Zhang Zhiping roughly formulated the illusory immortal city plan, the first problem is to solve the problem of connecting foreign monks and the illusory immortal city, his requirements, at least to cover most of the area of the immortal cultivation world, no matter how far apart the immortal cultivators, no matter where they are, they can connect to the illusory immortal city anytime and anywhere, and project their minds to the past, which can form the basis of this plan.

This is not simple, such an ultra-long-distance contact method has always been a problem in the immortal cultivation world, after tens of thousands of years of hard work, the spirit alliance has barely established a set of contact systems in the core immortal cities and immortal islands of the various immortal cultivation worlds, and only the dozens of immortal cultivation realms near the Wolong realm have achieved almost unhindered communication transmission.

Therefore, in the first stage, he used himself as a connection point to connect everyone, and through telepathy, which could almost ignore the distance, the doppelgangers such as Ishihara and Lanhaidao people controlled by him could have used him as a relay to connect, and then introduced them into the celestial space, forming the most basic connection network.

Then, after his research, he used these clones as the center to plant a divine imprint on the monks in their vicinity, and these monks could also connect to this network of connections and form projections in the illusory immortal city to communicate.

It's a pity that although this method is simple, it is impossible for him to act as a contact node all the time, the more people there are, the greater the pressure on him, and it is impossible for the rest of the monks to let others put a divine imprint on themselves, so this connection network can only be used for the first stage temporarily, to facilitate the communication within his own core forces.

What can really make this plan take shape is the fairy city token that he wanted Ishihara to assist in designing, and he refers to the spirit alliance's communication and teleportation formation system, the dark alliance's divine soul connection system, and his own telepathy principle, and plans to design a new communication system as the basis of his plan.

This communication system, the core of which lies in this fairy city token, he first carefully studied the principle of the dark alliance's divine soul network system, and drew on its divine thought wavelength propagation distance, the principle of divine soul particle resonance and the principle of divine soul information transmission as the basis for the communication of the immortal city token, as long as a monk in the foundation building period enters a certain divine thought, he can directly send information to the rest of the immortal city token within a radius of 100,000 miles, as long as the basic token is enough, they can build an ultra-long-distance communication network with each other as a node.

Then, he borrowed the principle of the forbidden teleportation formation in the Spirit Alliance, with the token as the center, as long as a certain amount of mana is entered, a complex small forbidden system can be automatically launched, and then some supporting things are added, and it is easy to arrange a delicate teleportation formation, so that the ultra-long-distance teleportation of the exchanged things can be realized, without having to go to a specific place to trade.

The last point, and the most crucial point, is how to link the token to the Unreal World. With the above two steps alone, he can already build a fragile communication network centered on the token, but it relies on the token as the node to form a network, which is easy to make omissions with the flow of people, which is very unstable.

However, in the second stage, he did not have the ability or desire to build a fixed connection node in a wide area, the consumption of which was too great for even ordinary large forces to bear, and it was easy to attract the attention of the rest of the monks, so he still needed to link it to the illusory world.

It's just that he can't bear to stay in one place to act as a central processor, so after some research, he borrowed the principles of curses and sacrifices to link the illusory world with the token.

The principle of the curse is to use the resonance and connection of heaven and earth and all things to link two things together at a very long distance, and sacrifice is also to connect heaven and earth with an altar, so as to get in touch with a certain thing, and obtain what you need at the cost of equivalent exchange.

Therefore, he used his illusory world as the object of sacrifice, each token was equivalent to a small altar, and then strengthened this connection with the curse method, so as to project the monk's mind to the past, and under the connection of two pairs, this communication network was connected with the illusory world.

To tell the truth, he is extremely greedy for the forbidden communication network established by the Spirit Alliance and the Divine Soul communication network established by the Dark Alliance, although the second stage of the token communication network solves the problem of the number of people and the distribution problem to a certain extent, but the restrictions are still quite large, not only inconvenient but also easily interfered, and it does not solve the problem perfectly.

His real ideal state is to integrate the forbidden communication network, the divine soul communication network and the token communication network to form a super-range illusory immortal city projection system that can completely cover the territory of the human race.

It's a pity that this situation can only be completed in the third or even fourth stage, after he has full control of the Spirit Alliance, the situation of the Mainland Immortal League is similar to overseas, but compared to the relatively enlightened and frequent exchanges overseas, the communication system established by the Immortal League is much more conservative.

Under normal circumstances, the communication network of the Immortal Alliance only circulates in the Immortal Cultivation Realm of Middle Earth and some nearby regions, and a larger range of Immortal Cultivation Realms are directly excluded, just like the Five Kingdoms Immortal Cultivation Realm or even the Jin Immortal Cultivation Realm ruled by the larger Imperial Beast Gate, at most there are barely some teleportation arrays, and it is impossible to directly connect to the communication network of this Immortal Alliance, but this is caused by the isolation atmosphere on the mainland.

The whole plan can be said to be extremely grandiose, and the problems encountered in it are also endless, the most basic fairy city token, Ishihara spent three years, with the help of the huge deduction power in the Tiangong Island Tianyan Instrument, and only barely designed a prototype, more needs to wait for Zhang Zhiping to recover from his injury and then deduce it in combination with the actual situation of the illusory world.

In addition, the operation of the illusory world also requires a certain amount of energy, although the simple projection consumption is very small, but the accumulation of a small amount is probably not something he can afford alone.

Of course, he didn't intend to bear it alone, an important role of the token sacrifice was to extract the monk's mana to maintain the operation of the illusory world, and even he designed to extract a little more mana than the consumption to use for the growth of the illusory world.