In the center of the Endless Sea, a massive and deep whirlpool continually rotates, appearing bottomless, like a dark Exotic Beast capable of devouring everything.

Ning Qi and the phantom of the Mountain and Sea Realm Will appeared here, both gazing down at the whirlpool below, with eerie sounds intermittently reaching their ears.

Sometimes it was a screech, sometimes a dull sound, sometimes painful, sometimes mad...

Curiously, Ning Qi asked, "Realm Venerable, what exactly exists within this whirlpool?"

From the legacy left by the Sea Ancestor, he had read information about the whirlpool, but the description was not detailed and was rather brief.

Therefore, Ning Qi didn’t know what this whirlpool was, where it led to, or why it appeared beneath the Moon Sea Immortal Sect.

He always felt that the Sea Ancestor chose to establish a sect here, seemingly to suppress this whirlpool.

"Cough!"

The Mountain and Sea Realm Will coughed before responding, "This place gathers the yin energy of the entire Mountain and Sea Realm, and is also the place where the Sea Ancestor attained Enlightenment. Once you go inside, you’ll understand. Let’s go."

With that, he stepped forward and descended toward the whirlpool.

Ning Qi naturally followed him.

Swoosh!

The wind roared past their ears, carrying both the tranquility of ocean currents and eerie screeches.

As the two of them entered the whirlpool, the world before them suddenly darkened, as if they had stepped into another world.

Ning Qi silently released his Perception, but to his surprise, he couldn’t sense anything.

This was rather terrifying!

For him now, be it in the Mountain and Sea Realm or the Vast Realm, there were almost no things that could block his Perception.

Yet before him appeared such a bizarre situation, making him silently raise his vigilance in his heart. It seems there are still many unknowns in the two realms.

Ning Qi gazed forward, where the phantom Mountain and Sea Realm Will continued to lead the way.

Suddenly it twisted left and right, at times diving into the seawater, and Ning Qi kept up.

At times it emerged from the seawater, returning to the tunnel of the whirlpool.

As the two of them gradually descended, Ning Qi finally sensed something.

Suddenly, Ning Qi reached out to look at his own skin, each hair standing on end. Then, tiny granular bumps quickly spread, covering his entire body.

"Crack!"

Ning Qi’s teeth chattered, feeling a piercing chill penetrating his body. It seemed as though his whole body was drafty.

At that moment, he had the sensation that his body was tossed into a strange place, with bones as bones, flesh as flesh, head as the head, eyes as eyes, ears as ears, and so on.

Each organ felt frozen and disconnected, as if each was independently isolated.

This bizarre sensation made Ning Qi slightly startled.

It reminded him of the feeling of his clone entering the Sea of Realms, and the current sensation could completely compare to that feeling.

But this is strange, isn’t this within the Mountain and Sea Realm?

He thought for a moment, then instantly shifted the power within him to the power of the Sea of Realms.

To Ning Qi’s surprise, the eerie sensation on his body vanished instantly.

He vaguely sensed that this place probably couldn’t escape being related to the Sea of Realms.

The Mountain and Sea Realm Will ahead continued to advance resolutely, and Ning Qi suppressed the rising doubts in his heart, knowing the answer would soon be revealed.

The two continued forward for an unknown amount of time until Ning Qi’s eyes finally brightened.

A faint bluish light appeared ahead.

As they approached, the faint light rapidly expanded, and the two entered it.

Glug!

It sounded like jumping into water, but they appeared in a space devoid of seawater.

Ning Qi looked around.

Above, rippling lights cast a faint glow, illuminating the space below.

Occasionally, powerful sea creatures swam by, casting huge shadows.

This space resembled an aquarium, but it was actually a space suppressed under the ocean.

Ning Qi glanced around; apart from the brightness visible above, the lower he looked, the dimmer the light became.

This was not merely about the brightness; Ning Qi perceived that there was eerie energy shifting the light and dark from the rules layer.

The further down, the darker.

Ning Qi looked down, occasionally seeing pairs of fist-sized faint lights embedded in the sea walls appearing here and there.

"What is this place?"

The Mountain and Sea Realm Will answered, "This is where the Sea Ancestor drew power from the Sea of Realms, where she imprisoned many Fierce Beasts from the Sea of Realms to study their talents."

Ning Qi was speechless.

This is considered the Sea Ancestor’s laboratory? It’s really well-hidden.

But after a moment of thought, Ning Qi understood.

Within the Mountain and Sea Realm, if the Sea Ancestor wanted to cultivate Forbidden Techniques to defeat the Mountain Ancestor, she definitely couldn’t cultivate openly.

And under the Endless Sea provided her with a suitable space.

The two continued descending.

Following the Mountain and Sea Realm Will downward, Ning Qi gradually discerned what was below.

This place, rather than being where the Sea Ancestor cultivated, was more like an eighteen-layered cage.

From top to bottom, it expanded in a conical shape, with more space the deeper it went.

Within the surrounding sea walls, individual water prison spaces were sectioned off, each imprisoning a Fierce Beast from the Sea of Realms.

Upon seeing Ning Qi’s arrival, their eyes all exuded fiercely greedy and aggressive light, in red, green, yellow, purple, with saliva dripping from their mouths, and they let out alternating roars as if starved for who knows how long.

Ning Qi finally understood where the eerie sounds in the whirlpool originated; they were likely from these creatures.

Ning Qi slightly sensed their power.

From top to bottom, their levels seemed to increase accordingly.