The old man nodded, tapping his fingers lightly on his knee a few times, producing a soft sound.

His voice carried a weariness, as if he had been carrying a heavy burden for many years: “That crack… existed ten thousand years ago.”

It appeared at the junction of the seventh and eighth layers of the Netherworld Abyss, as if it had been torn apart out of thin air.

At first, the crack was very small, only the width of a finger, but it would widen a little every now and then.

“And then what?”

“Later we discovered that if a living person wasn’t periodically sent into the crack… the crack would begin to stir up the Yin energy of the Netherworld Abyss.”

The yin energy surged and surged violently, causing the entire Netherworld Abyss to tremble violently.