The Dark Demon Lord, with his discerning eye, immediately realized that Lin Fei was at a crucial moment, even as the Eternal Realm itself was transforming. Therefore, he struck without hesitation, trying to shatter the Eternal Realm.

"Boom."

The strike was earth-shattering, a blow from a Supreme at the pinnacle of power.

Lin Fei's Eternal Realm trembled violently.

"Retrieve!" Lin Fei's gaze was icy as he willed with a mere thought.

"Whoosh."

Instantly, Lin Fei retracted the Eternal Realm, releasing all the Dark Demon Domain's Supremes contained within. He merely relocated the many Divine Realm Supremes to another part of the void.

"Hmm?" The Dark Demon Lord was slightly startled. He hadn't expected Lin Fei to withdraw the Eternal Realm, and he found himself unable to break it.

Watching this, the Dark Demon Lord's expression grew exceedingly grave. Although it was Lin Fei who had seemingly retreated, giving the impression that he was at a disadvantage and dared not confront the Dark Demon Lord directly, it was significant to remember that Lin Fei was still but a Martial Ancestor.

Yes, to this point, Lin Fei was only a Martial Ancestor.

Lin Fei had not reached the limits of the World's Great Dao, nor was he in a position to dominate the Divine Realm's Dao.

Yet, relying on the power of the Eternal Realm, he genuinely possessed a strength comparable to that of a Supreme. And with the Illusory Realm as well, Lin Fei was undeniably a threat—a substantial one.

"Lin Fei, have you succeeded?" Azure Emperor asked, his voice tinged with astonishment and insight.

Lin Fei appeared to have fled voluntarily, but he was facing the Dark Demon Lord, and within the Eternal Realm, there were many Supremes of the Dark Demon Domain.

Yet, Lin Fei had withdrawn effortlessly, even the Dark Demon Lord could not stop him. This spoke volumes.

How could he manage this without a power comparable to that of a Supreme? And not just any Supreme could achieve this.

Lin Fei nodded and responded, "Azure Emperor, I have succeeded. My Eternal Realm has already transformed, and in fact, the transformation isn't even complete yet. The Eternal Realm is growing stronger every moment.

Although I am not yet a match for the Dark Demon Lord, if I wish to leave, he cannot stop me. Moreover, I also want to test something. With the strength of my Eternal Realm, now comparable to a Supreme, combined with the power of the Illusory Realm, just what level can I reach? Can I slay a Dark Demon Domain Supreme on my own?"

Lin Fei was indeed eager to test his mettle. As for the Dark Demon Lord? He was unconcerned.

After all, the Dark Demon Lord couldn't kill him—moreover, Lin Fei still had the Illusory Realm. In an instant, he could immobilize most Supremes.

Then, with a sweep of the Eternal Realm, it was impossible for the Dark Demon Lord to trap Lin Fei in such a short span of time.

"Lin Fei, be cautious," Azure Emperor advised, though he did not attempt to stop him.

This venture was, in fact, their initiative—a deliberate strike against the Supremes of the Dark Demon Domain intended to provoke a supreme-level battle.

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The objective was to slay some of the Dark Demon Supremes, whether one or two, to dampen the Dark Realm's spirits and boost those of the Divine Realm.

They had initially joined forces to slay a Supreme of the Dark Demon Domain, but thereafter, they had achieved little, constantly on the defensive.

Now, with Lin Fei's qualitative transformation, it was indeed time for him to attempt and see if he could slay a Supreme of the Dark Demon Domain.

"Whoosh."

Lin Fei's figure flashed. His speed wasn't fast, but traversing through space was effortless for him. With a single step, he appeared right beside one of the Dark Demon Supremes.

"Be careful!" the Dark Demon Lord immediately shouted. For a regular Supreme, it was impossible to instantly kill another Supreme.

Lin Fei couldn't "instant kill" either. However, he had the Illusory Realm and the Eternal Realm. He didn't need to kill the Dark Demon Supreme instantly; he just needed to immobilize him.

"Illusory Realm!" Lin Fei's Illusory Realm descended.

"Boom."

Instantly, the body of the Dark Demon Supreme stiffened slightly. Then, under the suppression of the Illusory Realm, the Supreme's gaze grew vacant, clearly overwhelmed by Lin Fei's power.

"Whoosh."

But this was just the beginning. The next moment, Lin Fei's Eternal Realm flickered slightly, directly pulling the Dark Demon Supreme into the realm within his body.

"Suppress!" Within the Eternal Realm, Lin Fei harnessed the power of the entire world.

"Rumble..."

An entire True Monarch-level world—this was no ordinary True Monarch realm. Lin Fei wielded the full power of the Eternal Realm to suppress and grind away the body of a Supreme from the Dark Demon Domain.

By the time the Dark Demon Lord arrived, Lin Fei had already retracted the Eternal Realm and returned to stand before Azure Emperor.

Within Lin Fei's Eternal Realm, he could clearly "see" the Supreme of the Dark Demon Domain struggling continuously.

However, under the overwhelming suppression of the Eternal Realm, the Supreme's body was gradually disintegrating. The essence of his vanquished flesh was being absorbed and utilized by the Eternal Realm.

One breath, two breaths, three breaths...

Time flowed swiftly. Before long, eight breaths had passed, and Lin Fei's Eternal Realm had obliterated the last traces of the Dark Demon Supreme's flesh.

There was no longer any sign of the Dark Demon Supreme within Lin Fei's realm.

He was dead. The Supreme of the Dark Demon Domain had perished, silently and utterly without resistance. The combination of the Illusory Realm and the Eternal Realm proved terrifyingly powerful.

"What have you done?" The Dark Demon Lord was both shocked and enraged. He could sense that the Supreme of the Dark Demon Domain, suppressed by Lin Fei's Eternal Realm, was dead—at least within the Divine Realm. He could only be reborn within the Dark Heart of the Dark Demon Domain. But how long would it take to cultivate a new Supreme?

How much energy would it require? Even for the Dark Demon Domain, this was not an easy task. It was a severe blow.

"It worked, it really worked!" Azure Emperor exclaimed, laughing joyously. "Lin Fei, you've actually managed to slay a Supreme of the Dark Demon Domain by yourself. There's hope for us yet, our Divine Realm is saved. Even if the Dark Demon Lord is strong and Lin Fei cannot kill him, what about the other Supremes?"

"With Lin Fei here, each Supreme of the Dark Demon Domain that appears will be slain one by one. Let's see how many Supremes the Dark Demon Domain still has left. Even the Dark Demon Lord can't so easily dominate and slay Supremes!"

Azure Emperor and the others were overjoyed, their eyes wide with astonishment. Slaying a Supreme!

They had just witnessed Lin Fei slaying a Supreme with their own eyes, and the ease with which Lin Fei dispatched his foe was shocking.

He had merely employed the Illusory Realm combined with a sweep of the Eternal Realm to eliminate a Supreme, and all this under the watchful eye of the Dark Demon Lord. How could they not be astounded?

The remaining Supremes of the Dark Demon Domain, their faces ashen, quickly gathered together, fearing that Lin Fei might strike again and annihilate them all.

"Well done, Lin Fei!" the Dark Demon Lord sneered. "So long as our Supremes stick together, what can you do?"

"Do you plan to huddle together at all times?" Lin Fei countered. "The moment any of you are alone, you're dead. I can also slay the Supremes of your Divine Realm. Do you truly wish for mutual destruction?"

The Dark Demon Lord began to threaten Lin Fei, but Lin Fei remained composed, his tone even and calm, "Dark Demon Lord, if you truly can slay the Supremes of my Divine Realm, then go ahead. Let's see how many cards you have left to play and how many Supremes you can kill. Let's also see which of us will have any Supremes left."

Lin Fei was undeterred by the threat. On the contrary, he subtly hinted that he knew slaying a Supreme was not an easy task for the Dark Demon Lord—it would surely come at a great cost, perhaps involving the use of exceedingly rare treasures. Either scenario would be disadvantageous for the Dark Demon Lord!

Should it come to a massacre, Lin Fei could systematically slay each invading Supreme from the Dark Demon Domain, leaving none alive. But did the Dark Demon Lord possess the courage for such an action?