Within the core of the Star, the air grew increasingly humid. Moisture and mud deposits formed unique rock textures on the walls of the cavern, and intermittent 'rumbling' noises suggested that an unfathomable Strength was roaring beneath the earth.

That was the sight of hot Magma erupting from the depths, akin to volcanic eruptions.

The Star Core was a massive molten body composed of various metallic substances, with a temperature outrageously high, radiating a blazing crimson hue.

However, for Yu Yuan, such temperature couldn't even bend a single hair on his body.

He sat cross-legged within the Magma, continuing to comprehend the Dao Law contained within the Hongmeng Purple Qi.

Much to his relief, understanding the Dao Law only required him to analyze and grasp the laws governing the operation of Heaven and Earth. It didn't necessitate the absorption of any external substances, unlike the cultivation practice of inhaling the qi of Heaven and Earth, hence it did not trigger the Reverse Action effect.

The Hongmeng Purple Qi truly lived up to its reputation as the foundation for enlightenment.

Beyond its 'ticket' function, it encompassed countless profound essences of the Dao, embodying all phenomena, deeply mysterious, with greatly significant yet subtle meaning, every thought yielding enlightenment.

Not long after, approximately half a day had passed.

"Sigh..."

Yu Yuan exhaled a breath, silently estimating the time, figuring that he would need about two more days before he could return to his own era.

Two days is a brief duration.

In the eyes of the Immortal Gods of the Primordial, whose concept of time is often measured in eons, it's like the digits after several decimal places, hardly noticeable to anyone.

However, many a time, events of significant impact would transpire in the merest moments.

Yu Yuan focused and calmed his mind, delving into the comprehension of the Dao Law, while keeping half his attention on the exterior, always observing outer movements.

He was exceedingly cautious, condensing his Divine Thought to its utmost limit, covering a space of about five million li in diameter centered around the Star, to avoid someone reaching his vicinity undetected.

Under the sweep of his Divine Thought, he "saw" many Demon Gods from the Demon Clan Heavenly Court passing nearby.

Yet, the Ancient Star Domain was vast and boundless, filled with countless cold and desolate Stars.

If one were to search each Star meticulously, even if all the Heavenly Soldiers and Generals of the Heavenly Court were to unite for the task, it would take several eons to search the entire area.

Thus, Yu Yuan hid with confidence.

But the calm did not last.

A nameless palpitation abruptly emerged at the bottom of his heart.

His Divine Thought immediately expanded countless times, stretching into the vast Star Domain billions of li away.

Only then did he notice that the entire starry sky had dimmed.

No! It wasn't that the starry sky had dimmed, but that some Stars had become excessively bright, much like the night sky had gained many new moons.

"Ziwei, Heavenly Mechanism, Heavenly Mansion, Langjiang, Hu Ben, Chang Chen, Langwei, Mingtang, Spirit Platform, Shaowei..."

Yu Yuan gazed at those Stars, and their names naturally surfaced in his mind.

He roughly counted, and the abnormally bright Stars numbered over two hundred, and the count was still rapidly rising. In the blink of an eye, dozens more large Stars had lit up.

Ultimately, the number of these large Stars settled at three hundred sixty-three.

Scattered like pieces on a board, covering the Circulating Heavens!

"Playing such a big game?"

Yu Yuan slightly furrowed his brows, unable to hide a bitter smile.

At this point, if he still didn't realize what was happening, it would be quite unreasonable.

The Celestial Stars Formation!

The ultimate weapon of the arsenal of the Demon Clan Heavenly Court!

It was said the Demon Emperor, Emperor Jun, deduced it from the River Map and Luo Book, enlightening upon the movement of the Primordial Stars, uniting the Strength of three hundred sixty-five large Stars within the Ancient Star Domain, adding Taiyang and Taiyin as the main stars of the Formation. Profound and massive, filled with killing aura, it stands as the number-one Great Formation of the Ancient Heavenly Court.

This Formation utilized the power of the Celestial Stars, combining the might of countless Stars. Its Strength was vast enough to destroy Heaven and Earth.

However, the Demon Court's current deployment of the Celestial Stars Formation was obviously not for the purpose of destruction, but to capture him.

Once the Celestial Stars Formation was established, all celestial Stars would be in their control. Wouldn't finding Yu Yuan, hiding within the Star Core, be a breeze then?

With this thought, Yu Yuan immediately rose to his feet.

He knew he could no longer remain here.

He must find a way to leave the Ancient Star Domain, else he risked being trapped like a turtle in a jar.

By then, what faced him wouldn't just be the pursuit from the likes of the Kunpeng Ancestor, but that terrifyingly formidable Celestial Stars Formation!

Although he was quite curious to take a hit and test it out, he was afraid one test might be lethal.

After all, Reverse Action was not an invincible Defense.

Just as there isn't a shield in this world that cannot be breached.

If there were, it would only mean that the offensive power was not strong enough!

And that Celestial Stars Formation can indeed destroy Heaven and Earth—its offensive power is undoubtedly at the peak of extremity, a forbidding existence within the entire Primordial Heaven and Earth.

It was a Formation capable of threatening the existence of the Primordial Heaven and Earth!

After escaping from the Star Core, Yu Yuan split a strand of his Primordial Spirit into the body of the Demon Saint Ci Tie, while his True Body transformed into a strand of hair and hid among the hairs on Ci Tie's head.

With this disguise in place, he proceeded in the opposite direction intended, heading towards the Heavenly Court, expanding the coverage of his Divine Thought to the utmost, constantly vigilant of the surroundings.

With the Ancient Star Domain sealed off, leaving was no easy task.

Once his aura was captured, Donghuang Taiyi, with the Chaos Bell, could instantly appear before him.