Lin Fei, having calculated the time, confirmed it had indeed been three days. He generally trusted the Heart Demon Martial God and was pondering whether the latter intended to renege on the agreement.

At that moment, the Heart Demon Martial God arrived. Presenting himself personally, he expressed relief upon seeing Lin Fei, "I've finally made it in time."

"To secure the five Saber Worlds for you, Lin Daoist Friend, I've incurred a great cost," the Heart Demon Martial God revealed. He then handed over the five Saber Worlds to Lin Fei, who was quite pleased with them.

"Excellent, these are indeed the five Saber Worlds," Lin Fei remarked, praising the Heart Demon Martial God for his reliability. "However, there's one small favor I hope you can do for me."

"What favor?" asked the Heart Demon Martial God.

"Experience my Saber World," Lin Fei said, not allowing the Heart Demon Martial God any time to react.

Lin Fei's Saber World instantly expanded and enveloped the Heart Demon Martial God. The latter, caught by surprise, wondered why Lin Fei had suddenly made a move against him. Lin Fei remained silent, intensely observing the Heart Demon Martial God. He didn't use the power of the nineteen hundred particle worlds within him but solely relied on the Saber World and the power of the Ten Directions Heavenly Formation, unleashing the mirage beast's illusionary arts along with the Saber World's suppressive and sealing forces.

With Lin Fei's current mastery of the Saber World, it was indeed possible to suppress the Heart Demon Martial God, although it would take time and allow for some resistance from him.

But now, things were different. As Lin Fei's Saber World enveloped the Heart Demon Martial God, the latter seemed to lose all sense of action, appearing utterly bewildered, as if trapped in an illusion. Indeed, he had fallen into an illusion.

Lin Fei was astonished, knowing well that the Heart Demon Martial God was extremely proficient in illusionary techniques and even possessed the Law of Illusion. Yet, he had been ensnared in the illusion within Lin Fei's Saber World, which was merely the power of a juvenile mirage beast.

After a few breaths, the Heart Demon Martial God shuddered and then regained clarity in his eyes.

"Wait, I just fell into an illusion created by the mirage beast?" he said in disbelief. Lin Fei nodded slightly, confirming, "You've finally come to your senses. You were indeed pulled into the illusion by the mirage beast."

Although the Heart Demon Martial God had recovered, the few moments he had spent trapped in the illusion would have been enough for Lin Fei to defeat him countless times in battle.

Moreover, Lin Fei was pleasantly surprised to find that even in its juvenile stage, the mirage beast's illusionary power was formidable enough to overcome the Heart Demon Martial God. What would its capabilities be once it continued to grow?

This was indeed a pleasant surprise, and Lin Fei's initial idea was not wrong. The fusion of the mirage beast with the Saber World, even in the form of a formation core, had significantly transformed the Saber World.

While this might not aid Lin Fei in transcending tribulation, it would be incredibly effective against various opponents, whether they be Martial Gods, Deity Transformation cultivators, or exotic beasts. They would all find it exceedingly difficult to face Lin Fei. His Saber World was already strong, and now, with the addition of the mirage beast's illusionary arts, it had become even more formidable. How could anyone contend against it?

"Thank you for your assistance, friend Mi Tian," Lin Fei said calmly.

However, the expression on the Heart Demon Martial God's face was complex. "You've already mastered the use of the mirage beast's power and even integrated it with your Saber World. Anyone who becomes your opponent..." He shook his head as if contemplating a nightmare. The Heart Demon Martial God certainly did not wish to become Lin Fei's enemy.

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After leaving Lin Fei, the Heart Demon Martial God seemed inspired to return and study the mirage beast's lineage, striving to understand the Law of Illusion more profoundly. He could no longer afford to be vulnerable to Lin Fei's illusions within the Saber World.

Lin Fei, returning to his secret chamber, was quite satisfied with the integration of the mirage beast and his Saber World, meeting his expectations. He didn't waste the five Saber World sanctuaries he had received, immediately integrating them with his own Saber World. This significantly increased its power, aiding him in facing his fifth heavenly tribulation.

However, Lin Fei was not in a hurry to undergo the tribulation. Having tasted the benefits of the world's origin energy before, he was keen on acquiring a significant amount again.

Lin Fei visited the Great Dream City, where many missions involved recruiting companions to contest for world origin energies.

However, Lin Fei's standards had risen; a mere small world did not interest him much in terms of world origin energy. His last venture into the True Spirit Realm, nearly equivalent to ten small worlds, set his benchmark.

Therefore, he sought a powerful small world, preferably one comparable or even superior to the True Spirit Realm, especially one nearing collapse for quick access to its world origin energy.

Finding a world that met Lin Fei's criteria was not easy. For instance, the currently popular Hevenly Secret Realm was said to be even more powerful than the True Spirit Realm, attracting many Deity Transformation and Martial God cultivators for its world origin energy.

However, it required extensive planning over thousands of years, which Lin Fei lacked the patience for. Therefore, he dismissed the Heavenly Secret Realm from his consideration.

Next, Lin Fei considered the Seven-colored Realm, which had been contested for thousands of years without signs of imminent collapse. He ruled it out as well. Many other small worlds were too weak to pique his interest. After a thorough evaluation, only one small world barely met Lin Fei's criteria: the Heavenly Principle Realm.

The Heavenly Principle Realm was roughly half the size of the True Spirit Realm, and its world origin energy was likely half as much. However, it was still a considerably large small world, and crucially, it was on the brink of collapse. Many Martial Gods from the Great Dream Sect were already involved, and the sect was seeking additional support.

Lin Fei contemplated, "If I collaborate with several Martial Gods, how much of the world origin energy would I actually receive, considering the small size of the Heavenly Principle Realm?" He realized that if he acted alone and dominated the Heavenly Principle Realm, even though it was smaller than the True Spirit Realm, he could potentially obtain the same amount of world origin energy as he did in the True Spirit Realm.

His eyes lit up with this realization. In the True Spirit Realm, he had only acquired half of the world origin energy, roughly equivalent to the total world origin energy of the Heavenly Principle Realm. Thus, Lin Fei harbored a bold idea: he didn't want to collaborate with others; he aimed to monopolize the world origin energy of the Heavenly Principle Realm.

However, the situation in the Heavenly Principle Realm was complex, with many forces involved and plans that spanned thousands of years. If Lin Fei interfered and attempted to take over the entire realm, would those people and forces agree?

Moreover, it could potentially involve True Monarchs, as it was unlikely that these forces and individuals didn't have True Monarchs backing them. Nevertheless, Lin Fei had his own backing; he was a member of the Great Dream Sect.

Under normal circumstances, a True Monarch wouldn't personally intervene against a Martial God. But those were just ordinary situations. If provoked, a True Monarch might indeed take action. Martial Ancestors and True Immortals need not be feared; their intervention would surely draw the attention of the Great Dream Ancestor. After all, their involvement would be seen as excessive bullying, a concept entirely different from a True Monarch's potential engagement.

"True Monarch..." Lin Fei murmured. True Monarchs were powerful, capable of shattering the void or comprehending the secrets of the vacuum. However, if Lin Fei obtained the world origin energy from the Heavenly Principle Realm and survived his fifth heavenly tribulation, his power might soar to the level of shattering the void. He was already nearing the limit of a Martial God. Even if his power post-fifth tribulation didn't match a True Monarch's, it wouldn't be far off. If a True Monarch did intervene, Lin Fei believed he could withstand it.

"There's no way to be completely risk-free," he thought. "The Initial Evil True Monarch dominated a small world with tens of thousands of avatars. I don't have that many avatars. Perhaps I need to collaborate with a Deity Transformation cultivator."

Lin Fei thought of North Wind True Person, but he had passed away. Finding another Deity Transformation cultivator might be possible, but the thought of sharing the spoils with another made Lin Fei somewhat reluctant.

"Wait, can my Saber World now envelop an entire small world? If I expand the Saber World without regard for its power, even covering the whole small world, just to collect the world origin energy, that should be feasible, right?"

A flash of inspiration struck Lin Fei. He had thought of a plan!