Unlike the previous nuclear fusion power plant, this brand new matter combustion furnace not only has no safety hazards, but it's also not picky about fuel. Even if Yan Fei randomly shovels a pile of dirt at his feet and sends it into the furnace, the pile of dirt quickly participates in elemental decay reaction, transforming its mass into an enormous amount of energy.

Yan Fei has always wanted to supplement the energy for Dreamland Cave World, but the energy provided by the previous nuclear fusion power plant could not integrate into the space crystal wall of Dreamland Cave World. He thought it was because nuclear fusion energy was too low-grade, but now he uses the ultimate method to obtain energy in the universe, and the obtained energy should be advanced, capable of supplementing energy for Dreamland Cave World. However, when the matter combustion furnace officially started to generate electricity, Yan Fei found that its energy still could not supplement even a bit of energy for Dreamland Cave World, which made him very disappointed.

As long as Yan Fei does not recklessly use energy, the total energy of Dreamland Cave World will not decrease any further, but it will not increase either. The energy obtained daily from the mysterious array of the space crystal wall can barely maintain the operation of Dreamland Cave World, with no excess energy to be stored. Dreamland Cave World now has only 9% energy reserve of its peak period, but opening a brand new temporary space channel would consume 1% of the peak period's energy. With such a low energy reserve, Yan Fei cannot continue to open space channels, which amounts to losing one of the most amazing capabilities of Dreamland Cave World.

Besides, there are many places where Dreamland Cave World needs to use energy. Although Dreamland Cave World is attached to the space crystal wall of the Big Universe and is under the protection of the Big Universe, the void outside the Big Universe is not safe, not only frequently invaded by space storms but also potentially by extremely dangerous enemies.

Once these enemies find the exact location of the space crystal wall of Dreamland Cave World, they will definitely attack Dreamland Cave World. Dreamland Cave World must consume energy to resist others' attacks. With the current energy reserve of Dreamland Cave World, it is not enough to resist the attacks of strong enemies. Once the space crystal wall of Dreamland Cave World is breached by enemies, Yan Fei will lose control over Dreamland Cave World, thus losing God's power. Once enemies enter Dreamland Cave World, all the Earth humans residing in Dreamland Cave World could be killed by the enemies.

Yan Fei previously experienced the collapse of a small space. He had entered a small space through the light portal at the underwater plaza in the Bermuda Triangle. There, he witnessed the spectacular scene of a small space collapsing because that small space was originally energy deficient. Once its control center was destroyed by the Super Titan incarnated by Sun Tie, the small space began to collapse rapidly.

Yan Fei was also in that small space back then. He personally witnessed the terrifying scene of small space collapse. After the collapse of the small space, everything within it completely disappeared. If Dreamland Cave World cannot replenish its energy in time, it will eventually run out of energy one day. Yan Fei can fully imagine the terrifying scene when his Dreamland Cave World collapses. By that time, aside from him, probably no one can escape from here. To protect Dreamland Cave World, it must be recharged.

Yan Fei has realized one problem: the energy stored in the space crystal wall of Dreamland Cave World is very important, but there is only one method to obtain such energy, which is through the mysterious formation carved by cultivation civilization on the space crystal wall, absorbing from the Big Universe around Dreamland Cave World. Other than this, no other method can recharge it.

Although Dreamland Cave World has always been absorbing energy through the mysterious formation, it has not been activated, so there was no energy consumption in eighty thousand years. However, after Yan Fei gained control of Dreamland Cave World, officially started Dreamland Cave World, and especially after Yan Fei used God's power to greatly transform Dreamland Cave World and created several space channels to the outside, the energy in the space crystal wall started to decrease gradually.

When Yan Fei was plotted against, allowing the space channel of Ye Su to find his Dreamland Cave World body, the energy in the space crystal wall began to plummet, quickly dropping from the previous peak state to the later 9%. If the energy reserve of Dreamland Cave World is to be restored from 9% to the peak period of 100%, the simplest calculation would need a long time of 71,000 years, provided that Dreamland Cave World does not use the energy absorbed by the space crystal wall during these years, but this is obviously impossible.

Although Yan Fei failed several times, he is still full of confidence. He firmly believes that if there is still someone on Earth who can replenish energy for Dreamland Cave World, that person must be Yang Qi. Even if Yang Qi can't do it now, he definitely can in the future.

After receiving Yang Qi's request last time, to study cultivation civilization, Yan Fei took action, either through computer invasion or in equivalent exchange methods, began collecting various records and canons of cultivation civilization left behind by the Mythical Era on Earth, and handed over everything collected to Yang Qi. Yan Fei also handed over the Spiritual Power Codex he once practiced to Yang Qi, and he also copied the mysterious formation on the space crystal wall and gave it to Yang Qi for research.

Compared to the technological civilization he grew up with, Yang Qi knows nothing about cultivation civilization. He doesn't even know how to study this mysterious civilization that uses dark energy in the universe, not to mention the cultivation civilization he obtained has incomplete canonical texts, with very significant knowledge gaps.

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