After waiting for a few minutes, there was no sound of rolling stones, and Xu Xin and the four stone statues emerged from the small hole.

Chang Yin patted the wall again, and the originally concave hole gradually became shallower, and finally returned to its original smoothness.

"Obsessive-compulsive disorder, I can't bear to leave a hole in the wall." Changyin spread his hands and explained.

Xu Xin pointed to the back, which was blocked by several huge rolling stones: "It seems we can only move forward."

"Why, you still want to go back?" Changyin glanced at the rolling stones behind him and said nonchalantly, "If you really want to go back, I can take you back. How can a stone block my way?"

Xu Xin understood. Changyin's ability seemed to be to control rocks. Although it might not be able to stop the rolling rocks, there was no problem in breaking the stationary rolling rocks into eight pieces.

"Are there any agencies ahead?" Xu Xin asked.

"No more," Xue Lan held the small hand of the little boy's stone statue, "Last time, we only had this kind of mechanism until the first door, and the rolling stone only appeared three times."

Continuing to move forward, they didn't go long before they caught up with the mutated cheetah lying on the ground waiting for them to catch up.

Xu Xin passed by the cheetah and subconsciously wanted to touch the big cat's head, but it easily dodged it and followed him silently at a distance of two meters behind him.

There was no other way, Xu Xin could only touch the little head of Keke who was sleeping on her shoulder with itching hands. Keke twisted slightly, made a "beep" sound like talking in his sleep, and continued to sleep beautifully.

The tunnel became wider and wider.

Xu Xin could already see a gate not far away.

It was a door similar to the entrance to the dungeon, but it was a few times larger, so big that it looked like the door of a castle.

Several people quickly arrived in front of the door. Chang Yin first tried it by himself, but no matter how hard he tried, the metal door remained motionless.

Xu Xin looked up and found a downward-opening hole directly above the hole. The size was similar to that of a rolling stone. It was probably where the rolling stone came out.

At this time, the previously contracted bat came in handy. Xu Xin turned the ring with her thumb, and the mutated bat appeared in front of Xu Xin.

"Huh? You have contracted a bat." Changyin looked at the big bat with some surprise.

"Go to the cave above to see if there is anything you can bring down." Xu Xin first directed the bat to fly into the cave above, and then answered Chang Yin, "It will be much more convenient to have a flying bat."

"Hmm... Indeed, but the strength of this bat alone is very average. You need a lot of them to have any combat power."

After Xu Xin inquired, he learned that these bats were actually the failed products of Changyin's experiment.

The current [Mutated Beast Potion] is the final version debugged by Changyin and Xuelan through various experiments. The initial effect was very weak, and the bats in the staircase passage were the original test subjects.

After taking the initial experimental medicine, the bat group did mutate and possess certain special abilities. However, the ability of each bat was too weak, and a group of bats must work together to improve their abilities.

appear.

Xu Xin had suffered losses from a group of hundreds of bats. Recalling the feeling at that time, his head even felt a dull pain again.

"The ability of bat swarms is ultrasonic waves that can affect people's minds." Xuelan also knew the test subjects very well and explained to Xu Xin, "But a single bat is of no use. It is just a little bigger than ordinary bats and has a longer lifespan.

That’s all.”

Before Xu Xin could say anything else, the bat that flew into the cave above flapped its wings and flew down, holding a red stone the size of a walnut in its claws.

"Look, doesn't this still have some effect?" Xu Xin reached out to catch the small round red stone, and with a focused gaze, he discovered that the stone was actually emitting blue light.

It is actually a blue grade stone.

[Contaminated Radiation Stone (Blue): Emits special radiation with a radius of ten meters. Mutated beasts affected by it for a long time will become stronger! Don’t worry, this radiation is harmless to normal people and normal beasts. 】

When Xu Xin saw the word "radiation", he almost threw the stone away. Only after seeing the introduction later did he feel relieved.

After understanding the function of this stone, Xu Xin couldn't help but smile. It was actually a prop that could make mutated beasts stronger! This was simply what he wanted.

The mutated cheetah is now just on the edge between low-level and intermediate-level. As long as it becomes stronger, it can be directly upgraded to an intermediate-level beast! And the stronger bat can also play a greater role.

I didn’t expect to find unexpected surprises here.

"Why, is this stone useful?" Changyin asked, looking at the stone in Xu Xin's hand.

"Nothing, a stone that can be used to make weapons." Xu Xin put the stone into his backpack.

"Weapons, that's boring. My body is a weapon. Okay, just push the door open." Chang Yin pointed to the door in front of him.

Xu Xin walked to the door and reached out to touch the door.

"Huh?" A familiar feeling rose from the bottom of my heart. This feeling was...a tree house?

It's like pulling on the fibrous roots of the tree house, that feeling that seems to be integrated with itself. Could it be said that the roots of the tree house are affecting the door here?

With a gentle push, the huge double door slowly opened toward the inside. Xu Xin quickly hid aside, fearing that something would come out of the door.

Behind the door, there is still a tunnel-like spacious corridor. The difference from the previous section is that the ground in front is paved with black stone bricks and white stone bricks alternately. Each stone brick is about one meter in length.

Square, the whole road presents a scene of black and white grids everywhere.

"Trap?" Xu Xin expressed his guess.

"That's right." Changyin pointed to the two colored grids on the ground, "Each grid may be a trap, but it may also be safe."

Xuelan also spoke: "There are many types of traps, and it's basically impossible to predict what kind they will be, so even being prepared is basically useless. The collaborator twenty-four years ago just didn't listen to our dissuasion and thought he had it.

All the traps, forcing him to move forward recklessly, allowed him to pass a long way, but in the end he fell into a trap similar to a meat grinder, and the result..."

Xue Lan didn't say anything, but Xu Xin could imagine the scene at that time and couldn't help but feel a chill.

"What is this trap triggered by? Is it weight?" Xu Xin asked.

"It would be easier if it were weight, but it doesn't seem to be the case. I can't trigger the trap with a stone that weighs about the same as a human being. Maybe the condition is that it must have vitality." Changyin said.

"Then...are you planning to use mutated beasts to navigate the mines?" Xu Xin guessed what Chang Yin was thinking.

"That's right." Changyin waved his hand and released a trembling mutant blood-striped wolf.

"Aren't you going to release a few more?"

"Put out more and let the trap kill several at once?" Changyin said angrily, "I only brought a dozen, but it's enough. Most of the grids are safe, and only a small part will trigger them.

Trap, only seven died last time."

You really have to work hard to build this trap road.

Xu Xin turned his head, and the cheetah was lying two meters away from him.

"You are not allowed to run around for a while. You can only step on the squares we have stepped on. Do you hear me?" Since there was no way to put it into the ring, Xu Xin could only warn it.

The cheetah glanced at him and licked its fur, wondering if he understood.

"Okay, let's go. With its speed, it might be able to avoid even if it steps on a trap." Changyin directed the mutated blood-striped wolf, letting it walk forward on a stone brick until it walked towards it.

After walking seven or eight meters, Changyin stepped onto the black and white stone bricks.

Xu Xin just wanted to step forward, but was blocked by the stone statue of the maid.

"We can block the mechanism for you in front. There will be some mechanisms with crossbows exploding and spitting fire. The range is very large. It will be dangerous for you to walk in front." The middle-aged maid stone statue suddenly spoke. She didn't say much along the way.

I have been taking care of the stone statue of the little boy.

"Oh, okay, thank you." Xu Xin let the maid Xuelan and the little boy pass first.

The blood-striped wolf at the front seemed to be controlled by the long seal. It did not run around, but walked straight forward.

"Be careful, don't accidentally step on the stone bricks nearby, triggering traps such as explosive crossbows, we don't care, just be careful to hurt yourself." Xue Lan reminded Xu Xin.

The stone statue of a little boy who originally liked to run around was walking very obediently along the road that had been trampled by wolves. Hearing Xuelan's words, he nodded sharply: "Yes, yes, uncle, please don't run around. It's very dangerous."

scary!"

Probably the person from before left a shadow on him.

"Okay, thank you." Xu Xin thanked them, followed the stone statues in front, and stepped on the stone bricks.

The moment he stepped on it, Xu Xin found that the stone brick had been stepped down by about half a centimeter, making a slight friction sound. His body immediately tensed up: "What's going on? Why did you step down?"

"It's all like this." The maid stepped on a brick in front of her, and that brick was also stepped on. "These mechanisms are of prompt type and delayed type. Spike traps and meat grinders are prompt type.

, it will step on the air and fall directly. The delayed type is like this. Step on the stone brick and lift your foot, and the mechanism will be triggered."

As she spoke, she moved a stone brick forward, and the stone brick bounced up and returned to its original shape.

This is to allow ordinary bricks to have mechanisms like trap bricks to paralyze the vigilance of passersby. Xu Xin couldn't help but sigh, this trap road is indeed difficult to walk, much more difficult than the trap Li Wenxi said.

In the tunnel, the sound of stone statues stepping on the ground and the sound of floor tiles rising and falling echoed. Xu Xin glanced behind him and found that the cheetah was walking very standard cat steps behind him, following the path Xu Xin had walked.

Looking at the situation, instead of worrying about the cheetah, it is better to worry about whether I will fall to the ground and fall to the side.

Suddenly, the mechanical sound of a mechanism being triggered and the pitiful howling of wolves came from the front.

The mechanism is triggered!

Xu Xin looked sideways and saw that the blood-striped wolf had disappeared. There was no brick where the blood-striped wolf had been. Changyin, who was seven or eight meters away from the blood-striped wolf, quickly moved forward and came to the trap brick.

, stretched his head and looked into the trap.

"How is it? What kind of trap is it?" Xu Xin asked from behind.

"Spiked trap, the wolf is dead."
Chapter completed!