New buildings appeared in front of him one after another, and Ye Bing was dazzled!

"Multi-barrel laser guns, stun heavy batteries, and the following ...... Oh, and there are special buildings in the Human Legends mode! ”

His eyes were glued to the new images, each of which had a blue flash of blue that was unique to human legends, and it looked particularly dazzling!

One by one, he said:

"Heavenly Desire Garden, Alien Beast Training Camp, Heavenly Purifier, Zombie Research Institute, and Greenhouse Cultivation Garden...... Wow, it looks so powerful! ”

After looking at all the new buildings, he began to read the functional descriptions of each building in detail, and the more he looked at it, the more his heart was excited and his blood boiled!

He slapped his thigh violently, and suddenly laughed wildly:

"Ha, hahaha! God help me, God help me! ”

His eyes stared at the rows of special buildings, unable to move for a long time, but in his heart he had already begun to plan one exciting plan after another!

He counted on his fingers.

Twenty-two days have passed since the beginning of the cataclysm, and there are still eight days to go before the second cataclysm. As long as you use it properly, you can win the advantage before the zombie group officially enters the first level!

However, as far as the base's current energy storage is concerned, there is still a certain distance from the start-up capital he needs, and it must be filled as soon as possible.

Thinking of this, a name suddenly popped into his mind.

Substance Recovery Tower!

Yes. There is a way that if you want to do a good job, you must first sharpen your tools.

If you want to get more energy in a short period of time, upgrading the Mass Recovery Tower is the most cost-effective option!

He immediately jumped up. Soon, the familiar icon of the Matter Recovery Tower came into view. Its icon has changed from red to green, which means "Upgrades allowed"!

He clicked directly at the icon, and the detailed properties of the Matter Recovery Tower immediately jumped out.

Among them, in addition to the attributes that have not changed originally, there are two more lines at the bottom:

"Energy required to level up: 20 energy cost"

"Upgrade time: 30 minutes"

Seeing this, Ye Bing couldn't help but be startled.

He didn't expect that upgrading a material recovery tower would cost so much.

He immediately jumped back to the building interface, looked at the columns of the existing buildings one by one, and found that the upgrade cost of each building was not low, either about the same or higher, and Ye Bing felt a pain in his flesh.

But he soon relented.

It is probably more troublesome to obtain energy now, and when the zombie officially enters the first order, in addition to the corpse being able to recover energy, the magic crystal in the head will be a greater income. Getting energy at that time may not be easier than it is now, but it will definitely come sooner than now.

Therefore, in order for the base to change by leaps and bounds at the beginning of the second cataclysm, he had to make good use of those eight days.

At that moment, something else popped into his head!

Solar crystal panels!

By the way, doesn't this thing also have the function of obtaining energy, but it was forgotten because it was too slow, so I wonder if it will become a little easier to use after upgrading?

But...... Where's that thing upgraded......

Oh, I remember, in the tech tree!

Thinking of this, Ye Bing immediately jumped to the technology tree interface and went straight to the "Main Base" submenu. After entering, after looking for a while, he found the solar crystal option. As soon as you reach out and click on it, the following message pops up:

"Device name: Solar crystal panels. Grade: LV1. Introduction: This device belongs to the main base and obtains energy by absorbing and converting new sunlight, with a current conversion efficiency of 1 point of energy/day. ”

Ye Bing kept his finger on the upgrade button again, and the changes after the upgrade immediately popped up on the screen:

"The conversion efficiency has been increased to 5 energy/day. Requires 10 energy costs. ”

Seeing this, Ye Bing laughed on the spot!

After leveling up, you can gain 5 energy points per day, and you only need 10 energy to upgrade?

That's a lot of money!

After leveling up, it only takes two days to turn back to the old book, and you can get 30 more energy points in eight days, so a fool won't level up!

He thought about it, anyway, it would be difficult to get together the energy to upgrade the material recovery tower today, so it would be better to upgrade the solar crystal panels first.

Thinking of this, he stood up full of fighting spirit, looked at the black zombies that were still surrounding the base, and shouted proudly:

"Tremble, zombie child, Lao Tzu is back!!"

……

Midnight on the same day.

After several hours of fighting, the gate of the base was once again full of blood.

This time, with the base's fortifications, Ye Bing harvested the corpses of more than 200 zombies in only half a day, adding a total of 13 points of energy to the base. However, Rao is so, there is still a 4-point energy gap between upgrading the material recovery tower, and the solar crystal can only be upgraded first.

According to his own ideas, no matter how tired he is, he is willing to fight hard and earn back the remaining 4 points of energy, but unfortunately the environmental conditions no longer allow it.

After a frenzied killing, the zombies closest to the base have been killed by him, and it will take at least a few hours to wait for the peripheral zombies to be completely replenished.

In addition, this time he did it himself, but Ye Bing discovered another problem.

That is, although the location closest to the base, the zombie density has also decreased significantly compared to before.

This is sending a signal to Ye Bing-

If this continues, the zombies that are shrouded outside the base will soon be killed.

Speaking of this, his feelings are still quite complicated.

From the beginning when he was teleported, he was extremely afraid of the black and oppressive zombie sea outside, and then he had a material recovery tower and a beam tower, from finding fun in the process of harvesting zombies, until now, he began to worry about the decrease in the number of zombies, this series of changes was something he himself had never expected.

But either way, facts are facts. Now the sea of zombies shrouded in the periphery of the base has become an indispensable natural protective layer for the base, once they are gone, the possibility of the base being exposed to the field of vision of outsiders will be greatly increased, and that is definitely not the result that Ye Bing wants.

In fact, the area where the base is located is not a high-density zombie area in the first place, and it is not easy to gather these thousands of zombies. And it was these zombies that he killed one or two thousand in less than a month. If this development continues, it is estimated that with the upgrading of the base fortifications, it will not take three months to kill all the zombies outside.

When the time comes, what he will lose is not only an external barrier, but also the greatest source of energy!

In order to prevent that day from coming, he must find another way in advance, find a way to build a robot army, get out of the base, and attack the broader zombie resources outside.

However, surrounded by zombies today, how can you leave with your subordinates is a problem......

Hey, wait!

Ye Bing's mind turned, and a wonderful inspiration suddenly flashed in his head!

It's up to you!