"To unlock the item 'Elixir of Life', you need to pay 1 energy cost. Do you want to unlock it? ”

Only 1 energy cost?

Looking at the line of prompts that popped up on the screen, Ye Bing was silently surprised in his heart.

"Confirm unlocking."

"Click!"

Just after Ye Bing's order was issued, there was really a sound of a lock opening in the base!

Ye Bing smiled a little helplessly, and didn't know what to say.

At the same time, the unlock button on the right side of the life potion has disappeared, replaced by two new icons, which are written "upgrade" and "production" respectively, and in the introduction of the life potion, the level has also changed from "unlocked" to "LV1", in addition, when Ye Bing's finger is lightly placed on the upgrade icon, you can also see the changes that will occur after the potion is upgraded. It reads: "A 10% increase in speed of action, a 20% increase in potency, and a double effect on the treatment of heart and lung diseases." Requires 5 energy to cost. ”

After reading this introduction, Ye Bing couldn't help but be moved. He vaguely remembered that the reason why Uncle Ji was suffering from perennial pain had a lot to do with his bad heart, and if LV2's life medicine could effectively improve heart and lung problems, it would still be necessary to upgrade. Anyway, he's not short of those 5 points of energy.

So, without hesitation, he clicked towards the upgrade icon.

"To upgrade the item 'Life Elixir LV1', you need to pay 5 energy costs and upgrade for 5 minutes. Do you want to upgrade? ”

It turns out that it will take some time to upgrade, but it doesn't matter, 5 minutes is not much longer anyway, just wait a minute.

"Confirm the upgrade."

Just after Ye Bing chose to confirm the upgrade, the alarm clock icon popped up again in the upper left corner of the big screen, and the upgrade items and time required were indicated next to it. Taking advantage of this time, he jumped the screen to the antiviral serum interface again, and wanted to just unlock the lock and be done, but he inadvertently saw the changes after the upgrade, which was written "Enhance your own immune system and permanently gain the ability to resist type I biochemical viruses", and then he was not calm on the spot!

On the matter of whether to upgrade the serum or not, Ye Bing struggled for a while, and finally chose to give up. There's no way, it's really not much energy at hand, it's an expense to exchange medicines later, it's another expense to build a forging factory, and the most uncomfortable thing is that there is not much time left for him, and he can't wait! So after thinking about it, I can only choose to give up for the time being, and talk about the rest when I am rich in energy in the future.

"Jingle Bell~"

Shortly after he made his decision, a chime echoed through the base again, this time with a short, graceful harmony that signaled that the item upgrade had been completed.

At the same time, there was also news of an increase in points:

"The Life Elixir has been upgraded, and the main base has gained 2 points, and the cumulative points are 18 points!"

(This includes the 2 points earned when building a tech tree in the previous chapter)

Ye Bing jumped back to the interface of the life elixir and found that it had indeed risen to LV2. At this point, the upgrade button also changes from green to red, indicating that the tech tree needs to reach a higher level in order to level up again.

Then, Ye Bing clicked the production button again, and two options immediately popped up from below, which said "Life Elixir LV1" and "Life Elixir LV2", where the former costs 1 energy per bottle, and the latter costs 3 energy per bottle. Ye Bing thought about it and directly chose to produce two bottles of LV2 elixir. Each bottle had to wait for 3 minutes, a total of 6 minutes, taking advantage of this, Ye Bing went to the antiviral serum and spent 5 points of energy to buy 5 tubes of serum, each tube took 1 minute, a total of 5 minutes.

After doing this, Ye Bing decided to take a look at other interfaces.

He exited from the medical interface to the sub-interface of the tech tree, and looked at them one by one in order from top to bottom, and found many extremely interesting technologies, which can not only simply upgrade items or troops, but also make specific enhancements to a certain aspect of it, or give it functions that it did not originally have.

In the case of beam towers, as long as you unlock a technology called "multi-joint optical path", the lasers of several beam towers can be concentrated and released, directly doubling the damage dealt. Although it also reduces the rate of fire, it is quite powerful against some units with strong single defense.

Originally, Ye Bing had the heart to unlock this technology, but after looking at the energy cost, he decisively gave up. is such a technology, it takes 10 energy to unlock it, which is still a bit unbearable for Ye Bing now.

Six minutes later, several bottles of customized potions were finally produced, and without Ye Bing's orders, the mechanized sappers outside had already sensibly delivered the potions to Ye Bing's eyes.

Three red life elixirs and five purple antiviral serums have a strange beauty in their hands.

Ye Bing carefully put them on the storage shelf, and reluctantly left after confirming that they would not slip. You must know that in the future, these vials of medicine will be his hope and lifeline!

Anyway, a big thing has been accomplished, and with the life elixir as a guarantee, even if Uncle Ji's illness cannot be completely cured, it is at least possible to prolong his life.

After doing all this, Ye Bing only had 14 points of energy left. After thinking about it, he decided not to delay any longer and immediately build another crucial building!

I saw his fingers linked, and soon changed the screen to the construction interface. As he became more familiar with the operation of the base, there was no need to call Natasha for help in such trivial matters.

After the construction interface popped up, Ye Bing stretched out his finger and finally clicked on the construction icon called "Forging Factory"!

Regarding the introduction of the forging factory, Ye Bing had already seen it many times, so he skipped it directly and clicked on the construction.

"Construction cost: 5 energy cost."

"Build time: 3 minutes."

"Do you confirm the build?"

"Confirm."

In the next second, a new ball of white light appeared in the designated place and spun rapidly.

Ye Bing walked out of the gate of the base, looked around the base, and found that the protective circle, which was originally spacious, began to appear narrow with the increase of buildings and robots, and every few steps was a tall building, walking through it made Ye Bing suddenly feel like walking in rows of high-rise buildings.

Thinking of this, Ye Bing couldn't help but start fantasizing. As long as he is alive and the base is still developing, then presumably one day the scale will become larger. When the time comes, will it be possible to develop into a large base like a small city? If so, will the existing city buildings be retained, or will they all be torn down and rebuilt into a steel fortress made entirely of futuristic technological buildings? If it really develops to that extent, it will be quite lonely to live in it alone!

Thinking about it, his thoughts couldn't help but fly away. Suddenly, a crisp chime pulled him back into the real world.

"Ding!"

"The construction of the forge factory LV1 has been completed!"