Wang Fan didn't stay, and after meeting with his apprentices and grandchildren, he hurriedly returned to his meditation room, calling the system, the interdimensional sound transmission equipment that Wang Fan needed was still solved by the system that had traveled through countless universes, after all, although Wang Fan's current strength was enough to dominate one side, but such a black technology and black magic thing Wang Fan said that he really couldn't create it!

Therefore, after Wang Fan and the system entered the meditation room, they immediately sealed the penultimate floor of the underground where they were located with the magic array layer by layer (Wang Fan's mage tower has 6 floors above ground and 9 floors underground, of which the 9th floor is where the Dark Gate is located)

Immediately, Wang Fan immediately asked the system if there was such a thing, after all, no one could stand being a "deaf and blind" for a year, think about the environment that was almost isolated from the world, although it was conducive to cultivation, but Wang Fan was not an autistic person, he needed a popular life, and he was not a saint who took the ruthless way, so Wang Fan would rather practice slower than become withdrawn because of this, this kind of life is very bad to think about, you must know that it is very tiring and tiring to have a face every day!

And the system really did not disappoint Wang Fan, it is worthy of the existence of countless universes that have traveled proudly, and soon a large number of options appeared in front of Wang Fan's eyes, including not only the transmission notes of the Xiuzhen universe, the transmission of sound jade, but also the cross-galaxy holographic projection communicator of the technology universe, the interdimensional information transmitter of the magic universe, and so on

And Wang Fan finally chose the sound transmission jade slip of the Xiuzhen universe, although this thing seems to be completely not as tall as the communicator of the technology universe, nor does it have the splendor of the magic universe, if you only look at the appearance, the sound transmission jade slip is actually just a palm-sized jade, and it is still that kind of unpretentious jade.

And the reason why Wang Fan chose the Transsonic Jade Jane is not because Wang Fan prefers things in the cultivation universe, but because the realistic environment makes Wang Fan have to choose the easiest one to make, after all, think about the countless metal components and electronic components of the communicator of the science and technology universe, Wang Fan's head is as big as a bucket, not to mention the difficulty of manufacturing this thing, it is very troublesome to use alone, and it is also very delicate, if it is not good, it will be troublesome, after all, Wang Fan will popularize this thing in the future, not use it alone, don't want to use this thing without strong scientific and technological strength！

And the magic universe is the same, but the magic universe is a matter of cost, the sound transmission jade is used in ten thousand years of warm jade, other places Wang Fan doesn't know, after all, he has not ordered to mine jade ore, but in the northern mountains of the desolate beast plane, there is a large amount of exposed Wen jade on the side that connects to the earth element plane, not to mention ten thousand years, even if it is a hundred thousand years and millions of years, it is also thanks to the fact that it is the early stage of magic civilization, otherwise where would there be such a commanded resource!

The interdimensional launcher, on the other hand, is troublesome, not only does it require more than a dozen materials, but there are also some of them that Wang Fan can't obtain at all, such as the special soul stone in the abyss!

Thinking about the few demon lords in the abyss whose strength is comparable to that of the middle gods, Wang Fan definitely doesn't want to provoke the abyss now, after all, it's too late to hide!

Therefore, Wang Fan finally chose a sound transmission jade slip with a stronger function than the transmission note, although it cannot form a holographic image like the technological universe, but it is definitely enough for Wang Fan, after all, Wang Fan only needs to be able to maintain communication.

Soon a drawing and a palm-sized jade plate fell into Wang Fan's hands, of which the jade plate was a physical transmission jade slip for Wang Fan to observe, and the drawing was the manufacturing drawing of the transmission jade slip, these two things cost Wang Fan a total of 7 million gold coins, of which 200,000 gold coins were used on the sound transmission jade slip, and the other 6.8 million gold coins were the price of the drawings.

Don't look at the drawings cost a lot of gold coins, but Wang Fan still thinks it's worth it, although a roll of drawings can buy more than 30 physical transmission jade slips, but Wang Fan still chose to buy drawings, maybe this will be very time-consuming and laborious, and the physical objects produced may not be systematically good, but Wang Fan still did this, just because he firmly believes that only what he has mastered is the best, as for buying? Think about the misery of modern China, you will understand the sadness of a country that cannot produce its own weapons and equipment.

Therefore, even if he would experience a lot of failures, Wang Fan still chose the most complicated and troublesome way to start making the sound transmission jade slip, fortunately, the place where Wang Fan was located was the meditation room on the eighth floor of the underground, which was super close to the ninth underground layer that could lead to the dark door, so Wang Fan directly contacted Zhao Yun who was stationed there through the system and asked him to go to the earth element plane to quietly get a batch of jade that was at least 10,000 years or more, and then transported it to him through the dark gate in the extreme north.

Sure enough, Zhao Yun did not disappoint Wang Fan, but it was just a day's work, Zhao Yun appeared in front of Wang Fan with thousands of pieces of jade, Wang Fan immediately reached out and took this batch of jade, and as an appreciation, Wang Fan directly gave Zhao Yun the real thing he had studied in kind to the sound transmission jade.

And Zhao Yun, who didn't know anything about it, was still full of joy and left with the sound transmission jade slip given by Wang Fan.

Soon after Zhao Yun left, Wang Fan studied the manufacturing drawings of the sound transmission jade slip again, and then started the manufacturing of the wind and fire.

For the first time, Wang Fan habitually used the gestures of the magic array when depicting the cultivation array, but the portrayal failed, and the piece of 10,000-year-old warm jade used to depict it also directly burst into a pile of debris.

The second time, Wang Fan first carefully carved the cultivation array on the sand, and then did not pick up a piece of jade again and began to carve until he was sure that he would not make any more mistakes, and sure enough, this time there was no mistake in this carving, but the shattering still happened as always, because Wang Fan forgot to inject magic at the same time because he focused too much on the formation when depicting, and the result was equivalent to a waste product.

For the third time, Wang Fan once again portrayed and learned the lessons of the last time, and successfully created the first piece of his own sound transmission jade Jane, but the power is not as good as that made by the system.

For the fourth time, Wang Fan succeeded again

The fifth time, because I relaxed a little, the magic introduction suddenly stopped, and I failed again

Sixth, success

Wang Fan directly made a full 1,000 sound transmission jade slips, which took 1 month, destroying more than 200 pieces of 10,000-year-old warm jade, 14 pieces of 100,000-year-old warm jade, 1 million-year warm jade, and the remaining amount of warm jade was less than 100.