The crystal hall at the bottom of the fortress is the core of the clan with extraordinary life.

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Previously, when she followed the flying machines that had changed into diving mode in the boundless underground ocean of the Abyss Star and gradually approached this underwater fortress that looked like a giant spinning top in its overall shape, Xinglan had already noticed that there was a huge spherical bulge with a diameter of hundreds of meters at the bottom of this object, but at that time she was completely unaware of how special this position in this deep sea fortress was for the people of Tianyuan, until the recovered Blue Sky and Qi Qi arrived here with a container containing the corpse of the Moon Prayer Man, she learned that this was the destination they had come all the way to. The passage to the ground floor inside the Abyssal Fortress is an elevator-like device, except that the interior of the elevator hall is spacious. When those accompanying abyss ghosts cautiously opened the elevator door to the ground floor, Xinglan even found that Qi Qi's body was trembling slightly.

Is it out of excitement? Or is it out of fear? Or ...... Something that was difficult for him to explain, in comparison, Qingkong was much calmer, she had completely recovered her body, and her eyes were open all over her body to look around, just at the end of the passage ahead, the lowest level of the deep sea fortress, where the central brain was located.

The elevator used by the people of Tianyuan is similar to the elevator of the earth civilization, but the protective ability of this elevator seems to be extraordinarily strong, and the thick metal wall even gives people a feeling...... This place may be able to withstand a nuclear explosion. The whole descent process didn't take long, but the protective measures along the way were extremely troublesome to unlock, and Qi Yu said to Qingkong in a joking tone when unlocking the passage: "These levels, which everyone knows will not be useful, have they been left here and not taken for recycling?" ”

The other people of the Abyss didn't react to this, as if they had become completely accustomed to it, and Xinglan captured the crux of the sentence: security measures that would not be of any use. She had a feeling that this statement might have a lot to do with the central brain.

Of course, those abyssal ghosts also went with them, because not to mention the container containing the corpse of the moon prayer person, even the seven ghosts themselves had to be assisted by the abyssal ghosts, they didn't have any special abilities, but they were as indispensable as the worker ants in the ant colony. When the elevator doors were fully closed, several white panels on the surrounding walls emitted a bright glow, filling the space five or six meters long.

There is no sense of weightlessness in the whole falling process, the elevator seems to be completely stuck in place and does not move, but the signal molecule keenly captures a trace of abnormality in the space while discovering that the elevator is descending, that is, there is a faint ripple in the space shelf that is almost imperceptible, even the spatial jump of a ping-pong ball is much stronger than this fluctuation, which is the influence of the weak bending of the gravitational field on the space-time structure. The familiar fluctuation made Xinglan stunned for a moment, there was no need to judge too much, it must be the faint ripple generated by the operation of some artificial gravity system, which also canceled out the weightlessness of the elevator.

Instead of numbers, a cross-sectional view of the entire deep-sea fortress is displayed on the elevator door, with hundreds of glittering dots and intricate paths. This shape is not complicated, and Xinglan quickly realized that this is the circuit diagram of the operation of this elevator...... Of course, it seems a bit inappropriate to say this at this time, this elevator is not just running longitudinally, but extends in all directions inside the fortress like a subway track, and when the green dot representing the current elevator moves along the track all the way to the bottom of the entire fortress, all the people of Tianyuan know that their final destination has been reached.

"Central Brain No. 2...... The last time I was here was a long time ago. ”

With a low roar, the metal door with a thickness of nearly half a meter slowly opened in front of them, and an indescribable aura came to their faces, almost at the moment when the outside light shone in, the entire elevator was filled with flickering spots, except for Qingkong who immediately adjusted his visual reception rate, the other Tianyuan people couldn't help but squint their eyes to temporarily block the strong light.

"Hiss......"

A few Abyss Ghosts, who were obviously coming here for the first time, couldn't help but gasp and looked at the huge crystal cylinder in front of them with shocked expressions...... The protruding part of the entire abyssal fortress takes the shape of a hemisphere, and the elevator door opens in a corner of this hemisphere, and in front of it is a crystal cylinder that occupies most of the space, and the top and bottom are completely joined together. The crystal cylinder was not transparent, but was covered with countless intricate sections on the outside and inside, and the blinding white light refracted back and forth between these sections, and when they shone into the outside world, only countless brilliant spots of light could be seen slowly turning.

The whole cylinder seemed to be glittering, but from the outside, the internal scene was no longer visible at all, but every Tianyuan person knew after seeing the empty halls in other places that the existence called the central brain was inside this crystal cylinder.

Most of the people of the Abyss are not allowed to come here for anything, but in fact they are not going to be withheld from any information, they just don't need to come. No one of the Abysses would hurt any of the central brains, not even the idealists who went out on their own and called white scientists, and besides, even if they wanted to...... I don't have the ability to hurt the central brain.

Xinglan was also watching this scene, and the signal passed through the abyss people who had stopped, until they approached the surface of the crystal cylinder. She didn't have the awe of those Abyssal people, in fact, she was very curious about the way the central brain existed, so she didn't hesitate to try to touch the crystal cylinder. This is not a special material at all, it is just an inorganic crystal cluster that is very common on the Tianyuan Star, but the purity of these crystals has been refined to a very high level. At first, when she saw those complex light patterns, Xinglan thought that they were similar to the optical path crystal computers she had seen before, but she soon discovered that these profiles were not logical arrays used for calculations, and that they had only one meaning for existence, that is, to weaken, constantly weaken the intensity of light and radiation.

That's right, it's radiation...... As Xinglan tried to penetrate deeper into the crystal cylinder, she found that the closer she got inside, the frequency and intensity of the light began to increase wildly, and at the same time, there was an increasing amount of radiation, most of the energy in these rays was absorbed by the crystal cylinder itself, and its material began to become special, the melting point became higher and higher, and the internal temperature even reached thousands of degrees Celsius without melting.

She had a feeling that this magical-looking crystal cylinder might not be to prevent those Abyssal people from harming the central brain, on the contrary, this isolation measure was to prevent them from being harmed by the powerful radiation and light inside the crystal cylinder, although she didn't know where such a powerful energy came from, it was probably the central brain.

Once the signalns had passed through this layer, the signalns felt the gravitational pull from within the distortion of space, and these devices seemed to form a protective force field, confined the effects of a strong gravitational force inside the field, and after passing through them, the gravitational strength began to increase exponentially. The glow and radiation inside the force field also began to get stronger and stronger.

The crystal cylinder was hollow, it was just a circular crystal wall, and when the signal had completely penetrated the outermost crystal, Xinglan finally made this shocking discovery.

"That's what it is...... Central Brain No. 2. ”

What exactly is the central brain? It is not a king, not a leader, not the creator of an entire species. It's not silicon-based, it's not carbon-based, it's not even other elemental organisms.

Every Tianyuan person...... Even the most ordinary abyssal ghost has its own individual consciousness and its own name, but only the central brain will not have a name, it will not have any desire for power, it will not have any self-interested thoughts, it is the species of Tianyuan people themselves.

Wisps of white spore spread across the inner surface of the crystal cylinder, and although they looked similar, Xinglan quickly confirmed that they were not source spores, and that they had lost their invisibility in the microcosm, and thus their status as the origin of thousands of beings. These degraded spore filaments are densely distributed throughout the inner surface of the Crystal Cylinder, and where the top Crystal Cylinder connects to the abyssal fortress, elongated ionic material flows from the two junctions. These slender substances extend downward in a double helix at temperatures of several thousand degrees, gushing out of the junctions above, and finally disappear without a trace.

…… At least from the point of view of visible light, there is nothing there.

However, Xinglan did not only observe from the perspective of visible light, so she saw the thing in the center of the crystal cylinder, the thing that silently swallowed up the flow of ionic matter falling above, and filled the entire space with all the sources of gamma rays and intense radiation.

Is this the central brain? That's right, this is the central brain.

In the center of the crystal cylinder, a miniature neutron star is rotating at tens of thousands of revolutions per second, emitting intense particle radiation.

You can kill a Visioner, or you can easily kill a Star Chaser, or even any other Abyssal Man, but at least in this civilization, no one can kill the Central Brain. Guns can't do it, nuclear bombs can't do it, even starships can't do it, it's an ultra-dense mass made of neutron star matter in a degenerate state, and it's far harder than anything else the Abyss civilization can make.

They are computers that can operate at ultra-high speeds, capable of providing remote data processing support for each Abyssal person in their subconscious, they are a group consciousness without any selfish desires, accurately distributing the work of each subordinate Abyssal person, and at the same time, they are also the last strongest guarantee for the Abyssal people, because neither the crystal creatures nor the Abyssal people themselves can destroy them.

The existence of this creature is really too weird, even more weird than the super self-healing ability of the Abyss people themselves. The central brain is not unconscious, they just have no self-awareness, that is, they do not have the concept of their own individual, which means that they can communicate, and the means they use to communicate also include electromagnetic wave language, so when Xinglan tries to connect her thinking network with the communication interface of this miniature neutron star, as if she had an encounter with the wind, she successfully intercepted a part of the other party's thoughts before the central brain perceives the invasion.

Then, she realizes that she has made a big mistake all along......

(Thanks to the 588 starting coins of "Night Moon Black Wing" for reward~)