"Take this chance to kill it."

Xiao Mu said without hesitation.

This opportunity was too rare. If it weren't for the shattering of the Space Gate and the spatial cutting that had severely injured the Demon, with their combined strength, they absolutely wouldn't be able to kill a complete Demon.

"Let's do it together!"

Zhao Yan immediately proposed upon hearing this.

Xiao Mu nodded.

The three of them looked at each other and simultaneously launched their strongest attacks.

Zzzt!

Zzt!

Crack!

Zhao Yan conjured a Lightning Blade, Wang Tong utilized invisible sword energy, and Xiao Mu unleashed a Thunder Symbol.

Three types of power roared, instantly converging together. Following a nod from Xiao Mu, the three of them simultaneously unleashed their full power onto the Demon.

Zzt!

Boom!

Cra-cra-crack!

Three types of power, including the Ghost Servant's Soul blade, hit the Demon simultaneously.

However, what they saw next left them dumbfounded.

Despite their maximum effort and the combined attack of three types of power, the Demon was unharmed.

"How can this be?"

Wang Tong's mouth gaped open, revealing a look of despair and unwillingness.

Xiao Mu's expression also darkened. This Demon was too strong. Even though it has been severely injured and unconscious, it was not within their power to kill it.

Their attacks, when they hit the Demon, were instantly blocked by its red skin, causing no damage at all.

"The gap in strength is too big."

Zhao Yan shook her head, her face filled with helplessness.

The gap in strength was enormous. Even if the opponent were lying still, permitting them to attack, it was not something they could kill easily.

"Mu, can you try the attack method you used just now again?"

"Let me give it another shot."

Upon hearing this, Xiao Mu knew what Zhao Yan meant. Just now, he had used a Thunder Symbol, successfully harnessing the Thunder Power from the sky, boosting the power of his Thunder Symbol by tenfold instantly.

Therefore, his Thunder Symbol was able to harm this Demon.

Given this, if he could replicate this technique and reuse Thunder Power with his Thunder Symbol, he should be able to hurt this Demon.

Finishing his words, Xiao Mu took out another Thunder Symbol, pasted it on the Peach Wood Sword, and pointed up into the sky.

Crack!

Thunder quickly took form, and even the Thunder Eye appeared.

However, to Xiao Mu's surprise, even though the Thunder formed and the Thunder Eye emerged, the accumulating Thunder in the sky didn't show any signs of being influenced. It didn't integrate with his Thunder Symbol to enhance its power like it did before when battling the Demon.

"How can this be?"

This outcome left Xiao Mu stunned.

"It turns out... we can't borrow Thunder Power!"

Zhao Yan expressed disbelief, "Mu, how did you do it before?"

"Boss Mu, are you saying your Thunder Symbol failed too?"

Wang Tong asked in surprise.

Xiao Mu shook his head: "It's not that it failed; it's that the Thunder Power can't be borrowed."

"How did you borrow it before?"

Wang Tong asked.

"Before..."

Xiao Mu paused at the question. How he borrowed it before, he wasn't exactly sure.

After glancing at the mature demon, he was struck with a sudden realization.

Could it be?

"Perhaps this has something to do with the mature demon?"

"This mature demon does not belong to this world. It was forcibly entered into this world and is consequently being repelled by it. As a result, this world lowers the thunder, aiming to destroy it."

"So, I used the Thunder Symbol, successfully borrowed the forming thunder, and attacked this mature demon."

"But now, this mature demon is unconscious. Maybe for this reason, the rules of this world cannot sense its presence, and so it no longer lowers the thunder to kill it, hence, I can no longer borrow the thunder."

"This..."

Wang Tong was stunned, but soon followed with a bitter smile, "So, does this mean that this mature demon cannot be killed?"

Xiao Mu shook his head slightly, looking at Wang Tong and then at Zhao Yan, his face full of helplessness.

Unable to borrow the thunder, indeed as Wang Tong said, this mature demon, for the time being, is not something they can kill.

"Mu, what should we do?"

After glancing again at the mature demon, Zhao Yan seemed a little worried.

Their attacks are incapable of inflicting enough damage on the mature demon to kill it.

However, this mature demon, albeit severely injured and unconscious, might soon be able to regain consciousness.

"Do you think it will wake up?"

No sooner had Zhao Yan spoken, than Wang Tong seemed deeply worried.

"I think we'd better leave as soon as possible."

Xiao Mu suggested.

The mature demon could regain consciousness at any moment, and once it does, their chances of surviving if they stay here are absolutely nil.

"Are we just going to let it go? This is a mature demon."

Wang Tong seemed reluctant.

They finally managed to severely injure a powerful mature demon. The idea of letting it go was unbearable to anyone.

Who knows if they will ever get such an opportunity again.

"There's nothing we can do. This mature demon could wake up at any moment. We have to seize the opportunity to leave now, or we will all die here."

Xiao Mu looked grave.

"I just can't stand it!"

Wang Tong spoke resentfully, but did not counter Xiao Mu's words.

He knew that Xiao Mu was right. If they didn't leave now, they might not get another chance.

"Wang Tong is right, leaving like this is indeed unpalatable."

Zhao Yan suddenly said, then looked at the mature demon thoughtfully.

"So what else can we do?"

Xiao Mu retorted, unable to pitch what Zhao Yan was thinking.

"We should take something before we go."

Looking at Xiao Mu, Zhao Yan voiced her thought.

"Pfft!"

Xiao Mu burst into laughter, almost lost control of his emotions. He stared at Zhao Yan and said helplessly, "You can't be..."

He easily guessed his girlfriend's idea. She clearly intended to profit from this mature demon.

Zhao Yan had indeed changed a lot over time. However, in this mutated world, such a change was obviously a good thing.

Zhao Yan nodded matter-of-factly, pointed at the mature demon and said, "This is a rare organism. Maybe, apart from us, no original species in this world have ever seen it."

"Thus, such an organism inherently has great research value. Whether it's the skin, Google, flesh and blood, even a single hair, one drop of sweat— all possess immense value. If taken out of here, it can definitely fetch a good price."

Following the World Mutation, science has not stopped. Although some high-tech weapons have been temporarily suspended, research into the post-mutation world has in fact surged in popularity.

Various research institutes have sprung up, not just conducting research on mutated beings, but also on mutated animals, mutant plants, and mutant items, etc.

The reason for such research is to understand the cause of mutation and subsequently control it. By wielding science, all kinds of mutations can be manipulated into controllable forms.

Reportedly, the results of such research in major laboratories have been very promising. Some top-notch laboratories have even managed to cultivate Mutated Beings using their own power.

As such, as Zhao Yan said, a powerful existence like the mature demon, even if only a drop of blood is taken out, can definitely fetch a good price.

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