Du Di'an, Sham, and Zach's eyes fell on this dark blue ball, and couldn't help but stunned, a ball fell out of the head...? This ball is naturally perfectly round, and the color is dark blue and beautiful. Obviously, it is not a hardening of intracranial tissue, but looks like a blue metal ball.

It's just, how can there be metal in the biological brain?

Du Di'an was in shock, but he didn't touch it with his hand, but lightly poked the ball with a short sword. The tip of the sword stabbed on it and immediately slipped, pushing the ball to the broken neck of the walking corpse.

so hard! Du Di'an's eyes moved, the activity of hard objects was poor, the infection rate was slow, and it would not penetrate like a liquid. He had the isolation of gloves. If it was simply touched, it should be fine, and he immediately reached out and picked it up.

As soon as he caught this dark blue ball, Du Di'an felt a shock all over his body, and there was only one feeling coming from his finger nerves, which was cold!

Extremely cold!

Like holding a puck, he couldn't help but think of the frozen blood in this row of corpses. Could it be because of this dark blue ball?

At this time, the cold air seemed to spread, and climbed along the dark blue ball to Du Di'an's arm. He felt that the temperature of the whole arm was dropping sharply, and it was a little stiff. He couldn't help but put the dark blue ball on the other hand. Quick, this other hand also feels a little frozen. At the same time, Du Dian feels cold all over his body, as if he is in the black snow season, which is extremely cold.

"How come, even if you hold a piece of ice in both hands, it's just frozen hands, how can you feel cold all over your body and feel cold from the soles of your feet." Du Di'an was a little surprised. It was like playing snowballs in winter. It was cold, but his body was warm, but at this moment, he felt cold all over his body, as if his whole body was stuck to a piece of ice.

He immediately put the dark blue ball on the ground, rubbed his hands with each other, and breathed a little, and then he felt a little warmer, but soon he felt a hunger in his stomach. He has not eaten since he was outside the giant wall. Something, he endured it, suppressed his hunger, and looked at the dark blue ball in puzzlement. Suddenly, he thought of a reason.

"Endothermic!" Du Di'an woke up, "This dark blue ball will absorb heat, just like saltpeter in black powder. Saltpeter is not only one of the raw materials of black powder, but it can also make ice. In this world, most alchemists Warlocks have only mastered the use of saltpeter to make ice, but they have not yet discovered that saltpeter mixed with sulfur can explode..."

Saltpeter makes ice because it absorbs the heat in the water, so the water freezes into ice.

And he felt cold all over his body just now. Obviously, this dark blue ball also has the same heat absorption function as saltpeter. If you hold it in your hand, it will absorb heat along the arm until it absorbs all the heat of the body. The body temperature will also decrease. When it drops to a certain level, the heartbeat will naturally stop and freeze to death.

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"No wonder, no wonder the body temperature of these walking corpses is so low and cold. It turns out that this thing is doing the trick, but how did this thing come from and why did it appear in the mind of the walking corpse?" Du Dixin was full of curiosity, If it is said that someone has colonized their brains, it is naturally unlikely. After all, there are so many zombies, and how much energy and time does it take to colonize one by one?

"If it wasn't artificially colonized, it would have grown by itself. However, although the walking corpse is a human being infected by a virus, it is still flesh and blood. How could such a hard metal-like object grow, and it also has such strange characteristics ?" Du Di was in a strange mood. At this moment, a figure suddenly jumped down from the stairs, which suddenly alarmed several people in the room.

After seeing that it was Macon, several people were relieved.

Seeing that the three of them were there, Macon was relieved and said, "Scared me to death, I almost thought something happened down there."

Sham scratched his head and said, "I saw Dean's anatomy fascinated, and I forgot to inform you."

Zach reacted and hurriedly said, "You're down, what about those walking corpses?"

Macon rolled his eyes and said, "Of course I'm back again, I'm exhausted, you can change it."

"I'll go." Sham looked at the walking corpse whose head had been chopped off, only to feel the tumbling in his stomach, and said immediately.

Du Di'an was interrupted by Macon, and he continued to think about it, but he had no clue. He couldn't help sighing, and stopped digging in this area. The most important thing is to survive right now. Suddenly, his eyes lit up, and he immediately turned to Zha. Qi and Macon said, "Come with me and go downstairs."

The two were a little confused, but they followed.

Du Di'an came downstairs and saw that the group of walking corpses outside were led away, and immediately sneaked to the corner, cut off the heads of the two dead walking corpses with a dagger, and then quickly ran back with their heads in hand. The building, seeing Macon and Zach immediately retreating, smiled and said, "It's okay, they're all dead."

Macon said in horror: "You, when did you get so daring?"

"Just wait until you get used to it." Du Di'an said, returned to the upper floor, and split the heads of the two walking corpses according to the previous method. He cut it open, and as he expected, there was an identical dark blue ball inside.

When cutting the third head, Du Dian suddenly thought of a problem, and immediately stopped the previous rough cutting method, but slowly opened the head along the cracked position of the skull, and soon, he saw the picture inside the skull, Unsurprisingly, the brain tissue inside the head was also extremely cold, as if it had been frozen, and the dark blue ball was lying in the brain tissue package.

However, probably due to the crack of the skull, the brain tissue at the dark blue ball was somewhat damaged. Du Dian searched carefully for a while, and soon realized that this dark blue ball was the main reason for controlling the action of the walking corpse!

There are two reasons for the so-called destruction of the head to kill the walking corpse. The first is to destroy the central nervous system in the head, so that the head cannot control the body. The second is to destroy the connection between the dark blue ball and the brain tissue in the head. The place!

To put it simply, this dark blue ball is like an ovary in the brain tissue. It is not necessary to destroy the head to kill the walking corpse. As long as it is a strong shock, the dark blue ball will be shaken out of the ovary of the brain tissue, so that the If the dark blue ball loses contact with the nerves in the ovarian wall, it can stop the walking corpse from moving, that is, kill the walking corpse!

After understanding this, Du Di'an became more and more puzzled. What is this dark blue sphere, and why does it grow in the brain of a walking corpse? Is it made by a virus? So, isn't this dark blue sphere a virus condensate?

Thinking of this, Du Dian immediately rolled the dark blue ball with the picked up fabric layer by layer, wrapped it into a fist-sized ball, relaxed a little, and then handed two to Macon and Zach, saying: " This thing can absorb body temperature and help us reduce body temperature, but don't hold it all the time, it will absorb body temperature, it is best to put it in a backpack."

Macon and Zach looked at these two things wrapped in layers in surprise, Macon asked curiously: "What is this?"

"I don't know, but after those hunters kill the walking corpses, they will dig out this thing in their heads, indicating that it should be very valuable, otherwise these hunters will not turn a blind eye to gold and other things, and go to dig it out. Take this thing." Du Dian said, he has seen many walking corpses with their heads split open, but none of them have this in their heads, so it can be seen that they have been picked up by hunters.

Macon was shocked: "You said that hunters kill walking dead, just for this?"

"maybe."