Two figures landed like lightning beneath the colossal Ancestral Heaven Divine Luo Tree. Nie Kong's spiritual sense swept out, and he immediately detected the presence of the Spirit Vein.

The Spirit Vein emerged from the base of the giant tree, piercing through the spatial barrier, snaking underground within the Spirit Guardian City, eventually fragmenting into countless fine streams that dispersed throughout the entire Sirius Mountain Range.

"Nie Kong, follow me."

Wood Ancestor moved his will, and a dense wave of verdant energy enveloped both their figures. The next instant, Nie Kong found himself and Wood Ancestor drawn into the Spirit Vein itself.

The Spirit Vein, astonishingly, was located within one of the main roots of the Ancestral Heaven Divine Luo Tree. Countless fine tributary Spirit Veins converged around this main root.

Every single root, whether large or small, was itself a Spirit Vein. The main current and all tributaries merged to form the complete Yin Ruins Spirit Vein. This Spirit Vein had completely merged with the Ancestral Heaven Divine Luo Tree.

Following the massive root, Nie Kong and Wood Ancestor shot upwards against the current like meteors. In a flash, they reached the tip of the root and their movement abruptly halted.

Directly ahead was a pool, dozens of meters in circumference, forming a jade-green spring head. The tips of all the roots of the Ancestral Heaven Divine Luo Tree were gently inserted into this pool, and the fine streams of the Spirit Vein surged up through these roots like a fountain.

"This is the source of the Spirit Vein."

Wood Ancestor pointed to the spring head, then suddenly leaped in, his figure instantly enveloped by the jade-green essence. Nie Kong did not hesitate, following closely behind Wood Ancestor into the spring head.

The vitality contained within this spring head was overwhelmingly concentrated. Yet, besides this vitality, there was absolutely no trace of any other power signature present. Nie Kong frowned slightly in surprise, only to find that he and Wood Ancestor had already reached the bottom of the spring head.

Noticing Nie Kong's expression, Wood Ancestor chuckled, "It took me hundreds of years of continuous cultivation before I even sensed the existence of that specific power. However, you cultivate the most fundamental Chaos Divine Power in heaven and earth, and now that you are a Supreme Venerable, you should be able to sense it quite quickly."

"Let me try."

Time was pressing, so Nie Kong was not overly polite. He immediately sat down cross-legged, eyes slightly closed, his mind completely immersing and merging with the spring head. Minutes later, Nie Kong opened his eyes in vain. Despite his power as a Supreme Venerable, he had discovered nothing here? It was genuinely bizarre. According to Wood Ancestor's words, there should be some kind of space here.

"Boom…"

Even from this location, Nie Kong could still hear the faint, continuous sounds emanating from the Gate of Worlds. Nie Kong felt anxious, his mind racing.

"Nie Kong, you must try for a longer time. Although I know the root merges with that spatial barrier, my eyes have never seen that space, nor has my spiritual sense ever detected it."

Although Wood Ancestor still did not know what the "Chaos Immortal Spirit" was, Nie Kong's expression had somewhat affected him, and his tone was heavy.

"Nihility Secret Realm?"

A flash of inspiration suddenly crossed Nie Kong's mind, and he blurted out these four words, his spirit greatly shaken. "I understand now; what exists here must be the Nihility Secret Realm!"

Regarding the "Nihility Secret Realm," Nie Kong had once heard Immortal Bamboo Sound mention it. That "Chaos Immortal Spirit" was formed by the cultivation of "Chaos Immortal Qi" into a spirit, and the "Chaos Immortal Qi" itself was originally derived from the Nihility. After advancing to the Taiyi Realm, he had once drawn a massive amount of "Chaos Immortal Qi" and returned it to the Nihility, condensing it into an independent space called the "Nihility Secret Realm."

The Nihility Secret Realm was analogous to Grand Thunder Dragon Supreme Venerable's "Grand Thunder Sound Palace." However, the two were fundamentally worlds apart. The Nihility Secret Realm was like a void. Not only could it not be seen or touched, but even knowing it was right before one's eyes, one's spiritual sense could not detect its existence. This scenario perfectly matched Wood Ancestor's description just now.

When Immortal Bamboo Sound mentioned the "Nihility Secret Realm" back then, she had assumed this independent space had already collapsed. But now, it appeared Immortal Bamboo Sound's guess was clearly wrong; that "Chaos Immortal Spirit" likely used the "Nihility Secret Realm" to evade the spiritual sense searches of the Void-Penetrating Supreme Venerable and Pangu Supreme Venerable.

"Nihility Secret Realm?"

Hearing this unfamiliar name spring from Nie Kong's mouth, Wood Ancestor frowned suspiciously.

At this moment, Nie Kong had closed his eyes again. However, this time, he did not use his spiritual sense. Instead, he pushed the "Chaos Divine Art" to its absolute maximum.

An instant later, a milky-white Chaos Divine Power surged out from his body. Under the effect of the "Chaos Divine Art," this divine power rapidly transformed into wisps and threads of "Chaos Immortal Qi," which zipped swiftly through the spring head. In the blink of an eye, the spring head was saturated with dense Immortal Qi.

"Hoo!"

With a thought from Nie Kong, the slightly chaotic "Chaos Immortal Qi" gathered together, then all vibrated at the same frequency. If the "Nihility Secret Realm" truly existed here, facing the stimulus of so much "Chaos Immortal Qi," it absolutely could not remain unresponsive.

Indeed—

"Buzz!"

After one or two seconds, a dissonant sound appeared amidst the whistling of the Immortal Qi. This noise was extremely faint. But since it had appeared, how could it escape the perception of a Supreme Venerable? The moment he captured this sound, Nie Kong knew it was the sound of spatial vibration. An independent space did indeed exist here.

"Nie Kong, you little fellow certainly has a way."

Wood Ancestor couldn't help but smile, and a trace of joy appeared in his ancient eyes. He, like Nie Kong, had heard that slight sound.

"Buzz!"

Another humming resonance sounded. Immediately after, the joy in Wood Ancestor's eyes was replaced by astonishment: "Nie Kong, that power is emerging… so much of it coming out all at once!"

The moment Wood Ancestor spoke, Nie Kong had already sensed it. The power flowing out from the "Nihility Secret Realm" was actually in liquid form. Within it, there was the faint trace of a "Chaos Immortal Qi" aura, but the outer layer of that power was dyed emerald green by the dense vitality, making it look almost identical to the Spirit Vein in the spring head. If it weren't for the surrounding pervasive Immortal Qi, Nie Kong would have nearly missed it.

"Hoo!"

Nie Kong's figure flickered, his right hand extended and then retracted, and that power was instantly held in his palm. It was only the size of a walnut, perfectly round, like a drop of water. After a slight probing, Nie Kong understood: although it contained a slight hint of "Chaos Immortal Qi," its essence was a mass of Nihility.

The so-called Nihility did not mean it was just air. It bore some similarity to the "Nihility Secret Realm." However, the "Nihility Secret Realm" was an independent space, while this was a marvelous mass of power. If the vitality wrapping its surface were removed, and there was no Chaos Immortal Qi present, even Nie Kong could not sense this power. If Nie Kong was not mistaken, "Chaos Immortal Qi" was generated from such a Nihility.

Anyone could absorb this power, provided they could discover its existence. Now, Nie Kong finally understood why Wood Ancestor, despite having the strength to pass the Spirit Tribulation and advance to Spirit God status in his time, insisted on suppressing his cultivation realm and remaining here to cultivate. With such a power available for absorption, even he would be reluctant to leave!

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