Liu Beep jumped down directly, the knife in his hand was directly inserted, and a zombie was killed by Liu Beep, kicking the zombie that pounced on him away, and then he flicked another zombie who pounced on his head off.

"Roar!" The zombies all came around, but at this time, the other people also came down, and the flames in General Lu's body burst out, and then he rushed towards the zombies with two axes in his hand.

General Lu brandished a double axe to kill all the zombies who approached, General Lu led the others into the zombie group, and Liu Beep led a group of people to kill from the outside.

The zombies in the distance were bombarded by mortar artillery, but this very tall and fat zombie appeared in the zombie group.

"What's that? Is it a mutant? Aim at that mutant and shoot. Seeing this mutant, Qi Fei thought of attacking this mutant first.

Hearing the command, the following began to adjust again, and then fired at the mutant.

This mutant Huang Nan should know, this is the special mutant they accidentally created with artillery at that time, this mutant has no scales on it, but after a period of precipitation, the IQ of this special mutant is already about the same as that of ordinary mutants.

And he can still talk now, you know, this mutant couldn't speak when he first came out.

At this time, Liu Beep also saw this mutant, although the appearance was similar to what Huang Nan said, Liu Beep still recognized this mutant.

"I'll go, I remember this mutant can be an air cannon, right?" At this time, Liu Beep suddenly remembered that this mutant seemed to have an ability similar to that of an air cannon.

Sure enough, the mutant stopped when it reached a certain distance, took a deep breath, and then spit it out again.

"Hide!" Liu Beep shouted at it, but it was too late, the air cannon smashed directly on the urn city wall, part of the city wall was directly broken, and Liu Beep also saw several people being blown away.

"Get out of here." Qi Fei saw that this was not going to work, so he immediately took the person down, and rushed down directly with the weapon, there was no way, if he continued to stay on it, he would definitely be targeted by that mutant.

"Damn." After seeing Qi Fei and the others coming down, Liu Bi looked at the mutant that was getting closer and closer with resentment.

There is no way but to continue to kill the zombies with the knife in his hand, but without the support of artillery fire, there are more and more zombies, and the zombies who have almost been killed by Liu Bi and them also began to counterattack at this time, before the zombies were surrounded like this, and now they have come to surround Liu Beep them.

"No, hurry up and retreat." At this time, Liu Bi could only retreat helplessly.

Hearing Liu's words, he quickly climbed up the rope left before, followed the rope to the urn city, and then went down the urn city.

The zombies began to destroy the urn city, and at this time, the mutant also arrived.

One air cannon broke a piece, and after a few air cannons, the urn city was already in tatters, and the urn city was breached for the second time.

And at this time, Liu Beep, they have returned to the shelter, and a lot of preparations have been made in the shelter, and there are also a lot of fortifications that have not been damaged before, and the mortars that have not been damaged before have also been brought back, and even the first and second floors of the basement are now no one, although your ground is strengthened, but considering that the destructive power is not ordinarily strong, it is better to be careful.

The people inside the shelter are waiting, and those outside seem to have attacked the gate of the shelter, the gate of the shelter has been strengthened several times, and now the defense is already very high, and the zombies have been attacking but have not caused any damage.

At this time, the mutant arrived, and an air cannon punched a groove in the door of the shelter, which could have been destroyed after a few visits.

"Isn't the system good yet?" Liu Bi anxiously asked the system, but the system's answer was still the same 99%.

"When did you still play this kind of!" Liu Beep was very angry, but he was also very helpless, but the system always said that 99% was not wrong, it was all in production before, and now it is being assembled.

This is a giant cannon deduced by the system according to the mortar, the power is much greater than the mortar, the range is also long, and it will not mutate the zombies, but it is also today, when Cai deduces it, it will take a little time from manufacturing to assembly.

In other words, the system extracts a part of the energy from the zombie crystals to upgrade, and the current system can do more things, so it is said that the current deduction and the ability to analyze weapons before are both recent abilities.

But now Liu Beep is still very anxious, the zombies outside will come in at any time, but he can't do anything, he can only hope that the gate will hold on for a while and wait for the system to assemble the giant cannon.

It's a pity that things are not so good, with a bang, the gate directly broke a big hole, and a large number of zombies rushed in, and Qi Fei immediately ordered the launch.

A bunch of shells were fired, and the shells exploded at the gate, and a large group of zombies were killed.

But there are more and more zombies in the back, and the mortar also needs a certain amount of time to reload, and soon the zombies came to them, and at this time, the second shell of the mortar was fired.

"Melee!" General Lu yelled and rushed forward with him, while the rest of the group retreated with mortars, and there were several defenses behind them.

Then the cannon was re-erected, and General Lu also led the people to slowly retreat, and then the mortar was fired again to take away a wave of zombies, and at this time, the mutant could not enter the shelter because of his height, and began to attack the wall of the shelter outside.

Suddenly, something seemed to open on the roof of the shelter, and the mutant saw a sci-fi cannon appear in front of him, and a huge cannonball was filled inside.

The mutant seemed to see danger and wanted to climb up and destroy the cannon, but with a bang, the cannonball went out, and a very large cannonball rushed straight towards the mutant, and the mutant wanted to escape, but how could his speed be as fast as the cannonball.

With a bang, the mutant was blown to pieces, and a large hole was blown open in the walls of the Vault on the ground.

"Quickly the mutant is dead, everyone rushes forward."

The system informed that the mutant had died, and Liu Beep immediately rushed up with them to drive the zombies out of the shelter.

But what he didn't know was that a pair of eyes were watching them inside the zombie group.