Inside, the smoke is filled, the heat is steaming, and you can't see your fingers.

It was a room made entirely of stone, but it was more like a large stove, and there was a huge wooden barrel filled with water, and underneath the barrel, in the hollow between the room and the ground, was a furnace, and there was a flame burning, and the flames kept licking the bottom of the barrel, and this barrel was made of ironwood from Junnan Mountain.

Ironwood, as the name suggests, is as hard as iron, and it does not burn when it encounters fire, but it is good at conducting heat, and such a large bucket of water will soon boil, so the room is filled with smoke.

The room was hermetically sealed, with no windows, only a wooden door, and the gap between the wooden door and the door frame was so small that if you passed through the room, you had to pay close attention to see a small amount of smoke coming out.

Outside the house, the banana did not sit on the ground vividly, he was responsible for adding firewood to this huge stove, once the fire inside weakened slightly, it was necessary to put the firewood prepared in advance, this is a simple but boring job, it has been more than an hour, the firewood is burning very fast, so he repeated the action of throwing firewood into the stove dozens of times.

However, there was no boredom or exhaustion on his face.

In the past, he wiped the walls in the Sword Palace, because he knew that the slightest mistake might lead to the loss of his head, so he was very focused on doing things, and once he focused on one thing, he had no distractions.

In the room, in a large steaming wooden barrel, Du Rui was naked, soaked in hot water.

Naturally, the barrel will not be ordinary hot water, and all kinds of precious medicinal materials in it, if converted into silver money, are enough for ordinary people to spend for a year, that is to say, martial arts cultivation is really an extremely money-consuming thing.

The prescription of the medicinal bath is extremely precious, even on the first floor of the library of the Sword Palace, there is no record of the prescription.

Even if there is a prescription, it is not necessarily true, most of the prescriptions recorded in those secret canons often have secrets, one or two key medicinal materials are passed down by word of mouth, and will never be recorded on paper, so that there are many prescriptions lost, only those who have been passed down for thousands of years have completely preserved the secret books and prescriptions.

This is also the reason why the Maison gate lords are able to rule the world, they control the means of production.

In Du Rui's previous life, science and technology were productive forces.

In this world, martial arts is actually a kind of productivity, in addition to being able to kill, it can also produce commercial benefits, for example, on the docks in Wannian County, coolies are basically rough martial arts, so that there is no need for any machinery, no pulleys and the like, just by manpower can move those goods down, and the speed is very fast.

A few hundred catties of goods are enough to have these ordinary martial artists, even if they have not opened up Xiao Zhoutian's inflow of internal martial artists, they can easily carry two or three hundred catties of goods, if it is thousands of catties, or close to ten thousand catties, there are naturally other martial artists to come forward, if the innate master, once the true qi is all stimulated, it is no longer a problem to move tens of thousands of catties.

Of course, if it weren't for the royal family or the first-class gate valve, no one would let the innate master do such a thing, it would be a tyrannical thing.

At this time, machinery such as pulleys or levers came in handy, and it only took a great Zhou Tianquan warrior to easily move 10,000 catties of goods from the ship to the dock.

One more example.

For example, communication, in the ancient times of Du Rui's previous life, it was nothing more than an eight-hundred-mile rush, changing horses without changing people, speeding along the official road, from Lingnan to Chang'an, even if the gallop road was very flat, there were post stations along the way, if you want to send the lychees picked from the trees to Chang'an before they are broken, in fact, it is difficult to do. In the future, with high-speed rail bullet trains or something, it will be different.

And the martial artists of the Shenxing Gate, if the Great Zhou Tian is perfect, galloping with all their might, the speed is the same as that of the EMU, of course, like this, they can support half an hour at most, and after that, they need to spend two hours to meditate and breathe, restore their true qi, and in this way, they can do it again. However, if you don't have to run with all your might, there is no problem with about two hundred miles an hour, and you can run for a day, which is very powerful.

The problem is that among tens of thousands of people, there is often not a single Great Zhou Tian martial artist.

This is due to the fact that the means of production are insufficient.

Cultivating a Great Zhou Heavenly Martial Artist, even if the cultivator himself is talented, requires a lot of resources, and if you want to get these resources, even if you have money, if you don't have connections, you can't do it.

Because, these resources are all in the hands of the family gate valve.

In the past, Du Rui didn't have any cultivation resources.

In a dream-like state, he has a trance-like heart, coupled with a powerful spiritual power, which is the best state for cultivating the Ichthyosaurus Mind Changing Method, so his true qi is like a great river and the sea, and even, there is a trace of innate true qi, this innate true qi is the color of gold, which is very different from other true qi, and is very arrogantly wandering in the sea of dantian qi, like a very small golden dragon.

It seems to have its own spirituality, and it is not affected by Du Rui's thoughts at all, let alone controlled.

Compared to True Qi, Du Rui's body is very bad.

He just ate like a normal person, did not take pills, did not take medicinal baths, and the nutrients he absorbed were also very limited, not only could not provide them to the brain, so that the brain was dormant for a long time, and similarly, the absorbed energy could not meet the needs of the body, and the body was in a state of hunger and thirst for a long time, so he was ten years old, but his body was like a six or seven-year-old child, thin and weak.

If his second personality hadn't awakened more than two months ago, Du Rui would have probably gone with his mother by this time.

Now, things are different.

Almost every once in a while, something is given from the palace.

These items are either from the hands of Yingzong Du Zhen, or from the hands of Empress Guo, and occasionally, Linghu Xingzhi will also send some gifts to the door, like Fan Wuji's father Fan Tong, Zhao Baoyu of the Zhao family and other people who have dealt with Du Rui, will also send a gift to congratulate him on entering the Sword Palace to practice. Most of these gifts were medicinal materials and formulas related to cultivation, and with only a small amount of money, they all knew what Du Rui needed most now.

During this time, Du Rui is like a bamboo shoot in spring, growing taller and taller.

In just two months, with a large number of drugs to nourish, his body shape has changed greatly, and now, he is slightly shorter than his peers, thin or thin, but not weak, no longer like before, as if the wind can blow away.

After opening up Xiao Zhoutian, Du Rui's practice is even more progressive.

Because Tang Tang's innate true qi had traveled once, coupled with the help of that magic elixir, his meridians were very wide and there was no blockage, as long as the amount of true qi was sufficient, he could easily pass through.

Now, basically two or three days can open a meridian.

What he needs is the amount of true qi, there is enough true qi to pass through the meridians, it cannot be cut off, it must be like the continuous Yangtze River, not a stream that is sometimes abundant and sometimes dry.

Therefore, the amount of time Du Rui spends soaking in the medicinal bath has increased every day.

Once he came back from the Sword Palace, he would soak in the medicinal bath in this room all afternoon, and the medicinal materials needed were precious and relatively ordinary, and these medicinal materials were appropriately added and deleted by Du Rui according to the recipes handed down from the palace. In just over two months of study, regarding the medicine of this world, in theory, he has surpassed Xu Xinyan, and is not even under Xu Huanzhi.

Of course, only theoretically.

In terms of implementation, he is still inexperienced.

The medicine of this world, like the Chinese medicine of Du Rui's previous life, is theoretical and empirical, supplemented by theory and empirical.

However, Du Rui can still cure some simple common diseases, although he does not have Yimu True Qi, but the Ichthyosaurus Mind Changing Method can transform any True Qi, Du Rui came into contact with Yimu True Qi through Xu Xinyan, and he was able to simulate it, which is, lack of use of methods, so it is impossible to use Yimu True Qi to treat some rare and difficult diseases.

The medicine is soaked in water, turned into medicinal power in high temperature, penetrates into Du Rui's body little by little through the pores of the skin, and is driven by Du Rui's thoughts, captured by Du Rui's true qi, mixed with the true qi, and enters the dantian qi sea through the meridians, and in the dantian qi sea, it is converted into true qi, of which only thirty percent can be converted into true qi.

The remaining seventy percent of the medicinal power is actually not wasted.

These medicinal powers penetrated into the body, flesh, bones, internal organs, ......

Otherwise, in such a short period of time, Du Rui would not have grown so tall.

At this time, Du Rui's whole body was soaked in water, even his beard and eyebrows were all soaked, and the original black potion gradually turned yellowish-brown, and then, it became milky white, and then it was as transparent as water, which meant that all the medicinal power in the potion was absorbed by him.

Under normal circumstances, martial artists are rarely able to absorb all the medicinal power in the medicinal bath, their mental power is insufficient, and their minds cannot capture all the medicinal power in the potion, and the effect of converting it into true qi is also very poor.

After a bucket of potion was completely turned into water, Du Rui opened his eyes.

He emerged from under the water, his long hair hanging down from his scalp, revealing his little pale face, and he looked up, the smoke still in front of him.

At this time, Du Rui took a deep breath.

It is as if a long whale sucks water, and this breath is so long, almost a stick of incense.

All the smoke was thrown at him, and he swallowed it in one gulp, as if his mouth was a whirlpool, with a great attraction, and with a stick of incense, all the smoke in the stone house disappeared into Du Rui's mouth.

These smokes also contain medicinal power and cannot be wasted.

That's why Du Rui built this room airtight.

Then, he opened his eyes.

At that moment, the eyes seemed to have a sea of stars shining brightly.