Four days later.

Jade City, No. 3101.

"Zhou, Ambassador Feng Che has already sent the sixth request. You should go to the Heavenly Kingdom with him to attend the Universal Exhibition. Today is the first day of the exhibition. In the first two days, all major forces will place the most orders. Being late will significantly reduce effectiveness..."

Red Kestrel kept chattering in his ear.

"Stop it, stop it. Catching something here is important."

Zhou Yi was fully immersed in a new busy task.

He threw out a backup plan: "You and Qian Su go with Feng Che first. If I ultimately can't attend this exhibition, you'll be responsible for everything on-site. You handle specific agreements, and Qian Su will take care of promotions and sales."

The drone asked, "Will the company's new products be exhibited?"

"Primarily display the tested products first. If I still haven't arrived in two days, you can release the new products."

"Understood."

Red Kestrel left.

According to the original plan, Zhou Yi should already be at the exhibition site, and he had prepared a lot for it.

But just before leaving yesterday, the artificial leg ran back.

It found a strange arm.

Zhou Yi couldn't help but suspect whether the artificial leg had some ability to gauge the situation. It noticed that his right arm was incompatible with his body and specifically went outside to find an arm for him...

Just one problem.

This arm was too large, about two meters long, and entirely made of Light Core structure, with smooth and delicate crystal surfaces.

All six fingers were of the same length.

Zhou Yi used [Panoramic Reading] to analyze it.

[This material contains energy from a Light Core Body of LV4 level and has a relatively stable structure.]

[This material has a special energy configuration, suspected to be some type of functional tool, but the principle is unclear.]

This was some kind of Light Core level device made by the Cave People.

Its specific use could only be known through experimentation.

Hei Fu suggested, "This thing has a high energy level, with unknown mechanics. Using it with your current non-Light Core level body will pose unpredictable risks."

"The destructive power of the Light Core level is already very strong. A little carelessness could cause irreversible damage."

"Da Zhou, don't forget, that's exactly why your right hand can't be restored."

Regarding the Light Core Body, Reverse Flow became very cautious.

Zhou Yi had a different perspective: "Since it's a functional tool, it shouldn't be prone to causing strong explosive damage like a combat tool. I'll try it carefully, and if it doesn't work, I'll give up."

"I'm prepared for irreversible damage. Worst case, I'll replace some of my prosthetics again."

He harbored a bit of hope.

This thing was a Light Core structure. If it turned out to be a mechanical hand for creating energy blocks, he would hit the jackpot!

Yi began to experiment.

He chose the location below the Moon Landing Area and took out the Light Core Arm.

No radiation.

Very stable.

Zhou Yi held the Light Core Arm with both hands. It was like a thick, long spear. Beneath the diamond-shaped crystal surface, some structures resembling blood vessels or nerves could be seen.

These thin lines spread throughout, making Zhou Yi recall a specimen he had seen in a medical museum.

The specimen was made from a donation. The creators injected a plastination agent into the blood vessels, solidifying them, then washed away the tissues and muscles, and dyed the arterial vessels red and the venous vessels blue. It turned into a root-tangled vascular human made of 30 billion blood vessels.

The structure inside the Light Core Arm was similar.

But its lines were semi-transparent. Only by carefully observing it up close could the intricate and complex web-like pathways inside be seen.

To be safe, Zhou Yi first let Hei Fu try using this device.

Hei Fu activated the Light Core mode, manipulating it back and forth, but was unable to activate it.

"Chairman, this thing should have a specific way to operate, otherwise it's just a rod. If you can't use it, then give it to me as a weapon... I can use it to smash enemies!"

Zhou Yi: "..."

He then let Cat God give it a try.

The Concept Life turned into numerous electric arcs that wrapped around the Light Core Arm, carrying it back and forth like lightning fists.

It also couldn't work it out.

"Chairman, this arm has no electrical signals. There's no consciousness inside; I can't actually start it."

Zhou Yi tried himself.

There was no switch on it, nor any way to synchronize consciousness.

He could only treat the arm as a double-handed weapon, without any other recourse.

Ultimately he turned to the Dong clan.

One must ask the one who tied the knot to untie it; after all, Cave People were their ancestors.

"Mr. Zhou, let me try."

The Shell Sanctuary touched the Light Core Arm, smoothly merging into it.

Zhou Yi saw that the sanctuary connected seamlessly with the semi-transparent Light Core blood vessels.

The transparent fine lines covering the arm suddenly began to contract, forming stable main trunks, and the entire arm came alive.

It slowly lifted, rotated, and the fingers stretched.

The Light Core Arm had no bone structure, so the range and angles of movement were significant. Despite its hard crystal structure, it made various incredible bends and twists like a soft body.

"Mr. Zhou, this is indeed a tool made by the Cave People!"

"It's called 'Corridor Palace,' a grand device used to connect two different spaces."

Dong explained, "The linear vessel structure inside is actually a corridor created from Cave People remains. These corridors allow Cave People to enter various areas and contain instructions and records for operating this device."

"Because this device was designed and manufactured according to Cave People, only Cave People can connect, read, and use it. Thus, only we Cave People can operate it."

Zhou Yi had indeed had this suspicion.

Previously, he vaguely theorized this.

The Cave People used their remains as a crucial material, reminiscent of their civilization's development of [Consciousness Nerve].

He asked, "Can the Corridor Palace connect any two spaces, including high-dimensional spaces?"

"Yes."

Dong replied, "However, its strength can only enter up to five-dimensional spaces. Higher than that, it can't pass through. Entering high-dimensional spaces will endure significant pressure, so it can only last for a short time, and the energy consumption is very high."

"The Corridor Palace was created primarily to connect similar three-dimensional spaces. Entering other three-dimensional spaces would result in Cave People not returning, so this device was built to protect their kind. It allows Cave People to explore and interact with the external world without direct exposure to danger."

"One significant application is that it can enter other worlds to capture local materials, collecting them through the Corridor Palace and bringing them back."

"This device hasn't been widely used yet. According to the corridor records, this is the first mature Corridor Palace. The 130 million Cave People operating it died naturally inside due to a lack of new operators."

"They are somewhat similar to us, but we don't know what happened outside."

Zhou Yi listened carefully.

It seemed the Cave People encountered some sudden destruction, leading to their entire species being wiped out in a short period.

Low birth rates and high death rates were just indirect reasons.

Dong suggested, "Mr. Zhou, do you want to try the Corridor Palace? It's a remarkable device."

Zhou Yi said helplessly, "My size won't fit in. This thing is too small for me."

"You can use it as a tool."

Dong said, "It can expand and shrink. Adjusting inside can alter the Cloud Elixir structure. Based on your requirements, it can become part of your external connection, like a bone."

What?

It can shrink.

Zhou Yi tried to synchronize consciousness with Dong, and the Light Core Arm visibly shrunk, finally becoming about the length of a normal human arm.

However, after shrinking, the Light Core Arm became somewhat murky, with a fog-like structure inside.

"Mr. Zhou, that's our folded internal corridors, but it doesn't affect operation."

Dong explained.

Zhou Yi tried to remove his "Hand of Dexterity" right arm prosthesis.

Actually, this was a temporary replacement; previously, his right arm prosthesis was severely damaged on the Moon and was still being repaired in the hospital.

He installed the Light Core structure Corridor Palace on the right arm stump, and it instantly connected seamlessly with his body.

Zhou Yi flexed his new Light Core Right Arm.

It was far more flexible than expected.

He could barely tell the difference between his left and right hand, and its sensitivity and perception was identical to his original arm.

But there were differences.

The Light Core Right Arm could clearly sense energy and consciousness flowing through it, transmitted back and forth through the dense corridors to the hand and stump.

Zhou Yi was amazed, "How is this possible?"

"Mr. Zhou, the Corridor Palace is fantastic."

Dong proudly replied, "It has another feature, which is connecting other Cave People devices. The connection function is incredibly outstanding. Plus, I can converse with you through consciousness, making it like a part of your body."

"Try connecting other spaces."

Zhou Yi felt a sense of wonder, only the six equally long fingers were a bit uncomfortable.

At his request, Dong adjusted them.

The extra fingers retracted.

The fingers transformed into irregular human shapes of varying lengths.

Zhou Yi comfortably stretched his fingers and clenched his fist.

The strength of the right arm was robust, which he could clearly sense.

A single punch could potentially kill a Skywalker.

Nevertheless, the Corridor Palace arm's major feature was its cross-space connection, allowing exploration of the other side's situation through spatial channels. It felt a bit like a lottery box game.

But if it was going to be cross-space clawing a toy.

Surely, I want something stronger.

Zhou Yi rode Hei Fu to the artificial Light Amber Mine area. The black pipes here continuously spewed large amounts of white sticky minerals.

Numerous drones and mechanical engineering vehicles guarded and maintained this area.

He reached into the cavity.

The Light Core Arm penetrated the spatial channel, entering the other side of the black sticky channel into four-dimensional space.

Zhou Yi groped around, feeling his fingers go numb and experiencing a strong burning sensation.

The Light Core Arm also struggled to withstand the pressure of high-dimensional space.

He grabbed randomly, pulling whatever he held back.

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