Just as Lu Cheng was secretly observing the elite-level zombie, the elite-level zombie suddenly let out a strange scream.

It didn't sound like a human sound, but this kind of screaming sound was a bit similar to sound waves, and although Lu Cheng could hear it, he was sure that humans couldn't hear it.

And the zombies gathered downstairs in their apartments, after hearing this sound wave, quickly surrounded the elite zombies.

At first, Lu Cheng thought that the elite zombie could control these zombies, but he didn't expect that the elite zombie turned his head and climbed up the wall with agility, and climbed into the apartment building through the window on the second floor.

The zombies who were attracted by his screaming sound also quickly rushed into the apartment building.

Lu Cheng understood that the elite-level zombie could not control these zombies, but attracted the zombie group outside through sound and entered the apartment building opposite.

Although I don't know why that elite zombie did this, on my side, the group of zombies surrounding the door of the apartment is scattered.

But Lu Cheng ushered in a new problem.

If he wants to upgrade, he must have an elite-level alienation crystal nucleus, and he must deal with the elite-level zombies that are not easy to find.

But the apartment building where the elite-level zombie was located was now filled with hundreds of zombies.

Even if Lu Cheng upgraded Shen Xue and Zhang Xiaoyun to the same LV5 as himself, he didn't dare to get into that apartment building casually.

If they are really surrounded by hundreds of zombies, they will all die.

But the opportunity is just around the corner, and if you miss this time, you don't know when you will be able to meet the elite-level zombies.

Besides, the end of the world has been going on for several weeks, and he is a latecomer who is catching up, who knows if there are more powerful zombies in the elite level?

You have to seize every opportunity and get stronger quickly.

Just as Lu Cheng was thinking about how to bypass hundreds of zombies and kill that elite-level zombie, Zhang Xiaoyun suddenly pulled him, pointed to the fifth floor of the apartment building opposite, and said:

"Brother Cheng, look at someone over there."

Lu Cheng followed the direction pointed by Zhang Xiaoyun, and sure enough, he saw the window of the corridor on the fifth floor, and saw two people constantly carrying furniture to pile up in the corridor.

And the furniture was piled up all the way to the corner junction of the fourth floor.

The zombies pouring in from the outside also happened to be in this position at this time, but they couldn't break through the obstacles caused by so many pieces of furniture piled up for a while.

Lu Cheng suddenly thought of a possibility.

There are survivors in this apartment building!

It seems that this elite-level zombie wants to break through the barriers piled up by these survivors by attracting the zombie group outside.

As for the reason, it may be to eat, and maybe it can evolve.

Lu Cheng himself, for example, has no appetite for zombies, but his appetite for humans is incomparable.

If he hadn't had human sanity, he would definitely be like those zombies, devouring the surviving humans.

Maybe these alienated zombies eat people, and maybe the same effect as him eating the alienated crystal nucleus.

Otherwise, how could an elite-level LV5 zombie come out, it can't be photosynthesis.

Thinking of this, Lu Cheng had a plan that might be possible.

The humans in the apartment building across the street are the best bait.

As long as they are still there, this elite-level zombie will not be far away, and it may even rush out to attack them when the zombie horde attacks the survivors.

Then if you can sneak into that apartment building, and when that elite-level zombie rushes out to attack them, and give this elite-level zombie a little shock to the corpse king, won't you be able to get the elite-level alienation crystal nucleus?

Lu Cheng is sure that as long as he can break through LV5 to LV6, there will definitely be great benefits.

After all, the upgrade materials are different, and it has been so many days that he has only seen this elite-level zombie.

Once the rough plan is determined, all that remains is the question of how to execute it.

Climbing the wall and walking like the elite-level zombie just now, Lu Cheng knew that he couldn't do it.

It should be a stunt unique to that elite-level zombie.

How to bypass the hundreds of zombies, enter that apartment building, and find the survivors became a big problem.

And when a person can't think of it, he can find someone to discuss it with, and at this time, Zhang Xiaoyun, who still has human reason and all his memories, comes in handy.

Lu Cheng briefly said his plan, and Zhang Xiaoyun also pondered for a while, then thought about it and said:

"Brother Cheng, can we go over from the underground garage?"

"I've thought about this method, but the stairway is absolutely full of zombies now, and we can't go up at all.

If there was no power outage last week, I could still take the elevator up from the underground garage, and I don't have to think about it now. ”

After Lu Cheng finished speaking, Zhang Xiaoyun said again:

"Then do you want to learn from that zombie just now and climb the wall?"

Lu Cheng looked at Zhang Xiaoyun as if he was joking, and asked:

"Do you have a way? You're not going to learn mountaineering, are you? ”

Zhang Xiaoyun immediately nodded:

"Yes, yes, my parents are both mountaineering enthusiasts, I grew up playing with them, if we can have professional climbing tools, there are a lot of peripherals on the exterior wall of the apartment building, we can easily climb up."

As soon as Zhang Xiaoyun said this, Lu Cheng thought about it.

It's just that the peripherals are like air conditioners or something, all on the back of the apartment building, and I don't see it.

If you have some climbing tools, you can really climb directly up the outer wall.

Look at the place where the survivors pile up their furniture, it is also on the fourth or fifth floor, as long as you can climb to the fifth floor, you can sneak in.

"I know there's a sporting goods store across the street that should have climbing equipment in there."

After Zhang Xiaoyun finished speaking, Lu Cheng nodded without hesitation and said:

"Okay, when it gets dark, we'll go over and have a look."

You can also go find some weapons that can be used.

My own baseball bat is quite easy to use, but there is only one baseball bat, and after hitting so many zombies, the wear and tear is already very serious, and the sticks are a little deformed.

Even if you can't find a crossbow, it's good if you can find some throwing sticks, electric batons or something.

These things are strong enough, Lu Cheng picked them up and beat zombies, which was really more than enough.

The two quickly discussed the details.

After less than two or three hours, Shen Xue came back covered in blood.

Of course it's not her blood, it's all the blood of those zombies.

To Lu Cheng's surprise, Shen Xue actually brought back sixteen alienated crystal nuclei!

It seems that his own minion zombies can also extract the alien crystal nucleus like themselves, which is much more convenient, and there is no need to pick up things after him.

Eight of the alienated crystal nuclei were used to upgrade Shen Xue.

After upgrading, the properties panel becomes:

【Shen Xue】

[Alien Virus Level: S Class]

[Current Level: LV5]

[Materials required for upgrade: An elite alien crystal nucleus]

[Attributes: Strength 10, Agility 10, Endurance 8, Will 6, Resistance 6]

Sure enough, LV5 is a threshold, and the upgraded material directly becomes an elite-level alienation crystal nucleus.

The rest of the alienated crystal nuclei, Lu Cheng also used all of them to upgrade Zhang Xiaoyun's level.

After upgrading:

【Zhang Xiaoyun】

[Alien Virus Level: S Class]

[Current Level: LV4]

[Materials required for upgrade: 8 Alien Crystal Nuclei]

[Attributes: Strength 7, Agility 7, Endurance 8, Willpower 6, Resistance 6]

[Special Modifier: Sanity (S-Class): For some special reason, this mutant is able to preserve all memories and sanity, and can basically maintain human emotions, and minions with this type of entry will be more likely to awaken mind control skills. 】

There is still an alienated crystal nucleus left, Lu Chengcheng stayed, and it could be directly used as a physical strength replenishment potion at critical moments.

The attribute bonuses of the two minions were given to Lu Cheng's body, and the effect was also very obvious, at least now, Lu Cheng felt that his strength was infinite.

Everything was ready, and Lu Chengcheng sat by the window and secretly observed the situation in the apartment building opposite.

There are more and more zombies piled up on the fourth floor, and it is only a matter of time before they break through.

And as the sky gradually darkened, Lu Cheng could finally start acting.