My sister is the daughter of destiny

"There is one last thing. Master Ning Baichi wants to see you, sir."

"cousin?"

When Lu Ningfeng heard this, his eyes suddenly lit up.

Ning Baichi’s laboratory was built in a large mansion in the core area of ​​Lucheng.

With Lu Ningfeng's warrant, it's just a house, so it can be easily approved.

As for why Ning Baichi did not choose to enter the Lu family's ancestral land and live in Ning Dao Palace, the explanation he gave was that the ancestral land was sparsely populated and not very interesting, and purchasing experimental equipment was a hassle.

"Greetings, sir and lady."

Guarding the door of the mansion were naturally the security personnel from the Fengying Realm Shadow Guard Division. Although the probability of problems occurring in the core area of ​​Lucheng was extremely small, visible guarding was essential.

As soon as Lu Ningfeng and his group walked into the mansion, they heard Ning Baichi's noisy voice.

"Here! This is the 40, 21 position! Oh, how could I be so stupid?"

"Hey! Over there, your side is wrong, move half a foot to the right!"

"I am really impressed. How can there be such stupid people? No, I need Lao Liu to replace me with another group of people!"

Hearing Ning Baichi's scolding, Lu Ningfeng and his group looked at each other in bewilderment.

Is this person always this grumpy?

There was an obvious hint of doubt in Xiaoxue's big eyes.

Lu Ningfeng waved his hand, looking like he knew nothing.

"This guy... is a little... the kids all say he likes to curse when he's working, but he's fine outside of work..."

Liuzi thought about it and explained it relatively tactfully.

In fact, the girls and boys sent here have been carefully selected by the clan and are talented in becoming formation masters or weapon refiners.

It’s just that both of these secondary professions are cultivated by knocking on spirit stones.

The Fengying clan naturally did not have so many resources to waste, so they learned some theoretical knowledge at most. If they put it into practice as assistants to Lord Ning Baichi, it was inevitable that some mistakes would be made.

Fortunately, these little ones are very competitive. Although they have been scolded a lot, they just complain to themselves but have never given up.

Lu Ningfeng didn't know whether to laugh or cry. As a researcher, it was normal to have some weird tempers.

"Cousin, I'm out!"

Lu Ningfeng took the lead and walked towards Ning Baichi who was shouting, and shouted loudly.

Behind him followed Xiaoxue, Liuzi, and Mengyan and Mengyao, the two big sisters of Fengling.

Since the Young Master and Young Mistress had both come out of retreat, they naturally had to follow them, not to mention that Feng Ling now also needed to manage the financial affairs for the Young Master and Young Mistress.

Finding Ning Baichi now is the first step in management. This is the young master’s first investment, and their task is to start counting from here.

"What's that weird accent of yours?"

When Ning Baichi saw Lu Ningfeng, he was a little confused by his accent at first, but then he realized what was going on and rushed over, shouting excitedly.

"Success! I succeeded! I can really achieve low-cost sound transmission! One low-grade spirit stone is enough to support continuous sound transmission for an hour!"

Lu Ningfeng first looked at Xiaoxue, and sure enough, they both saw surprise in each other's eyes.

The brother and sister know best how much benefit this thing can bring.

"One hour with a low-grade spirit stone? Have you ever measured the best distance a low-grade spirit stone can transmit sound?"

As a means of communication, a voice transmission device cannot just consider low cost, but also needs to consider its practicality. If it can only transmit sound face to face for one hour, what's the point?

"Of course, my invention must be a masterpiece. It will never pass without going through layers of tests. This sound transmission spiritual tool uses a low-grade spiritual stone, which is enough to transmit sound within a hundred miles for an hour, allowing for barrier-free communication!"

Ning Baichi smiled confidently.

Lu Ningfeng and his sister were really surprised.

You must know that the most popular means of communication nowadays is the communication jade slip.

Although this thing can transmit sound over a distance of thousands of miles, its consumption of the user's spiritual power increases rapidly as the transmission distance increases, and is enough to drain up to 30% of the spiritual power of a Soul Realm cultivator.

In other words, a cultivator in the Soul Realm can only communicate three times at the longest distance before his spiritual power is exhausted. Moreover, no matter what the content of the communication is, each communication will consume this much spiritual power.

If you use spirit stones to recover, it won’t be as simple as one or two low-grade spirit stones.

Therefore, messages that travel thousands of miles must have someone responsible for the transfer, which creates insecurity as the content of the message will be handled by others.

Expensive and not safe.

This is also the reason why Lu Ningfeng asked Liuzi to make a trip every time he wanted to send a message to Xiaoxue at the Su family.

All these factors have led to a very closed exchange of information between the eight regions of the Tianlan Realm and the Tianxu battlefield.

Many cities in the major domains can still be connected to different surrounding cities through teleportation arrays, and at most they will have to transfer a few times. However, once it involves cross-domain travel, the cost will be quite high.

Or you can queue up in the main city of a domain and wait for enough people to be teleported there at once, which will charge a lower fee.

Or, you can pay for the transmission fee with your own spirit stones, which are basically based on high-quality spirit stones.

"How about it, Sister Mengyan, Sister Mengyao, what do you think of this thing?"

Lu Ningfeng turned around and looked at the two newly hired "assistants", and had the idea of ​​testing them.

"If this thing can communicate without obstacles within a hundred miles, I think it will be more useful on the battlefield."

Meng Yan smiled charmingly. She had been on the battlefield and knew that the situation on the battlefield could change rapidly.

The message from the jade slip needs the receiver to take it out and use his spiritual sense to check it in order to see the message. However, if this so-called spiritual device for sound transmission can be worn on the body for barrier-free communication, it will definitely have a major impact on the form of war.

"One low-grade spirit stone, one hour, one hundred miles, is indeed a very cheap price, but our Lu family already has bases in all the major cities in the Heavenly Domain. Even in other major domains, there are people from our Lu family in the main cities, which seems to be of little use to us."

Mengyao is more concerned about its usefulness in life.

"unless……"

"Unless there is some way to transfer," Lu Ningfeng expressed her thoughts for her.

"Good! Very good! It seems that my cousin is surrounded by many talented people, hahahaha," Ning Baichi burst into laughter after listening to the conversation between several people.

"Transmitting sound within a hundred miles is the limit of a pair of matching sound transmission spirit instruments."

Ning Baichi took out two small objects that looked a bit strange, like a small hook.

He handed the two items to Lu Ningfeng and said with a smile, "This is a pair of sound transmission instruments. I combined the receiving instrument with the sound-generating instrument, and also tried to make them as small as possible so that they can be carried easily. Therefore, their maximum range is one hundred miles. Any more will consume too much energy and it's not worth it."

"But the limit of my method of transmitting sound through space ripples is not here," Ning Baichi said as he pulled Lu Ningfeng to the other side of the square.

There was a metal object here that was about ten feet long, wide and high. It was hollow inside, and there was a crystal about ten feet in size fixed inside it. A faint light was flickering in the crystal.

"Is this... a space crystal?" Meng Yan asked curiously.

"Space crystals are much more expensive, and that one is too expensive. Such a large piece of space crystal costs 10,000 high-grade spirit stones."

This is the space crystal fragment I made. By using ordinary crystal to engrave the space formation, it can gather some space power. "

"Although it cannot be used to refine weapons or set up formations, it can use the spatial force inside to spread spatial ripples! This piece is worth at most the labor cost of a high-quality spirit stone."

Ning Baichi smiled very happily. Today his vanity was greatly satisfied.

If you invent something awesome and don't show it off to others, it's like walking in the night in fancy clothes.

"You said that this space crystal fragment can spread space ripples, so this is your method of transfer?"

Lu Ningfeng understood the purpose of this thing, and the way he looked at Ning Baichi was more like he was looking at a piece of unpolished jade.

This guy has something.

"Hey, let me show you how to do it."

Ning Baichi kept the secret, he took out another hook-like spiritual tool for transmitting sound from his pocket and hung it directly on his ear.

It can actually make fine adjustments, automatically adjusting to the right degree so that it fits just right on the back of the ear.

Then Ning Baichi reached out and pressed a small protruding button on the hook. Everyone only felt that an extremely weak spiritual power began to circulate in it, which flashed away.

"Chen Shi, Chen Shi, I heard a squeak."

Ning Baichi shouted calmly.

Not long after, everyone clearly felt that the sound transmission device on Ning Baichi's ear began to emit spiritual power again. Ning Baichi moved his mind slightly and spread the sound he heard.

"...until...I can hear you...Mr. Ning, please give me your instructions."

"Report your current location."

"I just left Maple Leaf City, and I'm still about thirty miles away from the next hundred-mile area."

Chen Shi's voice sounded again.

"Maple Leaf City? Isn't that a city more than 300 miles away?" Liuzi was most familiar with these and said it immediately.

"To be exact, it should be three hundred and seventy miles. Chen Shi reports every hundred miles he flies. We have conducted many experiments. As long as it is within a thousand miles covered by this piece of space crystal, the matching sound transmission magic device can basically achieve barrier-free communication," Ning Baichi said with a proud smile.

"Thousands of miles? What about the consumption?" Lu Ningfeng raised his eyebrows. If the consumption is not high within a radius of a thousand miles, then basically every city can build one of these transfer devices to achieve network coverage of the entire Tianlan Realm.

This is equivalent to satellite communication on the blue planet.

"One top-grade spirit stone, one day," Ning Baichi paused and kept it a secret. Sure enough, he saw that Lu Ningfeng and the others all frowned slightly.

Then he pointed at the space crystal fragments and said with a smile: "This is the consumption of this big guy. One high-grade spirit stone a day is used to maintain the operation of the space formation inside and the reception and transmission of space ripples."

"As for the sound transmission spiritual tool itself, as long as it is within a thousand miles of this big guy, it can communicate for an hour with a low-grade spiritual stone."

This time everyone was shocked.

Even though Meng Yan and Meng Yao didn't understand the principles behind this thing, they could understand its value.

One space crystal fragment can cover a thousand miles, so what if there are more? Wouldn't it be possible to communicate directly across tens of thousands of miles? (ps: fantasy setting, don't argue, just think of this space ripple as space teleportation, without considering the delay, hehe)

Lu Ningfeng looked at Xiaoxue, and they smiled at each other. They finally had a way of communicating that they were accustomed to, which was not much different from making phone calls on Blue Star.

In time, if my cousin can make it capable of communicating with different people, it will be just like a telephone.

This is an epoch-making invention!