Within the Immortal Grotto-Heaven.
A silver-white sphere resembling a skull floated silently in midair.
Looking at the World-Casting Furnace that had fallen silent before him, a faint smile appeared on Zhang Yu's lips.
"Finally, it's done."
Gazing at the first Refining Emptiness Power Corpse Piece he had subdued, Zhang Yu reached out with one hand and violently extracted the Grotto-Heaven Power within it.
Now that it had fallen silent, the World-Casting Furnace naturally had no power to resist Zhang Yu's extraction. Surging Grotto-Heaven Power instantly flooded into Zhang Yu's body, causing the entire Immortal Grotto-Heaven to tremble faintly once more.
With each gentle tremor, the Immortal Grotto-Heaven seemed to grow again. The entire space abruptly expanded, its length, width, and height gradually surpassing eleven kilometers.
Feeling the Immortal Grotto-Heaven's growth once again, Zhang Yu nodded in satisfaction. "Subduing this Refining Void Corpse Piece really yields far more Grotto-Heaven Power than subduing ten Deity Transformation Corpse Pieces."
At the same time, Zhang Yu sensed a subtle, wondrous connection between himself and the World-Casting Furnace before him. The furnace was no longer mad with frenzy, but completely obeyed his commands.
"Then... start up."
"Ignite."
At that moment, tiny sparks rose within the World-Casting Furnace's core.
At the same time, all the magical power in the Immortal Grotto-Heaven flowed along one Magical Power Circuit after another, pouring into the World-Casting Furnace.
Even Zhang Yu himself suddenly thrust out his palm, channeling his own magical power into it.
Once the World-Casting Furnace was operating normally, its magical power refining efficiency would be extraordinarily high—enough to power every piece of equipment in the Immortal Grotto-Heaven, with power to spare.
But starting it up and igniting it also consumed an enormous amount of magical power.
As waves of magical power surged into it, threads of flame