772. Gathering Spirits

Several days later, the massive Energy-Gathering Array, covering nearly a hundred square kilometers, was completed. It alone used six thousand top-grade Krypton Crystals, and another six thousand top-grade Krypton Crystals would be consumed every ten days.

In addition, a Perfect-grade Krypton Crystal served as the core of the massive Energy-Gathering Array. Naturally, the Perfect-grade Krypton Crystal did not need frequent replacement; it only needed to be swapped out every ten years, when its energy ran low, for one fully charged with energy.

The removed Perfect-grade Krypton Crystal, once low on energy, could be returned to a Krypton Crystal Mine to slowly replenish its energy.

Fortunately, that was the case. Otherwise, no one would likely dare to set up such a massive array, because Perfect-grade Krypton Crystals were so precious and rare that wealth alone could not buy them.

Even David, wealthy as he was, could not help marveling at the consumption of the massive Energy-Gathering Array. No wonder only top-tier nobles dared to build one. It was not merely a matter of environment—without sufficient wealth, the consumption of top-grade Krypton Crystals alone would bankrupt an ordinary noble.

David had quite a number of top-grade Krypton Crystals on hand, but he could only sustain this for five months at most.

However, five months would be enough for David to raise his strength by a substantial margin. He did not concern himself with the issue of top-grade Krypton Crystals. After five months, the Krypton Crystal Mine in the Black Rock Mining Area would be able to continuously supply him with some top-grade Krypton Crystals.

Together with the top-grade Krypton Crystals he could exchange for with his ducal title, it would probably be enough to cover his consumption.

Looking at the massive Energy-Gathering Array, David planned to build a castle here. The castle's