As a scumbag, Greta can't tell the origin of the gray fog, but she is clear about the harm of the gray fog.

The essence of the gray mist is actually some high concentration of energy, but these energies are very violent, cannot be absorbed, and can cause harm to humans and elves, so except for powerful professionals, ordinary people will rarely walk out of the ring and enter the gray fog.

Speaking of gray mist, we have to talk about the "specialty" of gray mist, the berserk beast.

For humans and elves, the gray fog is a forbidden area of death, but for the berserk beasts, the gray fog is like their hometown, in the gray mist, the berserk beasts will continue to recover their physical strength, heal their injuries, and the same as the undead Xiaoqiang, and come and go like the wind, without a trace, even the most powerful professionals, they are not willing to provoke these berserk beasts in the gray mist.

Of course, the main reason is that after killing these berserk beasts, there is no benefit at all.

No one knows whether the organs and structures on the bodies of these berserk beasts are useful or not, but what everyone knows is that once the berserk beast is killed, the body of the berserk beast will begin to atomize and decompose, and eventually become a pure gray mist.

Sawyer then understood why those people didn't dare to approach him, and why Carrot would pull him away from his "trophy", it turned out that the corpse of the black beast was not a trophy at all, but a self-detonating bomb!

However, there are also strengths and weaknesses among the berserk beasts, among which the weaker ones are called gray beasts, although these gray beasts are weak, but the color of their bodies will merge with the gray mist, and most of them act in groups, which is the most troublesome.

The stronger berserk beasts, the body will slowly change to black, so they are called black beasts, although these black beasts are stronger, but their body color is different from the environment, and most of them are lone rangers, and the threat level is not much different from the gray beasts.

And even higher are high-level black beasts with pure black body color, as well as more powerful super-level black beasts and berserk black beasts, but what exactly they look like and what characteristics they have, it's not for Greta to know.

If that's all there is, the Grey Mist and the Berserk Beasts wouldn't be worth the headache, the real horror of the Grey Mist and the Berserk Beasts is their reproduction rate and the Kuroshio Tide that occurs almost once a year.

For example, the previous black beast wolf vulture, the scientific name is the horned bone vulture, if there is a wolf vulture that migrates to the vicinity of Qingyan, then in a few years, there will be nearly a hundred more wolf vultures near Qingyan!

According to the research of scholars in the academy, the reproduction method of these berserk beasts is to divide and multiply, when a berserk beast grows to a certain stage, it will split a small part from the body and redevelop into a new berserk beast, and the stronger the berserk beast, the more the number of splits.

For example, the wolf vulture killed by Sawyer can split three to seven juvenile wulls at a time when it grows to the splitting stage, while ordinary gray beasts can only split one young beast at a time.

Of course, the stronger the berserk beast, the longer it takes to grow, and the fewer times it splits, for example, ordinary gray beasts, from the juvenile to the division stage, it only takes one month to half a year, and then it can split at least ten times, while the wolf vulture takes two years to grow to the division stage, and most wolf vultures can only split two or three times in their lifetime.

Rao is so, the multiplication rate of the berserk beast is enough to give humans and elves a headache.

When the berserk beasts within a certain range of the city tower reach a certain density, the berserk beasts will spontaneously impact the tower, forming a beast tide, and because countless berserk beasts gather in the gray mist, it looks like a piece of black pressure, and for all other reasons, it is also called the black tide.

The city with the most frequent occurrence of the Kuroshio is naturally the central ring of the seventeenth ring road, the city's towers are the most powerful, the scope of protection is the widest, and the scope of influence is also the widest, there will be at least three Kuroshio every year, and each time the duration of the Kuroshio is more than a month, that is, the central ring city spends at least a quarter of the time every year dealing with the Kuroshio.

In the sapphire ring city located in the north of the mainland, the frequency of the Kuroshio Tide is once a year, and the duration is generally between half a month and a month, and the interval between the two Kuroshio Tides is as long as one year and as short as ten months, with an average of exactly once a year.

Other cities are also about the same, basically the smaller the city, the fewer the number of rings, the lower the frequency of the occurrence of the black tide, and the smaller the scale, for example, some small cities with two or three rings, there will not necessarily be a beast tide in four or five years, and a gray fog stronghold like Qingyan, because there is no tower, it will not even cause the beast tide, you only need to build the house stronger, and then hide at home when the black tide occurs in the blue city.

At the same time, the occurrence law of the Kuroshio also defines the distribution law of the city, in the radiation range of the towers of large cities such as Blue City, there will inevitably be no other cities, and outside the radiation range of the towers of large cities, the small ring cities are mostly two or three ring cities interdependent, working together to resist the impact of the beast tide.

On the other hand, gray fog strongholds like Qingyan are just the opposite, a large part of them exist within the radiation range of the tall towers around the large ring city, but there are very few gray fog strongholds attached to the small ring city.

Of course, more gray fog strongholds are free from the radiation range of the tower, not that these gray fog strongholds don't want to rely on the protection of the ring city, but they are too far away from the ring city to break through the blockade of the gray fog and migrate, and it is difficult for the masters of the ring city to search for the existence of the gray fog stronghold in the gray fog - to put it bluntly, let alone these gray fog strongholds with uncertain locations, even if it is a gray fog stronghold like Qingyan that relies on the protection of the ring city and is marked on the map, it is difficult to find it in the gray fog, Unless the Grey Mist Stronghold has a significant output, the Ring will create a Grey Mist Passage between the city and the Stronghold.

As for what the Grey Mist Passage is......

Miss Greta still said bluntly that she had forgotten.

Sawyer is also very helpless, Greta is the most "learned" person in Qingyan, this is because when she was a child, Greta's father Carrot asked a passing knight to take her to the Blue City to study, and the other Qingyan people are not to mention the distant Blue City, ninety percent of the people have not even been to the other gray fog strongholds around!

"It seems that if you want to continue to understand the world, you can only go to Blue City first."

Sawa sighed, and looked at the girl next to her who was holding her cheeks and swinging her legs: "Greta, can you take me to the Blue City?" ”

"Don't go! I'm not going to kill me! ”

Greta jumped down from the stool, pinched her waist, and her cheeks bulged as if she had stuffed two xiaolongbao: "Why did you let me take you, you didn't even pay me back the two black coins you owe me!" ”