The dark clouds overhead gradually moved, and the black clouds overwhelmed the city, making the gray gate of the base look even heavier, and even the soldiers guarding the gate felt that the weather was unusual.

"Why do you feel that it's not quite right?"

"Come inside, it's good that the place we went to today is not far away."

"Let's go back first"

The survivors queuing at the gate of the base had an ominous premonition in their hearts, and the efficiency of the queue had been greatly improved.

Next to the office building, two off-road vehicles and four loaded trucks opened the main door, and a group of soldiers in camouflage uniforms came down.

plus three white-faced people who are amazed at everything.

"Wood, you take people to put the medical equipment in the warehouse; Zhou Shengge, arrange for Zhang to teach them. ”

Xu Qingzhou arranged his work with a solemn face, and his pace quickened towards the office building.

Ten minutes later, the alarm sounded in every corner of the Central China base.

"Attention all base residents, please take shelter indoors, and do not take half a step indoors until the rain stops! Again, base residents."

Both the survivors and the base staff were startled by the sudden sound of the siren, and the sound of the horn made the panic even more panicked.

"What's the situation? Let's all go home? ”

"Isn't it just raining, what's the fuss?"

"It didn't feel right just now, there must be something wrong with this rain!"

"Let's go home first, this is the first rain after the end of the world, what if there is anything harmful?"

"Go back indoors, go back indoors!"

In the office building, an old man with gray hair and a military uniform was holding the microphone to communicate with the other party at this time.

"Yes, I can't give out the specific information, but it is enough to attract attention, and it is necessary to avoid the crowd from coming into contact with the rain."

The old man glanced at Xu Qingzhou, who was standing straight opposite, and spoke again, "One more thing, we have an interstellar supermarket here that can provide supplies, and you can exchange crystal nuclei for them." ”

After a few moments, the call hung up.

The old man rubbed his tired brows, "Are you sure this rain will carry the zombie virus?" ”

"Ninety percent sure."

"Where did this news come from?"

“.”

"The couple who sold you the defense bracelet?"

Xu Qingzhou's expression was solemn, "Dad, the most important thing is to build a base to protect the survivors at the moment." ”

"Of course I know, you think I'm one of those bastards who only see profits?!"

The old man glared at him angrily, knowing that his son was determined not to continue, so he changed the topic.

"Do they really have a lot of supplies?"

"A lot."

“.”

The old man said that he did not understand these two words very well.

Can there be so many that other bases can exchange crystal nuclei for them? Although he mentioned it to the person on the other side of the phone at the suggestion of his son just now, he didn't really believe it in his heart.

You know, there is a global shortage of supplies.

This has become the capital on which the major bases depend, and it is also a weapon for the people in power within the base to compete for power and profit!

Xu Qingzhou's eyes flashed under his eyebrows, and he finally swallowed what he wanted to say.

***

At 6 o'clock in the afternoon, the streets of the Central China base were empty.

After seeing the real existence of zombies, even the survivors with bear guts had to listen to the words of the people in charge of the base, and obediently hid at home without going out.

Without him, it is better to believe that there is something than to believe that there is nothing.

What if it's true?

They can't even afford to eat, and their lives are beating back and forth every day on the line of life and death between saving and not saving, how can they take risks again?

It's not necessary, it's really not necessary.

The Star Supermarket also sent off the last customer half an hour ago, and the stock prepared by Cheng Xi two days ago was almost depleted.

She took supplies out of the space and put them back on the shelves while looking out through the oversized floor-to-ceiling windows.

I heard only a thunderous roar, and in an instant heavy rain fell.

The thud fell to the ground, causing a large splash, and the gray-black rain was as muddy as washing a black wall stained with ink.

Wait, gray-black?

Cheng Xi widened his eyes and took a few steps forward, and the whole person lay in front of the floor-to-ceiling window.

"I only know that this rain is abnormal, but I don't know that it can be abnormal to this extent?"

Everyone in the world knows that rain is transparent.

But how do you explain everything in front of you?

Is it dust that is generated after being rubbed by a meteorite pile?

This doesn't make sense!

Shen Xingluo took a step behind and stood beside her, a pair of black eyes staring at the increasingly thick rain on the ground.

"After today, the soil and water will not be the same as before."

In other words, both are useless.

Without soil there is no food, and without water is even more terrible.

He turned to look at her, "For the sake of today, it's better to improve your abilities as soon as possible." ”

Zombies evolve, and the advantage of ordinary people is no longer there, even with a machete, they can't compete with zombies with a speed similar to that of a human.

After today, the zombies will only get stronger.

The neck is stiffer.

When strength is no longer an advantage, the necessity of the ability becomes apparent.

And this is also a skill that the two of them don't usually use.

Cheng Xi was silent for a moment, and when he saw the heavy rain outside, he disappeared into the interstellar supermarket with his thoughts.

Inside, she poured the bag containing 2,000 crystal nuclei into the purification machine, and then found the start button.

"That's it?"

[Yes, the young lady only needs to wait for a minute! 】

[After the crystal nucleus is purified, it will turn into a blue purification liquid, and finally put it into a vial.] 】

Cheng Xi glanced at the so-called vial, transparent color, with a thick thumb and a finger long.

Somewhat familiar.

It is exactly the same as the carrier of the gene essence and the abnormal energy stimulation liquid produced by the previous system.

"So there's only one kind of packaging you interstellar uses for liquids, right?"

【. 】

The silence of the system made Cheng Xi feel that she saw the essence through the phenomenon.

A minute later, 200 test tubes, what we tentatively call tube-shaped carriers, were filled, and the machine arranged them in order as if they were having a Virgo seizure.

Shen Xingluo picked up one of them and observed it carefully, "Ten crystal nuclei can be purified into one bottle?" ”

[Yes!] 】

This ratio is relatively scientific.

"And how much purification will it take to upgrade?"

[According to system calculations, 10 bottles of first-order purification liquid are required to upgrade from first-order abilities to second-order.] 】

[However, according to the current ability status of the host and the young lady, only one bottle per person is enough to advance.] 】

Shen Xingluo raised his eyebrows slightly when he heard this.

The two of them had spent more than a month in space, and their ability training had already reached a critical point.

The so-called promotion, there is only one opportunity left.

And the purification liquid in front of me is that opportunity.

"So ability advancement can also depend on increased proficiency, and purification liquid is not the only way?"

[Suffice it to say, the purification liquid will only play an auxiliary role.] 】