Cillin had always suspected that there was something in the black rat leader that would make it change like it was. Mutation is one thing, but it is followed by a period of stability. But a black rat like this one underwent a second mutation not long after the previous mutation, and the mutation was so successful, that its intelligence and combat power seemed to have been accumulated over hundreds of years, and I really hadn't heard of it.

Who is more sophisticated, a rat that is still strong at hundreds of years old or a rat that is a year old? The results are clear.

When Xilin tested the traces left by the black rat before, he found that there was a strange substance in the cells of the black rat, or rather, it may be that there is something in the body of the black rat, which stimulates the cells in various parts of the black rat's body to produce strengthening substances.

It wasn't until the black rat appeared that Xilin clearly felt the special information emanating from its body, and that kind of information made the chip in Xilin's body very excited, as if he had found a similar kind.

The two pairs of incisors of the huge black rat leader were like large scythes, and his mouth emitted a rat-like snort. It was aware of Xilin's existence before but did not immediately attack, he felt that this human gave him a very special feeling, a faint sense of crisis, but at the same time there was a temptation like a good meal, perhaps, eating this human is good for its evolution, after enduring it for so long, he finally decided to start.

The black rat disappeared in place, and the next moment he went out in front of Da Xilin, and Xilin was not slow to react, the gun and backpack were already put aside, and he dealt with it with his bare hands.

The collision between the solidified body and the black rat made a muffled sound, and at the moment when the black rat's paw waved, Xilin quickly bounced up and kicked at the black rat's cervical vertebrae.

Boom!

The cervical vertebrae of the black rat were not broken, but the upper body of the head was knocked to the side with the force, and the stone wall where it was hit was dented, and the shattered rock fragments fell.

The rocks on the cave wall are like tofu under the claws of the black rats, and the hole expands under the constant impact of the black rats, and the stone chips are splashed.

After so many contacts, Cillin already knew the location of that thing in the black rat's body.

Whoosh –

The two mouse claws were thrown at the black mouse's blood-colored eyes, the black mouse closed its eyes, its head was slightly tilted, and the two mouse claws thrown out by Xilin hit the corners of the black mouse's eyes, and even the skin of the black mouse was not cut. But the rat's claw, which had been thrown out as a hidden weapon, was only a cover-up, and Cillin's next target was its ears.

At the moment when the black mouse closed its eyes, Xilin threw out two rat claws at the same time, towards the ears on the left and right sides of the black mouse. With such speed and force, if it really shoots into the ear, even if the pinna is hard, the inner ear and nerves deep in the ear canal will be damaged.

The big black rat also knew the consequences of being shot, so while closing its eyes and dodging the first two mouse claws, the two forelimbs of the black rat were raised, and the sharp claws blocked the hidden weapon that shot over.

This is the time!

Xilin jumped diagonally and flew under the black rat's front paws, and the solidified arm penetrated through its abdomen, and at the same time, the arm sucked the thing inside out of the black rat's abdomen like a magnet, and quickly pulled away and jumped away. The whole process is only in a split second.

It was a fist-sized ball of crystal white, glowing white in the darkness. Holding the white ball, Xilin could clearly feel the huge energy coming from it. But now is not the time to study this white ball, Xilin quickly withdrew after getting the thing, and the fool fought hard with this big guy.

The wound on the black rat's abdomen caused by Cillin's arm did not bleed much, but began to heal immediately, but the recovery effect was not as good as when the white ball was present, and the healing speed was slower in comparison.

After perceiving that the white ball was taken away, the black rat went crazy, his bloodshot eyes became even redder, and he screamed angrily, and his two pairs of sickle-like incisors glowed with the anger and murderous intent that had reached the peak.

It can not care about revenge, it can not care about the life or death of other black rats, but it can't lose this white ball, all the reliance, all the opportunities, all this white ball!

The black rat chased Xilin like crazy, every time he ran a step, the long and sharp claws lifted a large piece of the stone layer of the cave, the black rat didn't even bend, and directly found the shortest distance to chase in a straight line, which shows its eagerness. Many parts of the cave were destroyed, and the path of the black rat and Sirin began to crumble.

The route of the cave chosen by Xilin was almost devoid of other action team members, and the movement made by the black rats was very large, and the nearby operators were also vigilant, and they all began to quickly evacuate to the ground after noticing that the cave was beginning to be unstable.

Xilin had already formed a clear and complete cave network system in his mind, and he knew when to run which fork in the road. The route passed through most of the caves, including the places where he had dealt with the hidden killers, and the collapse of the caves buried the last traces.

The longer it dragged on, the more the black rat felt weak and restless when it left the white ball. But the human who took it was also very fast, and as it ran, the black rat let out a long howl, not like a rat, but more like those ancient beasts.

The howl caused the entire network of underground caverns to shake, and even the operatives on the ground who were fighting with the black rats could clearly hear it.

Like a long howl in the cold wind, it is like the sound of Shura walking through hell. At this moment, the action personnel and researchers who heard this voice all had a shuddering feeling.

What kind of creature can make such a sound? Under what circumstances and in what state of mind did this creature howl hysterically?

At the sound of this sound, all the black rats on the ground, whether they were fighting with the action team, or those lurking somewhere in the base waiting for an opportunity to attack, or those who were almost about to break through the last layer of protection in the center of the base, all stopped what they were doing and went underground. Even if the operatives swept them at gunpoint, they did nothing.

"Inform the team members who haven't come up from below the ground to evacuate the cave quickly! People on the ground are on high alert!! Huo Ding yelled into the communicator, although he didn't know what was going on, but listening to the voice, it was obvious that the leader was coming.

Somewhere in the underground cavern, a group of personnel were walking forward, before they lost contact with the ground, and the communicator did not have the slightest signal, but seeing that the cave was becoming more and more unstable, the team leader decided to leave first, otherwise they would be buried here. Especially after hearing that terrifying howl just now, I was even more determined to evacuate.

"Team leader, there's a signal!!" One of the team members exclaimed with joy.

The closer you get to the ground, the farther away from the previous location of the Black Rat Leader, the more previously installed receivers remain. Not only this group, but also the operators who evacuated from the underground to the top also found that the communicator had a signal.

"All underground operations are evacuated to the surface immediately! Evacuate to the ground now! ”

Huo Ding's voice sounded in the communicator, and he was eager.

"Withdraw!!"

The team leader immediately gave the order.

But before they could take two steps, they felt a vibration from far and near.

"Be on guard!"

All the crew members raised their guns and were ready to shoot. But everyone understands that the number of black rats with such a vibration sound is definitely not something that a few of them can bear.

Withdraw? It's useless, his cave is very long, and they are only draining their physical strength and delaying the collision time between the two sides now.

I had never encountered such a large number of black rats when I first entered the underground cavern, but now it seemed as if the black rats were gathering together and rushing towards them, and the sound of their running was undisguised, not as hidden as when I had fought with them before.

Thatch is also a member of this group, and now he can't care about wiping the sweat from his forehead, and he thinks back to what he has experienced when he has grown up so big, and his dreams have come to Qiyao with great ambition...... Regret it? He asked himself.

I don't know, I really don't know. I don't have anything else in my mind now, but I remember how I felt when I was young and looked at the golden medal with the military insignia in my father's study. Perhaps, since then, there has been an obsession in my heart, when, I will get one myself, and it is not his father's name that is written on it, but he Thatch.

The black rats were already near, and the group members could already smell the disgusting breath coming from the air.

"For glory!"

"For glory!!"

The team members shouted this sentence to the group leader, and then clenched the guns in their hands.