But in this regard, he had already anticipated it.

Because each breakthrough to a higher realm requires consuming a massive amount of Origin Energy.

So during this time, he harvested a large quantity of Immortal Elixirs and Immortal Fruits.

Such as Peaches of Immortality, Huangzhong Immortal Fruit, Reincarnation Fruit, Five Elements Immortal Fruits, etc.

These Immortal Elixirs and Immortal Fruits entered his body as if they were free of charge.

Then instantly transformed into vast indestructible matter, which merged into his Cave Heaven World.

This made Zhou Sui feel extremely comfortable.

It was as if his body was soaking in a hot spring, warm all over.

"Comfortable."

Zhou Sui took a deep breath, feeling very pleased.

After obtaining such vast indestructible material, the Cave Heaven World within him underwent earth-shattering changes.

The original Cave Heaven World expanded wildly, expanding continuously.

Tens of millions of light years, thirty million light years, fifty million light years, one hundred million light years, three hundred million light years...

In the end, it expanded to a full billion light years.

Compared to before, the Cave Heaven World expanded multiple times, vast and boundless.

The inside of the Cave Heaven World was immensely empty, capable of accommodating countless celestial bodies and innumerable living beings.

Like a galaxy.

"So enormous."

Zhou Sui's heart was filled with awe, he never imagined that after ascending to the Ancient King Realm, the Cave Heaven World within him would expand to such an extent, like a small universe.

In some sense, it was already similar to a primordial universe.

He sensed that his Cave Heaven World contained endless mysteries, resonating with the entire universe.

A vigorous power filled every cell within his body.

It seemed that with just a thought, he could unleash energy capable of destroying the surroundings of millions of light years.

Now he was practically an apocalyptic disaster.

Every move brimmed with endless might.

"The Reincarnation Law has also merged into the Cave Heaven World."

For Zhou Sui, he felt that the greatest change in the Cave Heaven World wasn't just the expansion of its internal area, but more importantly, the integration of the Reincarnation Law.

The originally chaotic and disorderly laws became balanced after incorporating the Reincarnation Law.

The laws within no longer conflicted with one another.

The laws of the entire Cave Heaven World were completely stabilized, even forming a cycle.

"Now, even if the Cave Heaven World is destroyed, it can be reborn."

Zhou Sui clenched his fist.

He realized that the Ancient King Cave Heaven within him was incredibly powerful, possessing the characteristics of immortality or rebirth after being melded with the Reincarnation Law.

If the original Cave Heaven World were destroyed by enemies, restoring it was incredibly difficult.

But integrating the Reincarnation Law made all the difference.

The whole world became like memory metal, capable of swiftly restoring itself to its original state even if damaged, given enough time.

Even if completely destroyed, it could regenerate rapidly as long as a trace remained.

This was just like the current universe.

Despite multiple reboots, it could restore itself each time.

Of course, it's not as powerful as this universe, but compared to ordinary Cave Heaven Worlds, an Ancient King Cave Heaven is extraordinarily powerful, profound, and filled with endless reincarnation mysteries.

"Upon reaching the Ancient King Realm, there are also risks of Dao dissolution."

"But an Ancient King can control their Soul, eradicating many calamities."

"Allowing one to always remain in their peak state."

"Thus, an Ancient King's life span is infinite, living as long as heaven and earth."

"As long as the universe isn't destroyed, an Ancient King is an indestructible existence."

Zhou Sui sensed that only upon ascending to the Ancient King Realm do Immortals truly possess eternal life, escaping numerous calamities, even able to survive the Big Bang of the universe.

This is the power of comprehending the Reincarnation Law.

"Now I truly stand at the pinnacle of the Immortal World."

Zhou Sui took a deep breath, feeling very excited.

Though further ahead are the levels of Primordial Immortal King and Taikoo Immortal King, in essence, they all belong to the same tier, the differences in Cultivation only being due to the accumulation of Origin Energy within.

Some Ancient Kings traversed numerous universe cycles, continuously enhancing their combat power.

But among each other, there hasn't been a substantial qualitative change.

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