hundreds of remains, and even the dregs melted along with the aura, leaving no slag behind.

Tian Xu used the identification technique to observe the grades of these Qi Replenishing Pills and jumped into his mind:

Qi Replenishing Pill, a first-class super product, replenishes the lack of cultivation aura, and can be used in all realms.

"Damn! It turned out to be a super product, and now it is developed. "Tian Xu is overjoyed, this super elixir, no matter what level it is, is a rare thing. The first time he tried his hand, he refined a super-grade elixir, so it was no wonder that he was excited. The Qi Replenishing Pill he bought from Shennongmen was barely a medium grade.