There was no hole on the moon, so no one could go deep unless they were rank true immortals with a complete law.

Lei Xue assumed that the core is where the negative life energy comes from to create the undead;

To make the undead, the living are needed.

That's why there are so many skeletons. Obviously, the undead here 'cultivated' mortal humanoids and dumped them here to create undead humanoids.

But that's not enough.

Negative life energy is also essential. NLE is life energy with a negative value, and with it, corpses turn into the undead.

The process is complicated, and most civilizations won't spend time researching it.

The timing, amount, flow, replacement rate, etc, all must be precise.

The world's laws detest negative values, so in most worlds, one must carefully store NLE to prevent its destruction.

This world is customized for the undead, so it is much more resistant to Negative values, but still, it's best to store it in a safe place.

A good place is the core of the moon.

It's covered with a massive amount of materials, with those below rank 10 having no chance to sneak in and steal from it.

The undead love NLE, and they would steal it given the opportunity.

Lei Xue wanted to cast a dao spell, but he turned his head in a particular direction.

"Headache!" he thought.

Of course, the moon is not empty; strong undead also exist.

In the exact place Lei Xue looked at, a skeleton appeared.

A skeleton with a sword.

Savior could not detect any aura from it, but Lei Xue knew that it had a complete law. In other words, it was a true immortal.

"Fellow... Undead, we..." As Lei Xue tried to resolve it peacefully, the skeleton attacked.

"Darn it!" Lei Xue frowned.

Rachel also sighed. Her control over this world is loose, so she has no idea who this skeleton is.

Lei Xue cast the dao spell 'Call the wind.'

The skeleton's attack speed was countless times faster than the speed of light. Clearly, it disabled the world's speed restriction around itself. Even though it did not altogether remove all speed restrictions, it could move countless times faster than light.

The power difference between rank 10 and 9 is like that between an ant and a giant the size of a planet.

No matter how many rank 9 individuals there are, they can never defeat a rank 10 with the energy left to fight.

Only by draining it of energy with waves and waves of attacks can they have a chance.

For this attack, no rank 9 can even see it.

But Lei Xue could see it, even though the skeleton moved countless times faster than light. And, with his complete law, he had long created a field around himself that wouldn't allow invading forces to turn off the world's laws.

As a result, as soon as the skeleton entered that field, its speed dropped to 'only' the speed of light.

Lei Xue spotted it and pointed 'Call the Wind' toward it.

A terrifying wind, so intense that the whole moon vibrated, hit the skeleton before it could react.

Boom.

The skeleton was shot into the main world below the moon.

Fortunately for the main world, it traveled at the speed of light, so it would take a lot of time to hit it and cause a disaster for the undead there.

The skeleton was barely damaged; it somehow stopped its descent and teleported back.

It was tens of kilometers away, but Lei Xue could see it as if it were right beside him.

"Fellow skeleton, let's talk about this!" He was unwilling to fight, as it would take a lot of energy to kill it.

"Are you sent by Rachel?" a whisper came.

"Yes, Master Rachel sent me," he said with relief.

Now that it knew he was here by the order of this world's master, everything should be fine.

"Then you shall die!" it whispered.

Lei Xue was astonished.

The moon opened, and five more skeletons, all rank 10, appeared.

"Darn it!" Lei Xue was now sure. His enemy was not rank 10, but rank 11.

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The enemy most likely controls these skeletons.

Lei Xue is strong in rank 10, but in the face of a Law Master immortal Realm who has at least 6 complete laws, at best, he could run away.

All six attacked at the same time, all with speeds far beyond light.

They hit Lei Xue's field and injected a terrifying amount of Chaos energy into it.

The field resisted for a moment and then broke.

"How can I die like this?" Lei Xue thought. He would die.

Rachel sighed and took action.

She modified the code and removed the locations of Lei Xue and Savior from the space of this world.

She had the code ready, and this world was her world; its information was all in the database, so she did it nearly instantly.

As a rank 10, Rachel was as fast as the skeletons, if not faster.

All the skeletons reached Lei Xue, swung their swords, and somehow missed.

It was beyond what mortals could imagine.

Lei Xue was there, but the swords missed him, no matter how the skeletons attacked.

"Space manipulation," the whisper came again.

The six skeletons all retreated and merged into one.

A giant undead, with red light in its eyes and luxurious clothes, appeared in their place.

It had a giant sword that shone with dark light. Its value was incredibly negative, and just standing there was damaging the world's laws.

It swung its sword, and a sword lit with extremely negative energy attacked Lei Xue.

"It's troublesome! This strike can break my code!" thought Rachel.

Most worlds below rank 12 are coded based on complete laws, but this world differed.

Its source codes were based on NLE, with the structural codes being with realization energy.

This insulated the worlds from being too damaged by the undead, and even if damage appeared, it would be fixed automatically, as the source code itself was based on NLE.

There are significant downsides to codes of a world being from negative energy.

But, one 'upside' is that the undead can live in such a world.

Rachel's code just now was based on Realization energy, which would be damaged at best and destroyed at worst by such a negative energy attack.

"Negative energy coding is time-consuming, so it's out of the question. Universal coding is too costly. Chaos..." she was thinking calmly as the strike was coming.

The attack was aimed at Lei Xue, so teleportation won't work. It is not just a mortal strike; it will hit Lei Xue no matter where in this world he runs to.

"Headache! Where did this undead come from?" As a rank 10 incarnation, she had no chance.

Therefore, she contacted the rank 12 incarnation responsible for this world and many other undead worlds in this area, asking for help.

The incarnation reacted immediately, dissipating the attack and freezing the undead in space.

It was the operation of a rank 12 universal law.

In Lei Xue and Savior's view, the undead froze suddenly, like a piece of stone.

But the undead was actually fiercely struggling.

It released all of its terrifying negative energy, trying to destroy the restrictions on its body.

However, in the face of a universal law, it was like a mosquito trying to sting a piece of stone.

With the struggle, it was only harming itself and not the bind.

"Leave it, go and explore the inner workings of the undead," said Rachel.

It cost her more than it should have, so her mood was bad.

Every use of universal law costs universal energy. She is indeed rich, but one cannot be wasteful, no matter how rich.

Savior, whom Lei Xue protected, barely noticed anything.

Both Lei Xue's speed and the skeletons' speed were all so fast he didn't even see.

"Rank 10 is too terrifying!" he was afraid.

As a demon who is more than 100,000 years old, it's not easy to make him afraid, but today, he was terrified.

Lei Xue, or the skeletons, could kill him millions of times without him even noticing when.

He was relieved to have Rachel.

Rachel, of course, wouldn't let him die.

Even Rachel cannot resurrect anyone dead.

It is a complicated topic.

She can make a carbon copy of the same person, like retrieving the information from the river of time and rebuilding it, but it wouldn't be the same person.

The soul would be different.

A soul is unique, something that can never be perfectly replicated. At least Rachel can't do it. Rank 14s probably can do it, though.

Therefore, when anyone who completely dies with their soul dispersed gets resurrected, they may look and behave the same, but the soul ID is different and cannot unlock any treasure, space storage, etc, that only operates by detecting the owner's soul ID.

With the most terrifying undead gone, Lei Xue and Savior started moving to the moon's core.

It was an easy task for Lei Xue, who cast a dao spell.

The core of the moon was as he expected. It was like a battery, with vast amounts of NLE stored in it.

But he also didn't understand many details.

Like how much negative light energy is required for an undead, the exact conditions for all kinds of undead, detailed experiments on negative light energy, etc.

Lei Xue was very curious about these, so he planned to stay here long.

For him, this was a once-in-a-lifetime opportunity.

Savior wasn't interested. Undead was not his taste. But Rachel forced him to stay.

As a result, both remained in the moon's core and began their exploration.

...

Zagronan was dazed.

"So, it's an illusion?" he asked Rachel.

"Yeah, it's all fake," Rachel answered.

"It looks more real than reality to me," he said with doubt.

"No, trust me, it's all fake, like the world itself, it's all fake," said Rachel.

Zagronan looked at the massive city in front of him with doubt. It was the biggest city he had ever seen.

Rachel brought Zagronan to an illusion world. Illusion worlds are incredibly complicated and hard to explore.

All illusion worlds in the universe are fake.

They are not real.

Yet, they exist.

But don't really, because they are illusions.

In short, they are paradoxes that can make mortals go crazy. But Zagronan, with Rachel's help, can probably discover something.

Rachel will not let Zagronan reach rank 10 with the law of wisdom. The main body ordered research on the fringes. So, she only allows Zagronan to advance if he gains anything from these worlds.

She did the same with Lee. Before, she went into closed meditation to reach rank 10, but Rachel disrupted her 'closed door' and sent her to a fringe world.

Zagronan continued to look at the city for a while longer.

"It's too detailed! I can't find any clue that it's fake. Rachel, maybe I'm not talented in illusion. How can I learn something even though I can't even realize the illusion?" he asked.

"Illusion is real, but also fake. What does that mean? Let me help you. In short, you can control the illusion if you find a flaw. But if you don't find a flaw, it's real for you and can kill you."

"As for what flaw, it's up to you to discover. The more you do it, the more you understand it. Usually, most who try it will die, but look, you have me to guard. So go and explore," she said.

Zagronan thought for a moment, then smiled. "Let's see how real they are!" He cast a 'fireball' spell.

His fireball was the same size as the city.

It hit, and with a massive explosion, countless people there died.

The city was bigger than even cities in hell, so it's beyond imagination as to how many people lived there.

Zagronan looked carefully and didn't notice a flaw. It was all realistic.

"Those people who died were all fake?" Zagronan asked.

"They were illusions, but they don't know it themselves. For them, everything was real, but for us, they are illusions."

"Illusions are a different reality from us. Some call it the universe's dreams. We are a reality, and they are illusions because we are the most common charge of reality. For them, they are real, and we are an illusion. For us, we are real, and they are an illusion," said Rachel.

"So, is it possible for us to turn into illusions?" asked Zagronan in confusion. He didn't have much knowledge about illusions.

"Yeah, it's possible. The moment we turn into illusions is the moment we die."