On the four-leaf star after the disaster, whenever people think of the city, their first reaction is always the pale gray hidden shield outside the city, which is the foundation of a city's existence and the most important thing in a city. The Hidden Shield www.biquge.info can't deceive the sight, let alone hide the city, what it hides is actually the free state source energy, especially the free state source energy in the soul.

As early as the dark ages after the Great Tribulation, people discovered that in addition to the precious source energy, there were also some nightmarish existences that gushed out from the depths of the earth's core due to changes in the earth's crust. Those things are similar to souls, but they have no consciousness and no reason, they only know aimless wandering, they have no entity, they are made up of pure free source energy, can freely pass through any matter, and at the same time feed on free source energy, and whenever they pass through the entity, they will instantly absorb a large amount of free source energy from the entity. Therefore, there will be no problem when they pass through ordinary matter, but once they pass through the body with a soul, they will absorb the soul that is also composed of free state source energy, causing the body to lose its soul and die.

What's more, the demon spirit's perception of source energy is extremely keen, once the human beings gathered in one place exceed a certain critical point - the number fifty will be used as the standard critical point in later generations, and the number of alien beasts will fluctuate up and down within five people - or the number of alien beasts will exceed a certain number, which is related to the soul strength of the alien beasts, and it will attract the attention of the surrounding and large range of demon spirits, so as to gather here and start a feast of souls.

At one point, people were unable to build cities, or even gather together, and the brave people tried to destroy the spirits, but in the end it was found to be completely futile, the spirits could not be killed at all, and in a sense, they were vulnerable, but they were eternal. These beings are born from a high concentration of free source energy, attracted by the high concentration of source energy, and are themselves a free source energy, and when dispersed, they will turn into pure source energy just like the soul of a human being after death. The more demons scattered, the higher the source energy concentration here, the faster they will reorganize in situ, and at the same time, due to the increase in the concentration of source energy, it will attract more demons in a larger area to gather, and then the number of demons will increase, endless, and the gathering speed is getting faster and faster, and the people who try to destroy the demons are exhausted to death or devoured by the demons.

Humans were tormented by demons and had no choice, and for a long time they had to form a settlement of more than thirty people to fight against the dangerous wilderness, until someone invented the concealment shield.

This kind of shield, which uses source energy as the driving energy source, can hide the soul inside the shield to a certain extent, shielding the perception of the demon spirits. It is with this shield that people can build cities under the protection of the shield and gradually gain a foothold, so it is not an exaggeration to think that the hidden shield saved humanity.

However, the Concealment Shield is not a panacea, and it has its own drawbacks. First of all, their energy consumption is too high, and most of a city's energy income is often used for the maintenance of hidden shields, and not much is actually used for industry and life, which directly leads to the crystallization of source energy into a large transaction currency used all over the world. Second, their effectiveness is limited, with upper limits on coverage and concealment, and the excess is invalidated, and there is no obvious hint, which greatly limits the expansion of the city. Third, once a large-scale death event occurs within the concealment range, such as hundreds of people dying at the same time, so that the concentration of free state source energy within a certain range is too high, then it will temporarily break through the upper limit of concealment, and then attract the attention of the demon spirit.

These shortcomings lead to the fact that human beings are still at an obvious disadvantage in the struggle against demons, and at the same time, they also cause the isolation of cities from each other, unable to form large-scale caravans for transportation, and the goods between cities can only rely on small caravans for a small amount of trade, and the world's large-scale production cannot be carried out, and all kinds of precision machinery have completely lost the possibility of mass production, and only a few extremely special super-large cities can barely make them, so that many pre-disaster technologies have been completely lost and have become legends that cannot be verified. There are also people who have tried to form a large-scale convoy with a small number of people for transportation, but they have never returned alive, after all, in addition to the demons in the wilderness, the alien beasts are also full of curiosity, and there are not enough defenders to protect them, and the large-scale convoy is the best toy for the alien beasts. As for rail transit, even if thousands of people were sacrificed to lay the tracks, there has never been a single track that survived for more than five days after it was built, and there may be nothing lacking in the wasteland, that is, there is no shortage of wild beasts and alien beasts living underground.

Of course, the isolation of the city also makes inter-city wars rare, after all, no one can be sure that they can organize a force of a few hundred people to go to the neighboring city, and finally there can be a few alive to reach the target location, even if most of the surviving troops can really reach the target, once the war starts, there will be mass casualties on either side, and the harvest will only be a dead city and a large number of demons that are unwilling to disperse for a long time. Therefore, to rush into war is simply to play a joke with yourself.

As a result, human beings can only rely on hidden shields to build isolated island cities in the wilderness, barely fighting against the wilderness and demons, and seeing the shield means seeing civilization and the hope of life.

"See the city, rose, that's the city of brocade. The leopard lifted the grip of the locomotive with both hands, pointed to the pale gray city hidden shield in the distance, and shouted, "I will sleep in the softest bed and eat the most expensive meal today." ”

"No problem, it's just that the expenses have to be deducted from your share, and the brothers have to settle the accounts. Rose replied with a cold face, "Anyway, we just made a lot of money, and you can squander your share as much as you want." ”

"It's so stingy, Rose, you're the most angry, hmph, it should have come out of the public treasury. The female leopard turned her head, not looking at Rose's hateful expression, and muttered dissatisfiedly, "I don't care, anyway, I have to eat well and live well, and I have to get out of the public treasury." ”

"Snort. The female leopard's tricky appearance made her teammates' cold faces couldn't help but smile, Rose shook her head, and said helplessly, "Okay, I know, today we live in the most exclusive room and eat the best food, who let your big cat pick up so much money by mistake." ”

Actually, Rose was right, the two did pick up quite a lot of trophies, when they came, the two of them rode in the same sidecar locomotive, and now it has become one person, the original locomotive's sidecar, stacked with more than a dozen locomotive engines, that is the most expensive part of a locomotive in the current era, and the new locomotive's sidecar is loaded with a large number of well-maintained weapons and ammunition, and the entire sidecar is full, and there is no gap at all. There is no need to doubt that these will be transformed into golden gold and crystal clear source energy crystals, and put them in the pockets of the two of them, so both of them are very happy, after all, no one will dislike their money.

So, the two ladies muttered wistfully what they should eat at night, and approached the city of brocade.