In the room, Zhang Yifeng watched Bai Jingjing go out, and his eyes flashed.

The reason why he wanted to go back with Bai Jingjing was indeed for Bai Jingjing. Because, he always felt that there was something wrong with Bai Jingjing's master. It's just that what the hell is wrong, he can't say, it's just a gut feeling.

This kind of intuition has been there since Bai Jingjing first introduced the teacher. He always felt that the deaths of Bai Jingjing's senior sisters made some sense.

For example, why are all three of them dead, leaving only their master?

Moreover, why did their master set a rule not to go back if they didn't become a martial arts maniac? Is there some trouble in the master's sect, their master deliberately supports them, or is there something else hidden.

Either way, Zhang Yifeng felt that he needed to go back and have a look. That's why he said it was for Bai Jingjing.

Shaking his head, Zhang Yifeng took out the Dan furnace and planned to refine the Dan.

He didn't think about the matter of the Bai Jing Crystal Master Sect for the time being, and he didn't continue to think about what he would do after he promoted his cultivation to a first-generation grandmaster, after all, it was too early to think about this, he was only at the fourth layer of the Qi Refining Period now, and there was still some distance from the Foundation Building Period. Let's wait until the cultivation is promoted to the foundation building period.

The Shengyuan Pill on Zhang Yifeng's body was almost gone, but he didn't refine the Shengyuan Pill first, but took out the materials for refining the Compound Bone Pill. Let's heal Sima Han's legs first.

If Sima Han's leg injury drags on for a long time, it really can't be completely healed, at least not the Bone Restoration Pill.

After Zhang Yifeng took out the Dan furnace, he placed all the medicinal materials he needed in the void.

Red snails, villain grass, broken bone flowers, centennial ivy and other materials, a total of 42 materials.

Zhang Yifeng placed them in turn according to the corresponding amount.

The reason why he is so serious is because the Compound Bone Pill is not an ordinary low-grade pill, but a fifth-order pill!

The division of the level of the pill is based on the curative effect and the cumbersome degree of alchemy. The higher the level of the elixir, not only did it require a higher grade elixir, but the process of alchemy also became more complicated.

If it was Zhang Yifeng in the previous life, he would not frown his brows, and he could easily refine the Compound Bone Pill, but in this life, Zhang Yifeng was still better to be cautious, after all, his cultivation was too low.

Zhang Yifeng only has one copy of the material of the compound bone pill, and he is not allowed to be sloppy.

This time in alchemy, Zhang Yifeng did not cast the Netherworld Ghost Fire, the weaker the cultivation, the more the alchemy could not cast a high-level flame, and if there was a mistake, all the materials could be destroyed!

Zhang Yifeng still cast the Blue Moon Fire, and the blue flame was like a fire dragon pouring into the Dan Furnace.

This is to control the temperature of the Dan furnace first, and after keeping the temperature at a certain temperature, Zhang Yifeng added the first main material, broken bone flower.

In the past, Zhang Yifeng had been refining the Healing Pill and the Returning Qi Pill very quickly, but this time he was cautious, preferring to work slowly and meticulously to successfully refine the Bone Pill.

The Broken Bone Flower entered the Dan Furnace and was immediately wrapped in the Blue Moon Fire, and began to remove impurities.

Broken bones are a special kind of flowers, under the precise control of the temperature, the broken bones are not burned, but slowly melt like ice, forming a viscous liquid, these liquids, there are essence solutions, there are also impurity-rich solutions.

Zhang Yifeng needs to rely on his divine sense, accurately manipulate, and burn the impurities into ashes, leaving only the essence.

This time in alchemy, the Blue Moon Fire burned for half an hour before it completed the work of removing impurities, and the Broken Bone Flower finally turned into a drop of crystal clear solution.

"Villain grass, burn!"

Exhaling a breath, Zhang Yifeng began to smelt the second elixir.

Then the third plant, the fourth plant......

Two hours later, nine drops of solution were suspended in the furnace, like nine stars.

These nine drops of crystal clear solution are the main materials of the Compound Bone Pill.

It took Zhang Yifeng two hours, or four hours, to smelt the nine elixirs. This shows how difficult it is to refine the Compound Bone Pill.

Each of these nine main medicinal herbs has a different temperature for melting and removing impurities, that is to say, in Zhang Yifeng's Dan furnace, there are actually nine local temperatures!

Each of the nine drops of the solution has a different temperature. This requires a lot of control to do this. This is why Zhang Yifeng is cautious.

The fifth-order elixir is not ordinary.

After the main materials melted, Zhang Yifeng finally breathed a sigh of relief, and the next thing was auxiliary materials, and the auxiliary materials were simpler.

An hour later, Zhang Yifeng smelted all the remaining thirty or so auxiliary materials into liquid. And let the liquid of the auxiliary materials fuse with each other.

After a short time, a total of ten drops of liquid appeared in the Dan furnace.

Nine drops of main solution and one drop of auxiliary solution. Although there is only one drop of the auxiliary solution, the size of this drop is two or three times that of the nine drops of the main solution.

Next, there is a very important process of alchemy, fusion!

If the fusion goes wrong, all materials are destroyed.

"Melt!"

With a light drink, Zhang Yifeng released the power of his divine consciousness to the maximum, enveloping ten drops of solution, and causing the ten drops of solution to merge with each other.

Ten drops of the solution approached quickly, touching each other almost simultaneously, then squeezing, compressing, fusing together!

This process may seem simple, but it is actually very complex and not sloppy at all.

The fusion process of these ten drops of solution must be uniform in every part, if there is a certain solution in one place, when condensing Dan, it can cause this part of the solution to become waste residue directly, and the final number of finished Dan is definitely not much.

If the fusion of the whole solution is not uniform! The result is obvious, in the end, only a pile of waste residue will appear, declaring the alchemy a failure.

After fusion, you can condense Dan.

Time passed, and Zhang Yifeng's face turned a little pale, which was the reason why his divine sense was consumed too much.

This is the first time since he was reincarnated and reborn that Zhang Yifeng feels that his divine sense power is not strong. The Compound Bone Pill is indeed worthy of being a fifth-order pill, and apart from him, there is probably no second person on the earth who can refine it.

This elixir not only tests one's skills, but also requires a very high level of divine consciousness.

Because of these ten drops of solution, some solutions will instinctively repel another solution! Like a natural enemy, it is extremely difficult for these mutually exclusive solutions to fuse. If you are not careful, the alchemy will fail.

Fortunately, it was not the first time that Zhang Yifeng had refined the Compound Bone Pill, so he was careful and continued to fuse the solution.

Fusion, slower than removal of impurities.

An hour, two hours......

Soon, four hours passed, and the ten drops of solution were finally completely compatible, and the ten colors of the solution formed a huge mass of solution, which slowly rotated in the Dan furnace, like a ten-colored ball.

Five hours, six hours......

With the passage of time, the color of the ten-color ball is gradually decreasing, and it has become eight colors at this time.

Seven hours...... Eight hours......

The original ten-colored ball has become a seven-colored ball.

This is the process of fusion, when the solution has only one color of uniform partitions, it can be considered completely compatible.