Time passed minute by minute, and silently, the flying knife pierced through the heads of mutant beasts under the control of Shen Yan's spiritual power. The number of Level 4 Mutant Beasts far exceeded that of Level 5, but the difference of just one level made their defense much lower, and it was easier to kill.

Five minutes later, Shen Yan finally stopped killing, all the mutant beasts above level four that he could see in his eyes downstairs were all killed by him, dealing with these mutant beasts, if it was carried out according to the state he was not transformed, it would be extremely difficult. But now, it was solved in a few minutes, and he didn't even need to show up himself.

Roar!

The group of beasts roared, and as the fourth- and fifth-level mutant beasts died one after another, the group of mutant beasts downstairs finally exploded completely, and many different kinds of mutant beasts even began to bite each other.

"This ...... What happened? "The change in the mutant beast group attracted Ling Yan Thirteen's attention, the fifth-level mutant beast was not his soul control slave after all, and the death of the other party could not cause his immediate reaction at all.

The chaos of the mutant beast group spread very quickly, especially the mutant beasts on the periphery not only scratched, but even began to fight each other, they let out a roar, and struggled to pounce on the other mutant beasts who were still companions just now, as if they had seen several generations of enemies. The roars and the sound of fighting soon spread to the base, and the mutant beasts that were frantically attacking the city walls, many of which were natural enemies before the disaster, were now tearing each other apart as if the shackles that had been restraining them were loosened.

"Huh? How did these mutants start dog-eat-dog? On the city wall, Lei Zheng immediately discovered the changes of the mutant beasts, they who originally attacked the city wall, but at this moment, they actually began to fight each other, and even some mutant beasts began to devour those dead companions. The change was so fast that Lei Zheng couldn't believe it.

"Did the little wolf succeed and successfully kill that Ling Yan Thirteen?" Inside the base, the reaction of the mutant beasts was the same, they not only attacked Guan Feng and the others, but also attacked their companions, and the strict formation that had been maintained after rushing into the base also collapsed at this moment.

Inside and outside the base, the entire group of mutant beasts is as if the emperor in the human race has died, and the princes and ministers below have begun to fight for power because of the throne, there are roars everywhere, and there are scenes of flesh and blood flying everywhere. The killing at this moment was much more tragic and bloody than the previous killing of the human side and them.

Just by Shen Yan killing four fifth-level mutant beasts and more than a hundred fourth-level mutant beasts, the entire mutant beast group underwent earth-shaking changes, which Shen Yan couldn't imagine. According to his thoughts, even if he could succeed, the most he could do would be to make some mutant beasts out of control, thus affecting other mutant beasts, and finally reducing the pressure on the defense on the other side of the city wall, but what he didn't expect was that the entire battlefield had changed greatly in just a few minutes.

"Roar!" A long howl came from the side of the building not far away, and the sound came from Ling Yan Thirteen.

But his long howl only caused the mutants to pause slightly, and then they didn't react. However, the building where the other party was located was quiet, whether it was the mutant beasts gathered around him on the top of the building, or the mutant birds in the sky, there was not the slightest movement.

"Huh? Could it be ......" Shen Yan looked intently, and finally found that there was a fifth-level mutant beast on the roof of that building, which was a white-haired wolf with a silver horn on its head. Except for the color of his coat, he was basically the same as the one-horned wolf king he saw at the ruins of the warehouse.

"This wolf is so beautiful!" Shen Yan sighed in his heart, and couldn't help but ask Mira, "Mira, do you have a way to subdue this white-haired wolf king?" ”

"Just control it from the soul!" Mira replied casually, and suddenly paused: "Well, I forgot that the master doesn't know this control method, and although the master's spiritual power starts very high, in order to control such a low-level mutant beast, it is very cost-effective to consume a soul control quota." However, these mutant beasts have only become stronger, they are still animals in nature, and the earthlings do not have a way to domesticate animals, maybe they can subdue them in this way. ”

"Forget it then!" Shen Yan was a little helpless, he just suddenly saw that the white-haired wolf king liked it in his heart, but he wouldn't bother so much because he liked it, after all, the other party was a wolf, not a cat or a dog before the disaster, and he could raise it if he wanted.

Ling Yan Thirteen's long roar only quieted down the mutant beasts in the building he was in, and the mutant beasts around the building only stabilized slightly. But the first base of Fengcheng can't affect it, those mutant beasts that are fighting each other are still fighting, and those who devour corpses are still devouring.

"Whew!" A wolf howl sounded from the roof of the building where Ling Yan Thirteen was, and the sound was full of majesty, making the mutant beasts around the building, which were originally a little restless, suddenly quiet a lot. Even the mutant beasts on the other side of the base have some given up fighting.

"This white-haired wolf king is really good, under a roar, it can affect the mutant beasts on the other side of the base, if there is such a mutant beast by his side, will he encounter the mutant beast group again in the future, and the problem of a roar will not be solved."

Shen Yan sighed in his heart, but he knew that since the other party could affect the mutant beast, then he had to kill the other party. Immediately, he turned around and walked downstairs, he didn't want to rush to Ling Yan Thirteen to hunt the other party, but with his spiritual power as a basis, he could sneak into that building and carry out a sneak attack.

When I first saw Ling Yan Thirteen, the opponent's strength was only a fifth-level enhancement, and at that time, the mutant beasts that the opponent could control were only about 100,000. After a few months, the other party actually controlled six or seven hundred thousand mutant beasts and attacked the base. If you count the mutant rats that rushed up later and the mutant beasts around the building now, it basically exceeds 900,000, even if his control is achieved through high-level mutant beasts, it also proves that the other party's strength has been greatly improved now.

Shout!

Shen Yan stood on the first floor of the building and glanced outward, seeing that the mutant beast group outside the building had not been discovered, he immediately concocted the same method, as if he had rushed into this building before, opening the way with a flying knife, and he rushed out with all his speed.

A ...... Two ...... Twenty, in the blink of an eye, the flying knives pierced the heads of more than twenty mutant beasts under Shen Yan's control, and he also followed behind the flying knives and rushed all the way into the building where Ling Yan Thirteen was.

The building is not safe, and there are many mutant beasts inside. Shen Yan didn't stop, urging the flying knives to keep killing, and at the same time rushed upstairs.

"Roar!" The space inside the building was really small, especially the stairs leading to the top, which made Shen Yan finally forced to slow down while running, and was finally discovered by the mutant beast and let out a roar.

"Damn, this Ling Yan Thirteen is really cautious, and he actually placed so many mutant cats inside the building." Rushing to the fourth floor, Shen Yan was finally forced to stop by several mutant cats because of the slowdown in speed.

Shen Yan didn't want to stop killing, so that he might be discovered by Ling Yan Thirteen on the roof, so that the sneak attack would fail. But the environment inside the building was like this, and at the same time, there were a large number of mutant beasts who were good at speed stationed there, and it was completely impossible for him to rush to the roof of the building silently. Unless he controls the flying knife and kills all the mutant beasts layer by layer.

The three mutant cats let out a hiss, and pounced on Shen Yan at an astonishing speed, the sharp claws kept grabbing in mid-air, Shen Yan hurriedly dodged, and the dragon teeth in his hands were also waved instantly, and the flying knives quickly surrounded his body at this moment, quickly killing the mutant cats on the periphery.

"Poof! Burst! Burst! ”

Almost like lightning, the dragon teeth in Shen Yan's hand slashed three times, and the three mutant cats rolled directly to the ground, and they stopped moving after a little struggle.

"I wanted to sneak in, but I was stopped by you brutes." Shen Yan glanced at the corpses of several mutant cats and muttered, "It seems that it is impossible to rush, and you can only slowly approach it by cleaning it up layer by layer." ”

There were already roars of mutant beasts inside and outside the building from time to time, and if you didn't listen deliberately, you shouldn't have noticed it, which made Shen Yan somewhat happy. Shen Yan could only hope at this moment that Ling Yan Thirteen was concerned about the war on the other side of the base, otherwise he could only rush all the way up and forcibly attack!

The flying knife frantically slaughtered the mutant beasts on this level under Shen Yan's full control, while he himself avoided a room next to the stairs. In any case, he had to disappear into the mutant beast's field of vision in order to be better hidden.

The 500-meter-diameter bioradar was completely released by Shen Yan, and although the internal environment of the building was somewhat affected, the floor it was on was acceptable. A few minutes later, the hundreds of mutant beasts in the fourth layer were finally dealt with by Shen Yan.

In the dimly lit building, the killing continued.

Shen Yan no longer charged quickly, but slowly advanced upstairs with the killing of the flying knives, the speed seemed to be slow, but it was always moving. The entire building was ten stories high, and in the blink of an eye, Shen Yan had gone all the way to the seventh floor, and vaguely, he had been able to use bioradar to sense the life characteristics on the roof of the building.

8th Floor...... 9th Floor......

In the blink of an eye, Shen Yan had already come to the ninth layer. From the fourth floor to the present, the number of mutant beasts destroyed by Shen Yan on each floor of the building exceeded three hundred, and there were almost two thousand on the sixth floor, and a large number of mutant beasts died, making the building full of the smell of blood. Fortunately, Ling Yan was on the roof of the building, and Shen Yan thought that the smell inside the building should not be easy for the other party to detect.

"It's good to finally get to the ninth floor, and there is still one floor to go to the roof. Ling Yan Thirteen, I want to see where you run this time! Shen Yan sneered in his heart. But just as his thoughts were rising, a roar suddenly came from upstairs, and a white figure suddenly pounced.

;