After returning to the mountain, Li Yunfei lived a life like an otaku again, in addition to exercising and researching and designing some things every day, most of his spare time was refining Mithril, and several girls who came back after mixing at the bottom of the mountain for half a month came back with some injuries on their bodies, if they wanted to say that there were no dead people, it was just their luck was good.

The battlefield is changing rapidly, and even Li Yunfei himself can't guarantee that he will definitely not be injured, not to mention these subordinates who are stronger than ordinary people, so after seeing those who came back from being injured for the girl, he made up his mind to make a set of battle armor for each person, a Mithril battle armor with a flying function, and a rifle machine gun bullet that can withstand close-range shooting.

The performance of Mithril is very strong, and the Mithril flask of the first test, which is no more than two millimeters thick, was shot by the 38 rifle bullet fired at close range and flew out more than ten meters away, but the Mithril flask was not damaged at all.

It is certain that Mithril is more than 10 times stronger than ordinary carbon steel, and in principle, only 1.5 mm thick Mithril armor is needed to block most rifle bullets.

If you stack a strong formation pattern on the armor to form a protective force field, then it is also possible to resist the attack of anti-materiel weapons, of course, whether it will be damaged by the impact force is another matter, maybe it would be better to add some cushioning material to the inner lining.

The refining of Mithril consumes very spiritual power, with Li Yunfei's spiritual power, he can only refine about ten taels a day, if you want to make a set of Mithril Battle Armor, it may take up to twenty kilograms of Mithril to achieve the desired effect, so this is indeed quite a waste of time.

However, Yichun is always tired of Li Yunfei's side when she has nothing to do, and asks Li Yunfei for advice from time to time, and she unexpectedly grasps the ability of spiritual perception, although the range is only four or five meters around her, she also successfully discovered dark energy, and even successfully refined a gram of Mithril.

"Yichun, you honestly explain, why did you progress so fast, I still don't believe it, you just stay by your eldest brother's side a little longer, and you can improve so much if you ask more!" Seeing that Yichun had successfully refined a gram of silver into Mithril, Yumo really didn't believe that Yichun's talent was so much better than everyone else.

Li Yunfei said that if you want to perceive your divine thoughts, you must at least reach the fourth level of qi training, and now everyone is practicing qi twenty percent, this is still achieved with the help of those elixirs provided by the eldest brother, Yichun has nothing special, Li Yunfei also said that his talent should be the highest, how did this Yichun come from behind?

“…… Sister Yumo, can you not say it! ”

"If you don't think of me as a sister anymore, then don't say it!" Yumo directly said to the general.

"This ...... I'm only going to tell you alone, and you can't tell anyone else, because you really can't let too many people know about this. ”

"Well, you say, I won't tell anyone else if necessary."

"Here's the thing: Once, when the eldest brother fell asleep refining Mithril, I sneaked into the eldest brother's room...... Lying next to him, I habitually meditated before falling asleep, and then I found a very peculiar effect, some of the energy in my body seemed to be absorbed by the eldest brother, and some of the energy in the eldest brother was absorbed by me......"

"And then you run to sleep next to your eldest brother every day?"

"It's not every day, it's just occasionally, and I'm also refining Mithril in order to strengthen my perception ability early, I don't have any selfishness."

"The ghost only believes you, I'll go at night, remember to call me when the time comes!"

"Okay, don't tell anyone else!"

"You know, what should I pay attention to when I go?"

"Big brother, you don't know that person, you just love to be clean, but don't go with the smell of sweat after training, it doesn't matter if you fall asleep, you will be like a wooden man after falling asleep!"

“…… It's also strange, why do people who think that the eldest brother is so powerful, why do they sleep so heavily every time they fall asleep? ”

"Isn't it just right, let's go, let's go, let's train!"

After the two left, Li Yunfei walked out of another room, he didn't mean to eavesdrop, but he really happened to hear the conversation between the two people, and then he discovered the secret.

I didn't pay much attention to the fact that Yichun was quietly lying next to him after he fell asleep. She's right, she's like a log when she falls asleep, and she won't wake up until someone doesn't assassinate her.

It's a little strange that two people can exchange energy when they lie down in everything, could it be that the life magnetic field will automatically complement each other, and automatically complement each other, is this the legendary double cultivation, what will happen if the three people of Yumo come over and lie together?

“…… Forget it, we'll find out what the situation is after careful observation at night. "I don't think about anything, or get the aircraft right first, so that my subordinates are familiar with the feeling of flying, only more flying exercises can improve flying skills as soon as possible, now there are three sets of flight equipment, and it is not convenient for everyone to change training.

……

When night fell, the girls who had undergone a day of intensive training went back to rest early after eating and putting it away, Li Yunfei continued to refine Mithril, since he knew that something might happen at night, so he also left three points of leeway for refining Mithril, and at ten o'clock in the night, he pretended to be very sleepy and went to bed.

Sure enough, more than an hour later, the two arrived as scheduled and sneaked in.

"Big brother is really asleep!" Yumo asked in a low voice, the first time to do this kind of thing, it was really nervous.

"Don't worry, we must be asleep, otherwise our big brother will ask us something." Yichun said with certainty.

After the two glanced at each other, they quickly got into bed, lying next to Li Yunfei on the left and right, originally they wanted to practice as long as they were close to the distance, to reach the distance of the interaction of the life magnetic field, but the two were still habitually close and closer, and finally completely hugged Li Yunfei's body.

"No wonder you like to lie next to your eldest brother, it turns out that your eldest brother's body will exude such energy."

"Actually, I really don't care about those energies, as long as I can lie by my brother's side forever and smell his body more, I'll be satisfied."

"Yichun, you can't be too greedy, big brother still has to have his own life after all. We don't deserve it! ”

“…… You know, that's all I said, but I'm already satisfied. ”

"Well, it's good to understand, let's start meditating and improve our strength as soon as possible."

After chatting for a few words, the two finally stopped talking and began to exercise the meditation technique taught by Li Yunfei, Li Yunfei also expanded his spiritual perception, carefully observing the changes in the bodies of the three people.

Under the perception, the life magnetic field of the two people was quite vigorous, radiating several meters, Yumo's life field reached two meters away, and Yichun's life magnetic field reached four meters away.

The three people's life magnetic fields interfered with each other, and it didn't take long for a larger life field to be formed, communicating with each other, and observing for more than half an hour, the effect was indeed there, Li Yunfei also felt that his life magnetic field had increased a little bit of strength, although it was insignificant, but it did improve a little, and the two girls benefited a lot, especially Yumo, after practicing once, the strength of her life magnetic field actually increased by one-tenth.

The range of action of the life magnetic field of a normal person will only be within a few centimeters outside the skin, and the range of the life magnetic field of a person with a stronger body will reach more than ten centimeters, while a cultivator who begins to cultivate a trace of true qi will have a life magnetic field that is several times stronger, reaching dozens of centimeters.

In principle, the first layer of Qi training, the range of action of the life magnetic field will reach more than one meter, and the second layer of Qi training will be more than two meters, of course, this is only an approximate data, and the recent width varies from person to person.

In some respects, the perception of divine thoughts is actually based on the help of these diffused life magnetic fields to form a range of field loop perception.