To open a permanent passage between the worlds of Yin and Yang, a Gate of the Underworld (鬼门关) is essential. In the netherworld, these gates are actually wondrous treasures of heaven and earth, possessing unfathomable power. Each Gate of the Underworld guards a passage between the realms of Yin and Yang.
It is said that, in the past, every Gate of the Underworld could lead to any desired location, acting as the netherworld's top-tier teleportation device—the most advanced interdimensional gate.But now, that's no longer the case. A single gate can only correspond to one realm.No one knows the exact reason, though some believe it's due to the universe having expanded countless times over, becoming too vast for the gates to cover. The power of the Gate of the Underworld is no longer sufficient to span the entire Eternal World—unless the user has attained a level of power beyond imagination.
"Perhaps there truly exists a Gate of the Underworld leading to your Great Yi Dynasty," said Meng Qi, shaking her head. "But I don't know which one it is. And besides, these gates cannot be opened at will. Not everyone is qualified to pass through them. Without a Yin-Yang Token (阴阳令), it's impossible to open the gate."
Establishing ties with Great Yi and creating mutual exchange, especially trade between the Yin and Yang realms, would generate unimaginable profits—enough to allow any power to rise rapidly. But without a stable channel, such dreams are nothing but illusions. Nothing can last without one.
Of course, the Gate of the Underworld isn't the only means of connecting the Yin-Yang realms.
"Yes, that is the greatest difficulty in bridging Yin and Yang. Even possessing a gate comes with huge limitations. Madam, you're a person of vast experience—might there be any other way to construct a stable connection between Yin and Yang?"Yi Tianxing nodded thoughtfully.Now that he was in the underworld, laying down some groundwork would be wise. To miss this opportunity would be a waste.
"Indeed, there is," Meng Qi replied after a moment of thought. "I remember a treasure called the Yin-Yang Bridge (阴阳桥), which can directly traverse and link both realms. With it, one can pass freely between Yin and Yang. However, to reach such a level, the artifact must be cultivated and enhanced—it's not something an ordinary magical treasure can accomplish. And its evolution is extremely difficult."
"There's also another item," she added. "The Six Paths Reincarnation Disk (六道轮回盘)."
"Wait—the Six Paths Reincarnation Disk? Isn't that the ultimate treasure of reincarnation that governs all rebirth? There's no way we could possibly get something like that," Yi Tianxing interjected.
"You may not know this," Meng Qi explained with a smile, "but the supreme law of the underworld is the Dao of Reincarnation. The Six Paths Reincarnation Disk is merely one manifestation of this Dao. Just like the Rebirth Platform and the Endless River of Souls, it is derived from the same source. The Dao of Reincarnation is singular, but its treasures are not. There can be multiple embodiments."
In other words, if one has the chance to obtain such an item—or the method to refine it—one could forge their own version. Its power would depend entirely on personal fortune and skill.Still, the Six Paths Reincarnation Disk was immeasurably precious. It was said that the disk wielded by the underworld's own officials was a primordial innate treasure, peerless in all realms. Other replicas could not compare.
There also existed a similar item known as the Six Paths Reincarnation Diagram (六道轮回图).
"Does Madam perhaps possess the Six Paths Reincarnation Disk, or even the Yin-Yang Bridge? If so, I'm willing to offer a worthy price. Establishing a passage between realms benefits both of us," Yi Tianxing said, his voice tinged with desire.
A reincarnation treasure—if obtained—would be a harvest beyond imagination.
"I do not have the Reincarnation Disk," Meng Qi admitted. "But I can inquire with my family's elders. It will take time, but if I receive word, I'll inform you at once."
"As for the Yin-Yang Bridge—yes, I do have one," she added. "However, it is currently only a Yellow-grade treasure. With its current grade, it cannot yet achieve inter-realm traversal. Cultivating it will not be easy."
As she spoke, a flash of light appeared in her hand. A bridge radiating black and white light emerged—engraved with mysterious runes, interwoven in a mesmerizing dance of Yin and Yang.
"This is the Yin-Yang Bridge," Yi Tianxing murmured, his heart stirred.
"What's the price? Name it. I must have it."
"This bridge will cost ten million Eternal Coins. But keep in mind—only once it evolves into an Earth-grade treasure, a true Innate Spirit Treasure, will it have enough power to breach the barriers between Yin and Yang."
Because of the difficulty in nurturing it and the time required, the only benefit for now would be its future potential.
After some final negotiation, Meng Qi departed.The information she'd gained today was equally important for her. A deal of this scale was not something she could handle alone—she had to report to her family, especially about the Reincarnation Disk.
The first Fortune Dynasty of mankind, the foremost imperial dynasty in the world—such a trading partner was worthy of all seriousness.
After she left, Yi Tianxing held the Yin-Yang Bridge in his hand, feeling its inherent mystical power. It was born with innate restrictions, markings that allowed it to grow over time. Nurturing it would require vast quantities of Yin-Yang-aligned materials to feed it, evolving its grade step by step.
But Yi Tianxing made a bold decision.
"There's no need to cultivate it slowly. I'll directly refine it into a Heaven-Opening Divine Artifact."
Without hesitation, he merged the bridge into his body—into the Hongmeng Heavenly Emperor Tower.
RUMBLE!!
The Yin-Yang Bridge appeared in a sea of primal chaos within the tower. Black and white qi surged out, shattering the surrounding chaos. Fire, water, earth, and wind were born from the explosion. A sky and an earth formed.In an instant, a new space of over 2,000 kilometers in radius was created.
Though the Yin-Yang Bridge was nearly exhausted afterward, the space was solid and fully stabilized—fused into the Hongmeng Tower.
SHUA!!
As the space formed, a new level was added to the tower.
The Thirty-Third Layer of the Hongmeng Heavenly Emperor Tower!
The newborn space hadn't yet broken past the "cave-heaven" level, but the other 32 small worlds within the tower began to nourish it, rapidly causing it to expand.
2,500 km… 3,000 km… 50,000 km!
The newly born world quickly reached the same size as the others.
With this breakthrough, the Yin-Yang Bridge began to evolve.
Yin-Yang Bridge — Advanced to Mystic Grade (玄阶)!
"The Yin-Yang Bridge—suppressing all laws, linking Yin and Yang. Beneath the bridge, no technique can invade."
Yi Tianxing was awed. Even if it couldn't yet bridge realms, its suppressive power alone was immense.
"The madam likely miscalculated," he muttered. "Normally, a Mystic-Grade bridge indeed couldn't break through the barriers of Yin and Yang. But she overlooked the power of the Hongmeng Tower."
One world's power might be insufficient. But two, three, or thirty-three?
The Hongmeng Heavenly Emperor Tower was beyond standard grading.
Still, he would not expose it unless absolutely necessary.
Moreover, the bridge lacked coordinate data. Even if he left the netherworld, he couldn't guarantee arrival within the Great Yi Dynasty. He'd need the coordinates to pinpoint the exact location—and that had to be handled after returning.
Connecting Yin and Yang was far more complex than it seemed.