That's right, the "it" that Ye Bing said in his mouth is the first building in the base, and it is also the only defensive building that can be built at present - the beam tower!

In the past three days, the reason why he has to carefully control the number of zombies he attracts every time is that the defense capability of the base is too weak! In the case that only one beam tower is difficult to support alone, the fault tolerance rate of Ye Bing's actions has become extremely low, even if it attracts two or three more zombies, it may cause a catastrophe!

But what if the base could have a few more beam towers? It is conceivable that at that time, not only will the security level be improved, but the speed of killing zombies and earning energy will also increase several times!

It can be said that this is a good deal to make money!

Thinking about this clearly, Ye Bing very decisively found the sign of the beam tower and reached out and pointed out!

"Construction Cost: 2 Energy Cost."

"Build time: 3 seconds."

"Do you confirm the build?"

This time, the construction of the beam tower was not free, but the energy cost was only 2 points, which was completely within the range that Ye Bing could bear, so he didn't hesitate, and simply said, "Confirm the construction!" ”

Soon, under the witness of Ye Bing's gaze, another beam tower rose from the ground, protecting Ye Bing's main base tightly in the middle like two pearls.

For such a layout, Ye Bing himself was also very satisfied. At the same time, he consciously observed the changes in other attributes of the base. Currently, its overall properties have been changed to:

【Doom Base】

Base Level: LV1

Health: 500

Credits: 4

Energy limit: 6/50

Control limit: 3/10

Digitization range: 10 meters

It can be seen that the integral has increased from 0 to 4, each beam tower has increased by 1 point, and the material recovery tower has increased by 2 points; The energy limit has been changed from 0 to 6, which means that he still has a balance of 6 units of energy; As for the control limit, it seems that each building occupies 1 point, but before the 10 limits are occupied, Ye Bing can still build buildings without any scruples.

Ye Bing silently wrote down these data, and asked Natasha to jump the interface to the construction interface, intending to use all the remaining 6 points of energy to build the beam tower.

However, when the picture jumped over, Ye Bing's expression couldn't help but be stunned!

"This ...... Why did the icon of the beam tower turn red?! ”

Ye Bing screamed anxiously, and hurriedly pointed with his fingers, but no reaction appeared!

"Commander, you have already built the maximum number of this structures that the base allows, and you cannot continue to build them."

Natasha's voice appeared in time, interrupting Ye Bing's headless fly-like madness.

"The maximum number? How can there be such a rule! Ye Bing shouted dissatisfiedly.

He took a deep breath and said helplessly: "Could it be that in the future, our base will only be defended by these two beam towers?" I suddenly feel so insecure! ”

Natasha replied with a blank look: "Commander, your worries are unnecessary. First of all, as you level up your base, you'll get more power to build more types of defensive structures. Secondly, the maximum number of beam towers to be built will also be increased. Finally, if you wish, you can instantly upgrade the Beam Tower's stats by leveling it up, including but not limited to damage per second and rate of fire. Is the beam tower upgraded for you right away? ”

Ye Bing thought about it, but still shook his head and said, "Forget it." ”

Upgrading the beam tower will certainly bring certain benefits, but the principal paid will also increase a lot. Upgrading from LV1 to LV2 beam towers costs 4 energy, which is equivalent to building two LV1 beam towers, but the effect is far less than the latter.

Anyway, now that the two beam towers are temporarily satisfied, Ye Bing decided to keep the remaining points and wait until he has saved up enough energy for the mechanical barracks to build them together. At that time, the Doomsday Base is bound to usher in a new wave of development climax!

On the fourth day after coming to the Doomsday Base, Ye Bing had the biggest harvest so far.

The 1 unit energy of the solar crystal panel plus the 4 unit energy obtained by recycling the zombies is a total of ......

5 units of energy!

With this energy, the energy storage value in the base exceeded 10 points in one fell swoop, reaching 11 points. Under the joint defense of the two beam towers, the Doomsday Base has completely become a monolith, and the speed of cleaning up zombies has also skyrocketed!

However, this time Ye Bing was no longer as fanatical as before, and he began to become more stable and calm. He found that since the base would not encounter any major danger in the near future, the mechanical barracks were not in such a hurry to build it. Anti-positive energy can't be lost in the base, it's better to save some first, be prepared, and if you suddenly have the idea of wanting to build something, you don't have to stare in vain.

In addition, although neither the base nor Natasha gave an explanation, Ye Bing still felt that upgrading the main base would not be too simple, at least in terms of energy requirements, it would definitely far exceed the amount of ordinary buildings to be built. Currently, the building that consumes the most energy is the terraforming platform, which costs a full 20 energy, and assuming that the base needs 1.5 times more energy to upgrade, it will cost as much as 30 energy! Storing some energy now will also help you upgrade your base later.

Ye Bing originally thought that the time for calm development like this would be longer, at least it would last for another ten days and eight days, but he was wrong.

Sometimes, the change is so sudden that you can't stop it.

Just the day after Ye Bing had just built the Twin Beam Tower, a big accident happened.

It was an ordinary afternoon, well, at least ordinary compared to Ye Bing.

At that time, Ye Bing was sitting in the main base, trying to brew with hot water to alleviate his fear of the solid nutrients that were extremely similar to feces.

Just when he was helpless to find out that doing so was just creating a puddle of thin feces, there was a sudden sound of heavy truck engines outside the base!

Ye Bing's first reaction after hearing this voice was, could it be that the Doomsday Base was discovered by the army?

But after thinking about it again, no, from the sound of the engine, there shouldn't be many people coming. The army wouldn't be stupid enough to break through such a dense crowd of zombies with just one armored vehicle, right?

Thinking of this, he decided to use the monitor to take a good look. The shell didn't have to work hard to adjust it to a fully transparent state, because Ye Bing hadn't turned it back since a long time ago. Anyway, it's good, you can't see the inside from the outside, but you can see the outside all the time from the inside. At first, I was a little frightened to see so many zombies, but gradually I got used to it.

In addition, at night, it is indescribably pleasant to see the dark night sky and the increasing number of stars through the fully transparent zenith.