At this moment, Gu Yuan was no longer indifferent. He began to infuse his eyes with mana, searching for any unusual circumstances nearby.

Simultaneously, Gu Yuan activated the Five Spirits Mystic Heaven Slay Demon Sword Array within him, unleashing a hint of power and began sensing the surrounding situation.

A faint layer of five-colored spiritual light emerged on his body, and even his eyes emitted five-colored brilliance, adding a touch of mystery to his presence.

Ao Kui did not rashly interrupt and even proactively guarded around Gu Yuan, preventing any potential threats to him.

After roughly half an hour, Gu Yuan seemed to notice something. He suddenly turned and looked in the direction to the left. Without saying a word, he flew straight over.

Seeing this, Ao Kui promptly ordered his men to follow quickly.

After flying approximately dozens of miles, Gu Yuan stopped.

Then, he sent forth a beam of five-colored sword light into the void before him.

The originally empty space began to ripple like the surface of a lake as Gu Yuan's five-colored sword light cut through.

It seemed that Gu Yuan's five-colored sword light was merely a key, a catalyst, activating something in this place.

Seeing this, Ao Kui was also quite pleased.

Soon, the ripples in the space spread out, expanding their influence. Gradually, small void cracks appeared, and in those cracks, five-colored lights faintly overflowed.

Compared to Gu Yuan's Five Elements Sword Light, these five-colored glows were evidently purer, and their essence was obviously of a higher level!

Gu Yuan and Ao Kui exchanged glances and quickly retreated to a safe distance before stopping.

Then, after a short while, the changes ceased.

Revealed before them was a stone door about a dozen meters tall, appearing black-gray, looking cold and heavy, without any unnecessary patterns, seemingly unassuming. Yet, the aura it emitted was particularly profound, resembling a mountain.

With a glance from Ao Kui, one of his armored shrimp soldiers stepped forward without hesitation, attempting to push the door open.

Despite exerting much effort, the stone door didn't move an inch. Even as the shrimp soldier swung a spear forged from millennium cold iron, striking heavily against the door, the stone door emitted a burst of astonishing spiritual light.

The light was five-colored, with a comfortable, perpetually flowing charm.

Immediately afterward, the light hit the shrimp soldier but did not blast it away. However, the shrimp soldier did not meet a favorable fate.

As a Golden Core Demon, though its Pill Grade wasn't high, its demon body naturally possessed divine power. In addition to its cold iron armor offering strong defense, its strength was comparable to a Middle Grade Pill cultivator's.

Normally, even the Golden Core Great Cultivators of Second or Third Pill Grade would find it difficult to kill it in one strike.

Yet now, wherever the five-colored light passed, the armor, weapons, even flesh and bones of the shrimp soldier began turning to dust as if melting snow.

In a mere instant, the entire shrimp soldier vanished without a trace, leaving no foundation behind.

Gu Yuan and Ao Kui exchanged a look of mutual apprehension and shock.

Although the five-colored light was thin, its power was seen clearly by both!

Let alone the shrimp soldier, even if they were to step forward, they would certainly gain nothing.

At most, they could use the magical treasures and various means at their disposal to resist a while longer.

The shock in Gu Yuan's heart was even greater because he noticed a hint of the nature of this five-colored glow, clearly a kind of Great Divine Techniques of the Five Elements!

It was highly likely the infamous Great Five Elements Extinction Divine Light of legend!

This Great Divine Technique is entirely opposite to the Five Colored Divine Light Divine Techniques.

The Five Colored Divine Light Divine Technique is highly powerful, capable of overcoming all barriers, unpredictable and dynamic.

But the Great Five Elements Extinction Divine Light pursues extreme power, and once cultivated to Great Success, it can obliterate all visible and invisible things.

Its power ranks among the top of numerous Great Divine Techniques!

At least, Gu Yuan was quite excited and envious; if he could master this Great Divine Technique, it would greatly enhance his strength!

Although, it's uncertain if there is an appropriate entrance for cultivation within this Cave Mansion...

"Let me give it a try."

Seeing Ao Kui glance over, Gu Yuan understood his intention and did not refuse, as he had previously agreed with Ao Kui, which was appropriate.

Gu Yuan stepped forward, briefly pondered, activated the Power of Sword Dao of the Five Elements, and began to emit five-colored light with the rotation of Five Elements, perpetually flowing, clearly differing from the stone door previously.

Then, he placed his hand on the stone door.

Ao Kui held his breath, quietly watching the scene.

The next moment, Gu Yuan's hand pressed on the stone door without eliciting any reaction from it. However, Gu Yuan faintly perceived the overwhelming and pure Power of the Five Elements within the stone door.

This Power of the Five Elements was immense and weighty, like divine mountains and seas.

Even though Gu Yuan's cultivation was quite profound now, it was clearly inferior to this Power of the Five Elements, as distinct as charcoal versus a furnace.

If Gu Yuan attempted to forcibly break this door, the outcome would likely be no better than the shrimp soldier earlier, and possibly worse!

At least, while the shrimp soldier was obliterated by the five-colored light, if Gu Yuan forcefully broke through this stone door, the contained Power of the Five Elements could counteract, infiltrate Gu Yuan's body, and transform him into a puppet devoid of self-awareness.

This wasn't Gu Yuan joking but truly sensing that within the stone door, the Power of the Five Elements held a hint of inherent consciousness.

However, Gu Yuan also felt that if he chose not to forcibly destroy but rather employed intelligence, akin to solving a puzzle, to break the complex restriction constructed by the Power of the Five Elements on the stone door, perhaps he could open it.

Gu Yuan did not rashly choose his course and instead returned to his original position, sharing his conjecture with Ao Kui and inquiring if Ao Kui had any alternative methods.

However, Ao Kui truly had no other approach.

Thus, Gu Yuan decided to follow his own idea.

He again approached the stone door, placing his hand against it, then closed his eyes, channeling the Power of the Five Elements within him into the stone door.

Soon, a faint five-colored spiritual light emanated from the stone door's surface, and a mysterious and exceedingly complex restriction manifested.

This restriction formed by the Power of the Five Elements was not only extraordinarily intricate and profound but also constantly evolving.