"This scream, it's it, that's right, it's No. 857!" After

hearing the scream, Professor Chen's feet went limp, and he collapsed to the ground.

"It's over, it's all over, as long as it's alive, we're going to die sooner or later.

The other survivors of the lab building let out a sigh as well.

It is clear that they have lost the motivation to flee.

"What the hell is going on, Professor Chen, tell me quickly.

Sun Xiao wanted to ask Professor Chen, but the other party didn't say a word, just kept shaking his head.

Seeing that it was useless to ask, Sun Xiao scolded in a low voice.

then walked up to Xu Xing and gave her a slap.

"Smack!"

Because he was too hard, Xu Xing was directly fanned to the ground.

Lin Wei hurriedly helped him up, and raised his hand to hit Sun Xiao.

But after seeing the killing intent on his face, his arm stopped in the air, not daring to move a single bit.

Fortunately, Sun Xiao's slap woke Xu Xing up.

She gradually recovered from her slumber and said tremblingly.

"BD857 is one of the test subjects that Professor Chen led our team to conduct experiments, and it was originally ......"

"Talk about the point!"

Covering his head, the fear on Xu Xing's face almost overflowed.

"After the end of the world, many rats have mutated, and No. 857 is one of them.

"I've seen it with my own eyes, leading other rats, preying on zombies and humans.

"No. 857 has a huge appetite, not only meat, but even hard bones are its food!" Hearing

Xu Xing say this, Sun Xiao's eyes suddenly shrank into the tip of a needle.

He had never encountered anything so ferocious.

Compared to the so-called 857, the zombie who only eats meat is as cute as a domestic kitten.

Hiding in the shadows, Lin Yuan also listened to Xu Xing's description.

Immediately after, a solemn expression appeared on his face.

He thought of a mutant rat.

Different from the rat colony that was eliminated before, this mutant rat is an extremely special existence.

Just

like the new humans among the humans and the xenomorphs among the zombies, there are very few mutant creatures with abilities.

Such a special being is called a "leader creature".

Each "leader creature" occupies a certain area and commands mutant creatures that are weaker than themselves.

The steel bone rat is a type of leader creature that is mutated from a rat.

Even among the "leader creatures" of rodents, they are extremely rare.

He likes to eat meat and is more bone-loving.

It doesn't matter what kind of species the bones are, it's all on its recipe.

Wrapped in white bone armor, it was indestructible, and most pistol bullets could not penetrate this layer of defense.

Each steel-boned rat can be said to be a miniature version of an armored vehicle.

Ordinary humans and zombies can't even dodge a charge in front of it.

Thinking back to the information about the "Steel Bone Rat", Lin Yuan muttered.

"I see, since it's a steel-bone rat, it can explain the strangeness of the laboratory building. "

Ordinary mutant rats eat meat, and the bones are digested and absorbed by steel-boned rats.

And because the bone armor is too heavy, the steel bone rat will stay in a quiet place most of the time, waiting for other mutant rats to deliver food.

As for its location, it is the laboratory on the first floor.

Lin Yuan and the zombies entered the experimental building and were treated as enemies by it.

That's why the rats emerge from the pipes in the ceiling and attack.

And this behavior of burrowing through the gap is even more regarded as a provocation by the steel bone rat, which is why the injuries on the shadow walker are so serious.

"I didn't expect it to be a rare commodity like a steel bone rat. There

was a joy on his face, but Lin Yuan quickly regained his composure.

"As long as I kill it, my strength will be able to go further. He

pushed his glasses, and his eyes lit up.

Just now, he sent the Shadowwalker back to the lab, where he continued to stimulate the leader creatures inside.

The Steelbone Rat who had just fought with the Shadow Walker, but didn't kill it, was already angry.

Seeing this enemy come back to provoke, he naturally will not let it go.

At this time, the boxers who go downstairs will bombard the cabinet until it collapses.

Once in the lab, the boxers join the fight.

The Steelbone Rat is stronger than a single xenomorph zombie.

But in the face of two xenomorph zombies, it is impossible for it to kill them all in a short time.

And as long as it was the time specified by Lin Yuan, the two zombies would quickly evacuate.

After being attacked continuously, coupled with the death of his own kind, the steel bone rat has only one option: to attack on its own.

When it reaches the fifth floor, it will naturally attack Sun Xiao and the others.

In the face of the steel-bone rat, Sun Xiao and others could only fight back.

As for Lin Yuan, he only needed to come out to harvest at the end.

This is a plan to kill people with a knife.

As Lin Yuan thought, it didn't take long for the screams downstairs to get closer and closer.

Sun Xiao and the others hurriedly prepared for battle.

Even Professor Chen and others were woken up from their sluggishness.

"It's close!" it

didn't take long for the screams to be heard from the second floor to the third floor, then the fourth floor.

Eventually, a figure emerged from the stairs on the fourth and fifth floors.

"Zombies?"

Looking at the tall zombies in front of him, Sun Xiao was stunned for a moment.

It's not just because the other party is the first zombie he saw after coming here.

What's more, that scream couldn't have been made by a zombie.

Just when Sun Xiao and the others were puzzled, Lin Yuan gave an order again.

The boxer, who had just reached the fifth floor, suddenly stopped, turned around, and rushed towards the corridor next to him.

Under the shocked gaze of Sun Xiao and the others, it shattered the glass and fell downstairs.

"Zombies, jumped off the building?" the

corners of his mouth twitched fiercely, and Sun Xiao didn't understand what was going on at all.

A member of the search party stepped out of the group with courage.

Come to the hallway and look down.

"It's weird, could it be that zombie in bib pants has a bad brain?"

As soon as he finished speaking, he heard shouts coming from behind him.

"Be careful!" the

team member subconsciously looked back.

But before he could react, a figure that was even larger than before pressed him under him.

Claws covered in white bone armor struck and slapped at his head.

"Bang!"

The next second, the team's head was blown up like a balloon that had been pricked by a needle.

The steaming blood splattered everywhere, and a few drops of white thick even flew onto Sun Xiao's face.

His eyes widened, and he could see the creature in front of him.

The giant rat was nearly three meters long, and its entire body was covered in white bone armor.

The scarlet eyes flashed with a crazy light, and against the background of the blood around them, it made people shudder.

The tail behind it swayed slightly, and the bone armor covering it made it look like a whip.

Steel-boned rat, debut.

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