Although the soul bodies of ancient civilizations in the past could transmit soul viruses themselves, and they could also indirectly spread viruses with the help of infected soul bodies, there were still many unknown restrictions on the spread of soul viruses.

On the one hand, those soul viruses are not active enough, there is no way to spread them over long distances, and there is no way to infect other living beings after a distance of several hundred meters, on the other hand, the production of soul viruses is not large, and the number of soul viruses that can be produced in a unit of time is relatively limited.

Only when a large number of infected soul bodies are used as intermediaries to continuously multiply and spread the soul virus, can the soul virus spread to the entire planet in a short period of time, so that all life within the planet can be infected and harvested.

The existence of these restrictions made it impossible for the army of souls of the previous ancient civilizations to directly infect the people inside the planet and paralyze the planet's defense system in advance from a distance of hundreds of kilometers and a layer of atmosphere. This is also the reason why the army of souls of ancient civilizations has repeatedly hit a wall after the new planetary defense system has been established.

In fact, the soul bodies of ancient civilizations have long been trying to use the huge number of infected soul bodies to erode and infect the people inside the planet from a long distance, and then under the effect of surrendering without a fight, they can easily harvest all the soul resources inside the planet, but they can't do it.

Those few infected souls who have passed the planet's defense system in small numbers and are lucky enough to pass through the planet's defense system are not enough to complete the harvesting of souls inside the planet, their actions are a little bigger, which arouses the vigilance of the planet where they are located, and soon there will be a professional team with soul detection components to destroy the infected souls, and there is no way to make a big noise inside the planet.

However, this situation has quietly undergone new changes as more and more ancient civilization souls have gathered in the army of ancient civilizations on various roads.

The souls of the ancient civilizations found that in the process of launching attacks on those ecological planets, as the number of infected souls destroyed increased, the scale of the free soul viruses that they could feel and scattered in the void began to become larger and larger.

These free soul viruses are the soul essences in the bodies of those infected soul bodies, and they are the core of the most elite soul viruses, and after the soul bodies of many infected soul bodies are destroyed, these soul essences have dissipated between heaven and earth, and they have not been annihilated for a while.

And under the meticulous sensing of those infected soul bodies, they were surprised to find that these scattered soul viruses did not completely "die", but still retained some latent activities, which could be manipulated and activated, and seemed to have further use value.

This is also why these ancient civilization souls do not need to be on the front line of the battlefield, as long as they drive a large number of infected souls to attack the ecological planet from afar, such a war for the ancient civilization souls has no other risks except that the gains may outweigh the losses, so they have the time and energy to do nothing on the battlefield to study those soul viruses.

Changing the ecological planet that was attacked, the commanders of those interstellar civilizations were facing a grim combat situation, and they all wanted to turn into octopuses one by one, so as to take into account the situation at all levels of the battlefield at the same time, how could the United States have the time to engage in scientific research on the battlefield.

However, the souls of the ancient civilization also discovered that these scattered soul viruses are not so easy to control, although one or two ancient civilization soul bodies can feel the huge changes in the concentration of soul viruses in the battlefield environment, but it is not enough to drive those scattered soul viruses, let alone activate the activity of these soul viruses from a distance, so that they can erode and infect the bodies and souls of normal life.

In order for these scattered soul viruses to truly have an effect, or even directly erode the life forms inside the planet through a layer of planetary defense system, at least dozens of ancient civilization soul bodies must gather together and use spiritual power to drive these scattered soul viruses together.

I am afraid that there is no possibility of achieving such strict conditions at all, the soul bodies of ancient civilizations have always acted separately, and the planets stationed there are far away, and if they want to join forces to control these soul viruses for long-distance spread and infection, it is simply the basis for not being realized.

But now the souls of the ancient civilizations are carrying out a great migration in the immigrant star field, and all the souls of the ancient civilizations have been evacuated from the planets where they are stationed, and the hundreds of rivers and seas are concentrated from a small evacuation team to a larger evacuation team, and there are at least a dozen or dozens of ancient civilization souls gathered in each formed evacuation team, so that if you want to gather enough people to manipulate the soul virus for remote infection, it will not be difficult at all.

So after gathering enough souls of ancient civilizations, some teams began to try new offensive tactics, and the results of this trial can be described as quite obvious, as long as the destroyed infected souls reach a certain scale, and the scattered soul viruses reach a certain concentration, they can really cross a distance of hundreds of kilometers to directly infuse the soul virus into the interior of the planet, infect the population on a large scale, and harvest soul resources.

In this way, the soul body army of the ancient civilization does not need to force the defense system of those ecological planets at all, and only needs to consume a very small part of the infected soul body to harvest the resources of an entire planet, so that the benefits of the war remain the same, but the loss is reduced by at least dozens of times.

And with the spread of the news, the soul armies of other ancient civilizations naturally used this new combat tactic, and they all gained a lot.

Some teams have even conducted refined data tests on the conditions for remote override of soul viruses, and according to the tests, if you want to infect a standard ecological planet from a distance, you only need to have about 10 million infected soul bodies destroyed, and the escaped soul viruses are enough to use.

And any ecological planet, as long as it is run by an interstellar civilization, there is no one with a population of less than 100 million.

Because interstellar-level civilizations are generally in the lower layers of the biological chain in the universe and the sea of stars, their survival pressure is generally not small, and they must improve their productivity as much as possible, so they can't make those extravagant uses, so that a good ecological planet is only inhabited by millions or even fewer citizens.

Even in a cosmic-level civilization, such a practice is extremely extravagant, and only some top-level powerful families can enjoy similar treatment, which is not a common practice.

Therefore, the ecological planets of interstellar civilizations generally have at least a billion people, and some particularly prosperous planets even have hundreds of billions of populations.

If this time the ancient civilizations only have these interstellar civilizations that have immigrated to the star field, then even if these interstellar civilizations have soul body detection equipment and a planetary defense system that can resist the attacks of the ancient civilizations to a certain extent, then these interstellar civilizations will finally have to choose the only way to kneel down again.

If these interstellar civilizations do not kneel, the army of ancient civilizations will be swept away planet by planet, harvesting all the soul resources that can be harvested, and destroying all civilizations that are unwilling to give in.

Such a planet swept down planet by planet, even the most loyal and tenacious interstellar civilization can not hold on, in order to survive, even if the harsh conditions are they have to agree, no matter how much the ancient civilization made them feel deeply disgusted, they will fall under the command of the ancient civilization again.

Because for these interstellar civilizations, no emotion or hatred is as valuable as survival, and in order to continue to survive, even demonic civilizations are willing to return to the past.

If that really happens, the ancient civilization will immediately regain its position, and the ancient civilization in the territory of the immigrant star field will immediately take it back.

It's a pity to re-annex to the ancient civilization, this is definitely the most helpless choice, if there is no other option, these interstellar civilizations that immigrate to the star field will not choose so.

Because they are attached to other civilizations, these interstellar civilizations may only pay benefits and loyalty, but under the command of ancient civilizations, these interstellar civilizations will even pay for the lives of their own citizens, and even if they are not careful, the entire civilization will suffer a catastrophe, and the speed of destruction may not have time to react at all, which is too terrible, and no one will choose such a harsh monarch until the last resort.

At present, in the immigrant star field, there is also a powerful civilization of the earth civilization that can ask for help, and it is not only the option of surrendering the ancient civilization, so even if many interstellar civilizations have realized that the ancient civilization has a new killing move, they still instinctively ask for help from the earth civilization.

Although the earth civilization does not have a very good way to completely resist the remote penetration and infection of the soul virus of the ancient civilization for a while, but the feasible and somewhat effective method, the earth civilization can still come up with it, that is, to adjust the planetary defense system outward and adjust it to a higher orbit, so that it can naturally expand the distance of the soul body of the ancient civilization to remotely control the soul virus.

The distance of remote control of the soul virus has become longer, which for the souls of ancient civilizations, not only will it mean that it is more difficult to control, and there are more people who need to be controlled, but also it means that in order to achieve the appropriate concentration of soul virus, the number of infected souls that need to be consumed will increase, and even it is very likely that after a certain distance, the possibility of remote control of the soul virus activation will no longer exist, and it will become completely impossible to remotely infect the virus, which is undoubtedly real.

What the specific coefficient of these effects will be, the earth civilization is not clear, the only thing that is certain is that as the planetary defense system is adjusted to a greater distance from the planet, this will bring countless troubles to the souls of the ancient civilizations!

In fact, this kind of change will also bring countless troubles to those interstellar civilizations, which orbit the planetary defense system is built on, which is also carefully calculated, and where it is located can take into account security, consumption, The scale of investment, and the maximum extent to the ancient civilization soul army, there are countless elaborate designs, in a short period of time can be formed that is by countless interstellar civilizations together to carry out careful design, and now all of a sudden to change the course, re-change the orbit height to arrange the planetary defense system, the relevant design details involved here are naturally more than countless.

Rashly adjusting the layout of the planetary defense system, if it is not done well, it will directly weaken the comprehensive performance of the planetary defense system, and even produce large defense loopholes, which may threaten the safety and survival of the entire planet.

However, now the various migration armies of the ancient civilizations are menacing, and many planets have been destroyed one by one, and people are panicked everywhere, so naturally these interstellar civilizations do not have too many choices, and no civilization dares to ignore the suggestions of the earth civilization.

After all, to deal with ancient civilizations, the earth civilization is the most professional, and the many interstellar civilizations that immigrated to the star field also have to obey!

You must know that even the three cosmic-level civilizations that are located in the absolute ruler class in the surrounding galaxies have not been able to take advantage of the confrontation with the ancient civilizations, and the difficulties of the ancient civilizations can be imagined.

However, in the face of the earth civilization, the ancient civilization has lost one after another, and has been defeated to the ground, and there is no power to parry at all, so it is self-evident how much the earth civilization restrained the ancient civilization. Even the planetary-level soul detection equipment exported by the earth's civilization to the outside world has made various interstellar civilizations breathtaking, thinking that the level is really unimaginably high, and even the cosmic-level civilization is difficult to match.

Therefore, for the earth civilization, it is necessary to adjust the orbital height of the defense system as much as possible, and on the premise of ensuring the integrity and security of the defense system, adjust the entire planetary defense system as high as possible, and the farther away from the planet itself, the better, so as to minimize the threat of being destroyed by the ancient civilization. No interstellar civilization dares to take it seriously, and they all regard it as a lifesaver.