Li Yunfei was stunned for a moment, and after checking it, he felt that the bag was very heavy, and there was a sound of metal colliding inside, which seemed to be something like a weapon.

As soon as he opened the bag, he felt a dazzling light, reached out, and took out a metal sphere from it.

The metal sphere was composed entirely of Mithril and Magic Crystals, and the Mithril Ball was engraved with dense patterns of magic circles, and there were more than a dozen neatly arranged holes on it.

Looking through these holes, you can see that the inner core is emitting a faint cyan light, and it is a fist-sized wind crystal.

Wrong...... This is not an ordinary wind crystal, but ...... A Wind Demon Marrow!

This Wind Demon Essence is wrapped in an ordinary Wind Demon Crystal, and it is the size of a walnut, which is precious. You must know that the wind magic crystal itself is extremely rare, and the wind demon marrow is even less than less, and the rarity has completely reached the level of divine materials, and a piece the size of a fingernail is worth a fortune, and now such a large piece can no longer be described as precious.

Then he dug into the bag again, and once again pulled out a Mithril ball of the same size.

The structure of the two Mithril balls is exactly the same, but the formations on them are not exactly the same.

As a master of the alchemy circle, Li Yunfei immediately discovered that the alchemy circles engraved on the two Mithril balls could form a set of magic circles, which had the attribute of mutual absorption.

And many of the circuits on it are somewhat similar to the "sound cannon" made by Xue Li at the beginning.

"This is ......" The moment he saw this thing, Li Yunfei vaguely guessed something, and immediately looked at Bohr excitedly.

Bohr said proudly: "Yes, this is exactly the 'magic sound' you mentioned before!"

"There is no problem with the magic sound system that you mentioned earlier that uses Mithril filament as a wire, and even more than a dozen sets have been produced and dedicated to the Lionheart, but they are not very valued. Speaking of this, Bohr smiled bitterly, and then said: "Although this thing is convenient, it has a lot of sound transmission magic, and a strong person of the level of the Great Emperor can also directly transmit sound for thousands of miles, and our magic sound system is limited by wires, so it has not been adopted on a large scale." ”

"The Great Emperor just took those few sets of magic sound systems and used them for the defense of Lionheart Imperial City. Because of this, the follow-up magic sound system was not produced again, after all, although this thing can barely transmit sound and message, there are still many problems, especially all kinds of noises often appear, and it is impossible to communicate normally and clearly. Bohr said again, his voice revealing helplessness.

Originally, after getting Li Yunfei's idea, he was very excited for a while, thinking that this thing could change the human world, but he didn't expect that the final result would not be so, and he couldn't help but be a little frustrated.

Then he suddenly raised his head, looked at Li Yunfei with an excited expression and said, "However, old man, I won't be stumped by this question! You also said before that once the magic sound system is perfected, it will definitely have an extremely powerful effect, so I thought later, if I don't use the Mithril wire, can I have a normal conversation?" At first, I really didn't have a clue, but then I thought, the reason why sound can be transmitted through Mithril filament is actually because sound is directly converted into magic, so if you find two magic circles that can attract each other and transmit this magic power to each other, then you can do without Mithril filament?"

"After many experiments, I finally found the current magic circle, kept the whole magic sound system in a stable state, and finally succeeded! As long as the two magic sound systems speak on one side, the other can hear it! There is no need for a mythril wire!" Bohr said this, his eyes gradually brightening.

Hearing this, Li Yunfei couldn't help but secretly admire in his heart, and at the same time gave Bohr a thumbs up directly. Although the alchemists of this world do not have the same systematic knowledge as on Earth, they are not weak in imagination and creativity. Bohr was able to directly think of and develop a mobile telephone terminal system, and this was definitely a great cross-era invention! Thinking of the changes that mobile phones had made to the whole world on the earth in his previous life, Li Yunfei could not help but tremble with the same excitement.

It was only then that Bohr suddenly became frustrated again, and said: "But after I made it, I found out that this is a completely whimsical idea, which consumed so many rare materials, and finally produced this system, although it can transmit sound, but it can only be carried out within tens of kilometers at most, and the materials consumed are too precious to be promoted at all, and even I doubt that it can be replicated......"

Only when it is popularized and used on a large scale can alchemy equipment be developed to the greatest extent, and this kind of alchemy equipment, which can only be used by a very small number of people, is not very useful in Bohr's view.

"It's useless for me to keep it for myself, it's better for you to take it to the half-plane of the steel soul, if you have any friends, there will be a good response between the two of you. Eventually, Bohr told him what he was trying to do.

Li Yunfei's heart warmed and he said: "Dean Bohr, thank you! Such a valuable thing is really deserved. But please rest assured, this mobile magic sound system is definitely a cross-era invention, I have a hunch, it will eventually become one of the alchemy equipment that will change the whole world! I will borrow it for a while, and when I come back from the steel soul half plane, we will talk in detail, and we must not let your hard work be in vain. ”

"Haha, if only that were the case, to borrow the good words of the president!" Dean Bohr laughed and bowed, "This moving magic sound is really apt, and only you can come up with such a name." ”

Li Yunfei couldn't help but roll his eyes, and wondered if he could improve the mobile magic sound system and create relevant equipment that could be mass-produced and promoted, would he want to set up a mobile company? When the time comes, should he build some base stations and then charge phone bills, roaming fees, or something?

When it comes to the festival, several high-level officials of the imperial city will also be able to make phone calls to pay New Year's greetings......

Then he shook his head, shaking off the brain hole that had just appeared, and stopped thinking about it.

Everything, let's wait until he returns from the steel soul half-plane. This mobile magic sound system should be able to be used by then.

Thinking of this, he put this thing into his space ring, and then saluted Bohr and said, "Then thank you Dean Bohr!

After saying that, he turned around and left the Royal Alchemy Academy of Lionheart Imperial City. This time, he was really going to leave here completely, and it wasn't long before the opening of the Steel Soul Half-Plane.

Looking at the back of Li Yunfei leaving, Bohr couldn't help but have mixed feelings in his heart.

Thor, you must come back alive, the future of the Spider Society, the future of alchemy, and the future of the entire human race all need you to live!