"Dark Emperor?" Lin Fei recognized it immediately. The figure cloaked entirely in black was unmistakably a Demon Emperor—and an unusual one at that.

"Great Dream Sect's Lin Fei! I am Nightmare Emperor!" he announced. "I have finally caught you, using a group of dark demons as bait to lure you out. You are indeed cautious. But, it ends here. After today, the Divine Realm will no longer bear your presence!"

Nightmare Emperor spoke slowly, his steps deliberate yet filled with overwhelming pressure as he advanced toward Lin Fei.

Lin Fei's expression was solemn. He could see that Nightmare Emperor was formidable, unlike any Demon Emperor he had faced before. The pressure was immense, and it seemed that Nightmare Emperor had specifically used the group of dark demons to attract Lin Fei.

While Lin Fei had been merely sweeping through the Yin-Yang Immortal Domain, encountering this group of dark demons had been purely coincidental. Whether by chance or by arrangement, it didn't matter now. Lin Fei and Nightmare Emperor had met, and that was enough!

Nightmare Emperor's intent was clear—to completely eliminate Lin Fei, removing the threat he posed once and for all. Moreover, since Nightmare Emperor dared to speak so confidently, he must possess strength far surpassing ordinary Demon Emperors.

"Die, Night of Sorrow!" proclaimed Nightmare Emperor as he finished speaking.

"Boom."

The earth shook, and the void itself seemed to shatter. It was as if even the light disappeared without a trace. Infinite darkness surged forward, engulfing everything in profound blackness. Even Lin Fei couldn't see his surroundings.

"What a strange technique!" Lin Fei thought, feeling a twinge of anxiety. This was a situation he had never encountered before. He had always been sweeping through the Yin-Yang Immortal Domain, effortlessly slaying countless Demon Emperors, thinking them rather trivial and wondering how they dared invade the Divine Realm.

But now, Lin Fei realized—it wasn't that the dark demons were inherently weak; rather, the top-tier Demon Emperors had not yet made their appearance. Nightmare Emperor, undoubtedly one of the elite, was proving to be a true challenge, capable of suppressing Lin Fei.

Yes, Lin Fei was being suppressed. If he couldn't break through this darkness quickly, it meant he was indeed being overpowered. However, Lin Fei naturally had his own methods.

As Lin Fei invoked his Eternal Realm, he felt a continual surge of strange and insidious power that seemed to erode the very fabric of his realm. This force was pervasive, infiltrating from all directions, relentlessly eroding everything in its path.

For any other Martial Ancestor or True Immortal, withstanding such a sinister force might have been impossible. The longer one remained in this darkness, the more susceptible they became to its corrupting influence.

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However, Lin Fei was different. He was a world unto himself. How difficult would it be to erode an entire world?

Thus, once Lin Fei transformed into his world form, the dark powers could erode as they pleased—it posed no threat to him.

Yet, the hidden Nightmare Emperor within the darkness was a severe danger, capable of threatening Lin Fei.

Lin Fei had to not only withstand the dark power's erosion but also break through it completely to slay Nightmare Emperor.

At this moment, Lin Fei's Eternal Realm was indeed powerful, but to fully unleash it and combat Nightmare Emperor's dark powers, Lin Fei was not absolutely confident of victory.

If those dark forces managed to erode into Lin Fei's Eternal Realm completely, the resultant damage could be catastrophic. The Eternal Realm was Lin Fei's foundation; he could not risk it.

However, while the Eternal Realm could not be risked, the Illusory Realm was a different matter. In times like these, the Illusory Realm was crucial because it was ethereal and could not be eroded. If the Illusory Realm could envelop or intimidate Nightmare Emperor, it wouldn't need much time.

Just holding Nightmare Emperor at bay would be enough to prevent the sinister dark power from significantly impacting Lin Fei's Eternal Realm. That would be sufficient!

The next moment, Lin Fei took a deep breath. He hesitated no longer.

"Illusory Realm!"

"Buzz."

As Lin Fei's words fell, the Illusory Realm descended, instantly covering thousands of miles. With the current scope of Lin Fei's Illusory Realm, covering this area was as easy as flipping his hand.

Lin Fei was ensuring absolute security, sparing no effort to expand the range of the Illusory Realm to guarantee that it could completely envelop Nightmare Emperor.

Indeed, Nightmare Emperor was hiding within the darkness.

With a resounding "Boom," Nightmare Emperor made his move. Within the shroud of darkness, he approached Lin Fei silently. His massive form, enveloped in swirling dark mists, collided violently with Lin Fei's Eternal Realm.

"Crack."

The Eternal Realm shattered.

Dark, eerie forces surged into the realm. However, at that very moment, the Illusory Realm descended. Upon its arrival, Nightmare Emperor's body stiffened slightly.

Even as an emperor, with a will of steel, he could not fully withstand the Illusory Realm. His expression struggled; his gaze became distant. Yet, he was unmistakably 'shaken' by the Illusory Realm. There was no doubt about it, as evidenced by the halted encroachment of the surrounding darkness.

The eerie dark forces seemed to lose their invasive power.

Meanwhile, Lin Fei was dealing with the troublesome dark forces invading his Eternal Realm. But now, they abruptly ceased. Lin Fei's eternal power could easily dispel the darkness.

"Has the Illusory Realm succeeded?" Lin Fei wondered, quickly deducing the reason. The Illusory Realm had likely succeeded in immobilizing Nightmare Emperor.

Lin Fei did not know how long this effect would last, but it was undoubtedly an opportunity!

"Boom."

Lin Fei's Eternal Realm unleashed its full power in an instant. He summoned the strongest force of his realm. With his most potent strike, the surrounding darkness was expelled by Lin Fei's Eternal Realm. He saw Nightmare Emperor, his gaze vacant, clearly shaken by Lin Fei's Illusory Realm—a rare opportunity.

"Thud."

Finally, Lin Fei's Eternal Realm crashed down upon Nightmare Emperor. As a Great Emperor, Nightmare Emperor's strength was formidable.

However, it was futile. Lin Fei's Eternal Realm had evolved, alive with newfound power, its strength immeasurably enhanced. A single strike from the entire world—how could Nightmare Emperor withstand it?

Thus, with that single blow, the Nightmare Emperor's form collapsed instantly, disintegrating into dust. Unable to fully unleash his own abilities, the Nightmare Emperor never had the chance to reveal the full extent of his strength.

The result? He was obliterated by a single strike from Lin Fei.

To reappear would require rebirth within the heart of the dark demons—a time frame unbeknownst to all.

Today, Nightmare Emperor met a dismal defeat!