The Upper Realm, as a whole, possessed power comparable to a Colossus from Antiquity and held boundless potential far surpassing that of a Chaos Primordial Great World by an immeasurable degree. It could nurture and give birth to countless geniuses and prodigies.
In fact, generally speaking, Ancient Chaos Universes that possessed an Upper Realm often saw the Upper Realm itself nurture and give birth to the vast majority of the Supreme Ones within that universe.
Of course, the Upper Realm was not individually nurtured and born by the Chaos Sea. Typically, it belonged to the category of a companion great world to an Ancient Chaos Universe.
There was a particular saying: the Upper Realm was actually also an Ancient Chaos Universe, but it was like a naturally disabled fetus. Unable to be completely and perfectly nurtured, it was born prematurely, ultimately becoming a lesser existence—the largest celestial world second only to the Ancient Chaos Universe itself.
Compared to it, even a Chaos Primordial Great World fell short by countless magnitudes.
However, Ancient Chaos Universes capable of companion-birthing an Upper Realm were exceedingly rare within the vast Chaos Sea.
Examples included the Pangu Universe, the Primordial Immortal Realm, the Alien Race Ancient Universe, and the Chaos Burial Ground, among others.
Yet, any Ancient Chaos Universe that companion-birthed an Upper Realm invariably ranked among the most powerful Ancient Chaos Universes. The four mentioned above all fell into this category.
Especially the Primordial Immortal Realm. Its companion Upper Realm land was jointly integrated by the various immortals and Immortal King Giants of that realm, merging it completely with the entire Ancient Chaos Universe to evolve into an unprecedented Immortal World Universe.
Thus, implicitly, the Primordial Immortal Realm held the reputation of being the number one universe in the Chaos Sea.
However, what was puzzling was this: why would such an Upper Realm embryo, something that would make even Colossi from Antiquity covetous and envious, be transformed into a Giant's secret realm and placed within the battlefield of the two ancient domains?
It had to be said, this was astonishing and felt very strange.
"Something is off," Huang Di frowned, feeling the matter was far from simple. "An Upper Realm, even just an embryo, contains infinite growth potential. A Colossus from Antiquity shouldn't casually leave an Upper Realm embryo here, much less transform it into a Giant's secret realm. What purpose could there be? Even if this concerns the struggle for the 'Ultimate Supreme One' immortal fate, such an extravagant gesture still seems excessive."
At this moment, Huang Yao also spoke: "If I'm not mistaken, perhaps it was done out of necessity."
"Out of necessity!?"
"Correct!" Huang Yao continued. "The Upper Realm belongs to the supreme companion great world of an Ancient Chaos Universe. Similarly, only an Ancient Chaos Universe can truly nurture it into existence. If I'm not mistaken, this Upper Realm embryo likely lost its companion Ancient Chaos Universe, which has already been destroyed. It lost the root source needed to grow into a complete Upper Realm."
An Ancient Chaos Universe companion-birthed an Upper Realm.
But the vast, boundless expanse of an Upper Realm could only be successfully nurtured and grown by an Ancient Chaos Universe.
Having lost its Ancient Chaos Universe, the Upper Realm embryo was like a plant losing its most fundamental soil, unable to continue its nurturing and growth.
Even a Colossus from Antiquity could not accomplish this, unable to propel the continued nurturing of the Upper Realm embryo.
Huang Di was surprised: "Couldn't it just be placed inside another Ancient Chaos Universe?"
The Heaven-Defying Battle King shook his head: "Very difficult. Because the Upper Realm and the Ancient Chaos Universe are companion entities, their root source attributes generally need to be consistent for optimal nurturing. The fundamental source attributes of each Ancient Chaos Universe actually differ somewhat. Moreover, generally speaking, Supreme Emperors or Colossi from Antiquity would not permit it. For an Upper Realm embryo to evolve into a complete Upper Realm, the amount of universe origin it would consume is immeasurable. Directly inserting it would, to a great extent, cause the universe's origin to fall into a depleted state, leaving the entire Ancient Chaos Universe unable to recover for several Era Epochs."
"During those several Era Epochs, the state of cultivators would be interrupted, equivalent to falling into a period of declining Dharma. And this period would last for several full Era Epochs—far too long."
"One must understand that within the Chaos Sea, the various Ancient Chaos Universes are not absolutely peaceful. Take the Pangu Universe and the Alien Race Ancient Universe as examples. If an entire Ancient Chaos Universe fell into a prolonged fracture lasting several epochs, leading to a lack of subsequent strength and the absence of powerful experts, it would be highly susceptible to invasion and occupation by other Ancient Chaos Universes. All the hard work spent nurturing and growing the Upper Realm would then become someone else's possession for nothing."
The three understood. Even knowing that a fully grown Upper Realm would inevitably and continuously nurture countless experts, even cultivating Supreme Emperors and Colossi from Antiquity, no Ancient Chaos Universe was willing to take the long-term risk spanning several Era Epochs to do this.
The risk was too great.
Ye Chen frowned: "In that case, if a Colossus from Antiquity refined it, merging their origin Emperor World with the Upper Realm embryo to provide growth power, wouldn't that work?"
The Heaven-Defying Battle King sighed: "Very difficult. The energy required for an Upper Realm embryo to nurture and grow is immense. Even an Ancient Chaos Universe's origin would be depleted for several epochs. How much more so for a Colossus from Antiquity? If one truly attempted to completely refine it, there's a nine out of ten chance they would be forced to have too much of their origin power devoured, falling into a prolonged slumber, perhaps not awakening for several Era Epochs. Imagine, if a Colossus from Antiquity slumbers for several epochs and struggles to revive, what if enemies attack?"
Ye Chen sighed: "Is there really no other method?"
Leaving such an Upper Realm embryo here was truly a waste.
Huang Yao said: "Of course, it's not completely without a solution. As long as one finds a Chaos Universe that is currently in the process of being nurtured and places this Upper Realm embryo inside, it can be done."
"After all, a Chaos Universe in its nurturing and growth period has origin attributes still in the process of formation, making it easiest to fuse with the Upper Realm embryo."
Hearing this, a light flashed in Ye Chen's eyes: "Really? But can a Chaos Universe in its nurturing period propel the growth of the Upper Realm embryo? Wouldn't it require an even longer time?"
He wasn't without this thought. A fully grown Ancient Chaos Universe also required several Era Epochs to propel the Upper Realm embryo into a complete Upper Realm, let alone just a Chaos Universe embryo.
"Battle Saint King, your perspective is mistaken," the Heaven-Defying Battle King said. "An Ancient Chaos Universe propelling the nurturing and growth of an Upper Realm embryo consumes Chaos origin. However, a Chaos Universe embryo itself requires the support of the Chaos Sea for its growth, having the entire Chaos Sea as its backing. In a sense, if an Upper Realm embryo is directly inserted into a Chaos Universe embryo, even though the Upper Realm embryo requires vast amounts of origin for growth, the Chaos Universe embryo can also rely on the aid of the endless Chaos Sea to rapidly recover."
"To put it simply, the moment the Chaos Universe successfully completes its growth is also the moment the Upper Realm becomes completely whole."
How could Ye Chen not be overjoyed?
Because he himself possessed a Chaos Universe embryo—his origin small universe, which was currently in its nurturing and growth stage.
If he placed this Upper Realm embryo into his own origin universe, didn't that mean his future Chaos small universe had a great chance of growing to a stage comparable to the most powerful universes like the Pangu Universe, the Alien Race Ancient Universe, and the Primordial Immortal Realm?
Originally, he had planned for the Chaos Saint Realm or the Ancient Heavenly Realm to become the Upper Realm land of his origin universe.
But now, this Upper Realm embryo was the most perfect future universe Upper Realm.
It could be said to be the greatest gift heaven had sent him!
Naturally, even at this point, his secret of possessing an origin small universe had not been completely revealed to the world.
The matter was of grave importance; the three before him could not yet be trusted as completely as the Imperial Sons and Daughters of the Pangu Universe.