A wave of darkness had appeared in the sky above the entire Cathayan Underworld, going east one moment, then traveling west the next. It was like a tug-of-war using a cast piece of black fabric, and if one could rise beyond the underworld and look down from there, they would find that the entirety of the Cathayan Underworld was enshrouded in inky darkness.

However, the darkness wasn't still and dead. Instead, it was moving like the tide, and it was formed by countless Yin clouds. Such was the force with which each side was tugging on the Yin energy that a crack had begun to appear at the center of the vast expanse of darkness.

The light of the sky filtered down through the rift, forming a radiant river of light, only to be quickly shut out again by the Yin clouds on either side of it. It was as if the entire body of darkness in the sky were a living creature.

Light and darkness interchanged irregularly, while Yin energy clashed, and it was as if two vast projections could be seen on either side, both of which were fighting over the Yin energy of the entire Cathayan Underworld.

Inside a certain city, an underworld emissary raised his head, and the Yin spirits standing in front of him, who were awaiting his instructions, were rather perplexed to see this.

The underworld emissary cast his gaze outside with a stunned expression, and soon, his colleagues realized that he was acting rather strange....