Immediately afterwards, Xia Duo made another laboratory version of the communication magic device, after all, how to use it if there is only one communication magic device? If it is transmitted directly to a natural person, the recipient will have to manually unlock the encrypted information, which is very inconvenient.

In addition, in order to sell products more conveniently, Xia Duo directly limited the communication magic devices connected by the [Twin Secret Law Seal] to communicate with each other, and if the two people can't even see each other, then remote communication is actually not much necessary.

Of course, on the other hand, the simplified 2-ring [Background Communication] can also be used, but this can only be used for direct communication between people, analogous to dialogue, but it conveys text information.

The next step was the actual test, and Shado put away the two lab versions of the communication device and went to the Tirak laboratory, first checking the progress of their research, and then calling Dean out.

"Come and help me do a communication test."

"Well, good!" Dean agreed.

In fact, he has been busy these days without knowing the day and night, in addition to experiments on eternal magic, it is more to supplement his own knowledge, Xia Duo provides the members of the Society with theoretical knowledge such as arcane geometry, in this regard, Sammy and the others are progressing a little faster.

This made Dean feel pressured, so he used almost all his free time, but he was a little exhausted when he pressed himself for a long time, and this time Xia Duo had something to do with him, and he just came out to relax and adjust.

Soon the two of them passed through the portal and came to Savile Town, and the first thing to test was the communication connection in the normal magic network environment of the outside world.

Xia Duo took out the two laboratory communication tools that had not yet been "encapsulated", handed one of them to Dean, and casually cast the [Twin Secret Magic Seal], leaving two identical marks in the two communication magic devices at the same time.

This step, if cast by two people together, may have some kind of ritualistic significance, indicating that this is the beginning of the connection between two people, and of course it is okay to cast it alone.

Now Dean hasn't learned this spell yet, so it's up to Shado to cast it.

"I'll teach you how to use this communication device first."

The use of the communication device is very simple, you only need to activate the communication device in a state of concentration, and then enter the text, which exists in the form of light and shadow.

"The Legend of the Fairy Tree"

It is said to be text, but it is still a projection in essence, but the text projection carries the least amount of information, and the 2-ring spell can only do this.

If Dean were an earthling, perhaps some emojis could be inserted into the text to convey more complex information. However, as of now, Xia Duo has no plans to introduce memes in the wizarding world.

After a while, Dean fully understood the use of this very strange communication device, but just as he was about to activate it, Xia Duo stopped him again.

"Wait a minute."

I don't know if it's the impact of the papermaking incident some time ago, Xia Duo is now very sensitive to this kind of things in the outside world, although the communication device is already an "old thing" that already exists, he is still not sure if anyone is predicting a technological breakthrough in this area.

But if you are cautious in everything, then you should not do anything.

Therefore, after thinking about it, Xia Duo still decided to put the test to the outside world to do, but he still had to do some simple protection, and [Avoidance Detection] was one of them for Dean's blessing.

At the same time, Xia Duo decided that after the communication spell and after the advanced arcane master, in addition to the normal "upgrade", the first thing he had to do was to study the detection spell, as well as the anti-detection spell.

It's a bit like electronic countermeasures, reconnaissance and counter-reconnaissance, jamming and counter-jamming in modern warfare on Earth.

Taking the initiative can be regarded as a key element of success or failure.

Doing the basics, Shado told Dean to get his notice before testing, and then teleported to the north, where he teleported as far as he could, into a strange forest.

Blur teleportation doesn't require specific coordinates, but it's riskier, but it's still largely manageable, and mages are generally reluctant to accept spells with too much uncertainty.

According to the position of the sun, Xia Duo roughly judged which side was south, and then flew high to look at the south, the earth was flat, and it seemed that the end of the world could be seen at a glance.

But the fact is that human vision is limited, blurred beyond a certain distance, and there are various mountain ranges that are far above the height of the eye, in fact, the range of what can be seen (clearly) is very limited.

Of course, Xia Duo will not fly too high, and the limit of his vision is probably the Wolf God Mountain in the south of the Green Bead Forest.

According to the size and clarity of the Wolf God Mountain, the distance can theoretically be judged, but Xia Duo doesn't need to be so troublesome, he just needs to know that this teleportation is far away, far beyond the range of ordinary communication spells.

He tried a few conventional solo communication spells first, but there was no response from Dean's side, it should have been that he didn't receive it, and if there was no mage tower-level communication circle, Xia Duo felt that it should not be so easy for him and Nia to contact him from time to time.

Of course, it's not that there are no communication magic weapons that can be connected from a distance, but those communication magic weapons are not based on [Communication], many of them are related to projection, summoning, and some are even related to curses.

For ordinary mages, the threshold is extremely high, so it is better to borrow the communication circle of the mage tower.

Chadordo remembered that Mrs. Patty should have a long-distance communication device in her hand, and even the Langas could contact the Savile town side, but the use of that communication device was very restrictive.

At least not like the communication device made by Xia Duo, which can be used at any time.

……

——2 Rings [Background Communication] · {Start Testing}

Somewhat similar to the fuzzy teleportation of [Teleportation], [Background Communication] can also be fuzzy sending, but even if it is fuzzy sending, it is similar to the precise delivery of big data on the earth.

[Background Communication] is to transmit information with the help of the background fluctuation of the magic network, which is essentially a kind of large-scale global broadcasting.

The target chosen by Xia Duo is [South, Scene, Dean's Image], within the scope of the spell's effect, although the spell will not automatically retrieve the target, only those that match the target can be received.

Of course, on the other hand, this kind of global broadcast communication can also be easily intercepted, especially when the number of users is small and not encrypted.

If you have a large number of users, it will be less easy to find specific information.

Based on this, Xia Duo also deduced that in the future, there may be monitors who specialize in the background fluctuations of the magic network.

In general, encrypted communication is still a general trend, and communication tools are not worried about not being sold.