(Dear book friends, Xiao Han's book is finally recommended.) Although it is only a small text push, the significance to Xiao Han is very, very significant, which is directly related to the follow-up recommendation and the development of this book. Therefore, Xiao Han hereby imploes everyone to vote for this book no matter what this week, and Xiao Han will use the outbreak to repay everyone's support!! ）

And so it was over for another battle.

Battles that take place in the protective circle are always smokeless, which is one of the differences between base technology and human technology, it rarely relies on gunpowder fortifications, and usually relies on lasers to achieve the purpose of killing. Perhaps this will change as the number of defensive structures and class types increases in the future.

After the battle, without waiting for Ye Bing to give any orders, the mechanized sapper immediately and automatically moved towards the material recovery tower, and after a while, he took the magnet from inside, and ran to the corpse pile of zombies to dispose of the corpses.

Looking at this scene, Ye Bing smiled with a complicated expression. With the improvement of the base arms, the entire base is becoming more and more fully automated. At this time, as the commander of the base, his role has been relieved from the tedious practice of being in the middle of the work, which is both a good thing and a nuisance for him. The good side is that you don't have to be as tired and dangerous as before, and the annoying side is that you have almost nothing to do, and the whole person is a little tired of idleness.

He raised his head and swept his gaze to the zombies outside. The cleanup of zombies has been going on for more than ten consecutive days, and the intensity is getting bigger and bigger day by day, and the total number of zombies killed has exceeded 1,000. Under such a terrifying cleaning speed, the density of zombies on the periphery of the base has finally undergone some visible changes!

In the same way, there are pros and cons to everything. The number of zombies around the base has decreased, so that Ye Bing can escape from here as soon as possible and go outside to save Ji Xiaoxiao's family. Don't look at Ye Bing these days, he has been looking like he is good, in fact, he has been worried about them in his heart. It's just that he also knows that being in a hurry can never solve the problem, and solving the problem still depends on calmness and planning, so he tries to force himself not to think about those things.

On the other hand, the decrease in the number of zombies in the vicinity has also caused some troubles, the most notable of which is that the speed of hunting zombies has reached a bottleneck. The amount of energy that can be obtained through this method is now 10 units per day, and although there is a rapid improvement compared to the past, it will stay at this level, unless there is another revolutionary improvement in the base as a whole.

The reason for this is that every time a part of the zombies is hunted, a certain gap will be created in the circle closest to the base, and it will take a certain amount of time for the zombies on the periphery to fill in. In the past, when the zombies were more dense, the time to fill the gap was very fast, and after killing one wave, you could quickly kill the second wave. Now, although the number of zombies killed in each wave is more, the waiting time is also longer, and the total amount of daily harvest is basically the same.

Seeing this, some people may ask, since there are not many zombies in the inner circle, why not go directly to the outer circle to attract them?

For this kind of question, Ye Bing could only sneer, and didn't even want to reply. Because for a person who is so stupid as to be bent on death that it is in vain.

Although the number of zombies around the base has decreased a little, there are still nearly 10,000, which means that even with the small size of the scout robot, as long as it dares to step out of the protective circle more than five meters, it will attract hundreds of zombies in minutes!

Under the current level of the base, even if Ye Bing upgraded all the fortifications to the limit, he would not be able to withstand a wave of attacks from the medium-sized zombie tide!

However, fortunately, the energy income at 10 o'clock every day is not small, and it can still maintain the rapid development of the base.

With a complicated feeling, Ye Bing walked back to the base again.

Inside the base, the existing properties of the main base are displayed on the large screen:

【Doom Base】

Base Level: LV1

Health: 500

Credits: 14

Energy limit: 25/50

Handling limit: 7/10

Digitization range: 10 meters

It can be seen that with the increase of the building level and the increase in the number of production units, the values of the two attributes of points and control limits have changed greatly. In the new classes, each unit adds 1 point to the base and also consumes an additional 0.5 control limits. Each upgraded beam tower adds 2 points to the base, but the limit it occupies does not change, it is still 1 unit.

In the past few days, in addition to maintaining the normal construction of the base, Ye Bing has also secretly hidden a "small treasury", which contains a full 25 units of energy in private money.

Now, Ye Bing felt that it was time to start using this energy.

He quickly switched to the building interface while controlling the large screen, and now there were only three buildings left to build. Among them, there is no need to build extravagant buildings such as terraforming platforms for the time being, and the rest are tech trees and forge factories.

The price of both types of buildings is very affordable, and each only needs 5 energy to cost, so even if you build it all in one go, you still have a balance in your hand. However, after thinking about it carefully, he still chose to build a technology tree first, after all, it was directly related to the life and death of Ji's father!

"Construction cost: 5 energy cost."

"Build time: 3 minutes."

"Do you confirm the build?"

"Confirm the build."

After Ye Bing completed a series of construction processes, a familiar white light cluster rose from the ground again, spun rapidly outside the base.

Three minutes passed in a blink of an eye. When Ye Bing looked outside the base again, he saw a brand-new magical building appear there!

The reason why it is said to be magical is that among the many buildings in the base, its shape is very different from other buildings. The other buildings either show a sophisticated mechanical style or a strong futuristic technology style, but this new tech tree is really a giant plant like its name! At least that's what it looks like on the outside!

However, after looking at it carefully for a while, Ye Bing found that it was still very different from ordinary plants. Its lush foliage hides many protruding metal antennas and shiny balls that glow brilliantly, and it's a beautiful sight.

Ye Bing sighed, and couldn't help but want to complain in his heart: "Dude, your painting style is obviously different from your companion's, everyone is science fiction, why did you suddenly have a fairy tale ......?"

But when he saw the submenu that appeared after the tech tree was built, he was stupid!

"I'll go, there's such a long list!" Ye Bing couldn't help but exclaim.

I saw that in the submenu interface of the technology tree, there was a long list, each of which represented the name of a building, but only the top few of the list were green, and the other buildings that had not been built were still gray.

At the top of this list, instead of the name of any building, it says "generic"!