Chen Yu needs to cross the black mud swamp to reach his destination, the area of the black mud swamp is not small, and there are many special medicinal herbs, flowers and plants. Chen Yu was in a hurry, while expanding the species for his own space, but it did not seem boring.

When passing through the swamp, Chen Yu found a lot of fish, medicinal herbs and other things, as well as some ores, the black mud swamp has a vast area, although it looks desolate, but the products are still very rich, along the way Chen Yu tasted a lot of novel ingredients, after some experience, the cooking skills are better.

However, the black mud swamp is also a dangerous place, in addition to the swamp that can devour people at any time, there are some miasma that need to be paid attention to, and there are also some poisonous insects, etc., Chen Yu can't fly in the sky all day long, and he also needs to land to rest, so he has always been more careful.

Now that Chen Yu has seen a lot of new medicinal materials and studied the medicinal properties, his medical skills are naturally more exquisite, and even his understanding of pharmacology is advancing by leaps and bounds.

Of course, there are no beasts in the swamp, Chen Yu also saw a lot of reptilian beasts, but these beasts don't look like good ingredients, so Chen Yu didn't care about it at all, and left directly. Ordinary people probably don't have the ability to pass through such a swampy place, and it's no wonder that Chen Yu hasn't encountered anyone for so long.

Even in modern times, with high technology, it is unlikely that anyone will set foot in such a dangerous place, let alone the current world.

A week later, Chen Yu arrived at the edge of the black mud swamp, which already bordered some mountain ranges, and Chen Yu's destination was only a day or two away, I don't know if I would disappoint myself this time, after all, a suitable place is very difficult to find, Chen Yu is not very sure, but if you don't take a look, you must not know. Even if it is not suitable, it would be good to go to another place, anyway, Chen Yu's subordinates found dozens of possible places at once, and there was no need to rush to find it slowly.

However, the volcano here is very active. Therefore, there are no people living around at all, and the volcano is not high, the entire summit of the mountain is bare because the volcano has only erupted not long ago, and Chen Yu flew directly to the top of the mountain. Before it falls to the ground, you can feel the heat on the ground, and this has not yet reached the crater, it seems that this volcano is really active, but I don't know if it is suitable for my own alchemy.

Chen Yu didn't know whether he hoped to be suitable or not suitable, after all, if it was suitable, but this volcano was too active, and it wouldn't take long, if it wasn't. Then it's a trip for nothing, it's really tangled.

Chen Yu came to the crater and scanned it, and he could see that the magma under the crater was boiling, and it looked very hot.

But can you dig a cave under the fire to make alchemy? The temperature is suitable, but there are no ready-made caves, but if you want a cave, it is not difficult to dig one out of the crater by yourself in this terrain. After all, Chen Yu's strength is there, and it is not given for nothing.

However, it depends on whether it is cost-effective or not, and this volcano may only erupt for about ten years, although it has only erupted once before. But it only lasts a few years. It's just that if you give up here, I don't know if you can find a suitable one, and Chen Yu can't make up his mind for a while.

However, Chen Yu actually wanted to go to other places to see, after all, the gains along the way were not small, and Chen Yu didn't want to spend more time here, so he decided to take a look again. However, Chen Yu still left a mark here, and he really didn't find a suitable one at that time, so he didn't have to spend much effort to teleport here.

Now that he has made up his mind, then Chen Yu will not delay here for long, but he can use the temperature of the magma here to refine the Dan furnace first, the temperature of this magma is very high, Chen Yu wrapped the required mineral materials with spiritual power and put them into the magma, the spiritual power only wrapped the mineral materials, and could not isolate the temperature, so soon a large pile of mineral materials prepared by Chen Yu had begun to melt.

However, Chen Yu was not idle, but constantly removed the impurities in the mineral materials, and slowly, the materials wrapped in spiritual power became more and more refined. It became a large puddle of metal liquid, and at this time, Chen Yu added some materials and continued to purify, and slowly the entire metal liquid changed color and became more shiny.

Chen Yu thought about the structure of the Dan furnace, and then began to plasticize this mass of metal liquid according to the structure of the Dan furnace, because it all relied on spiritual power, so this mass of metal liquid naturally became the appearance of the Dan furnace according to Chen Yu's meaning.

Now I just waited for the Dan furnace to cool down slowly, but before that, Chen Yu also carved some formations in it, these formations are not complicated formations, and they are also mentioned in alchemy, after all, alchemy naturally needs to have an understanding of the Dan furnace, and it is in this way that Chen Yu can refine a qualified Dan furnace.

However, it was not an easy task to carve the formation, and it took Chen Yu half a day to depict the entire Dan furnace formation. It is also because the Dan furnace has not completely cooled down at this time, otherwise it will be even more troublesome to portray.

After all, the temperature inside the crater is too high, and the cooling time of the Dan furnace takes too long, but Chen Yu did not use radical means to cool it, which will reduce the quality of the Dan furnace, after all, the Dan furnace will be tested by earth fire in the future, so the refined Dan furnace, even if it falls into the magma in the future, it is not so easy to be melted, that is the effect of some formations, otherwise you can make a look of goods casually, It was impossible to refine the elixir.

After all, the temperature required for refining the pill is very high, if it is an ordinary product, it must be that the pill has not come out yet, and the pill furnace will be scrapped. However, at this time, Chen Yu did not have any refining skills, and the refined Dan furnace could only be regarded as a low-level Dan furnace that had just qualified.

However, at this time, the Dan furnace was enough, Chen Yu waited until the Dan furnace was completely completed, then put away the Dan furnace and flew directly to another suspected volcanic place, hoping to find a suitable location for alchemy there.

Of course, the location of the next place is not too far, that is, it is only half a day's journey, Chen Yu flew for half a day, landed steadily, and looked at this suspected volcano. (To be continued.) )