Third level of the Biometal Herculean Technique

Klaus waved his hand, and from his space ring, a small crystal glowing with a sky-blue energy appeared.

Cain's eyes immediately narrowed as he saw that crystal. Within it, he felt an extremely pure energy and sensed how his Astral Wave instinctively reacted to it.

"Its name is Goldsoul Crystal, a family treasure. Its power radiates from its ability to set your Astral Wave ablaze, burning the impurities within it, while simultaneously reinforcing it and improving its quantity and quality."

Klaus gave Cain a moment to analyze the crystal before continuing.

"You can only use one during each Cultivation Rank. This one is more than enough for a Wave Champion like you. Normally, people wait until they have reached the peak of the rank to use them, but I gather that you intend to use it right away and hope to acquire something even better by the time you approach Wave King status."