Many years ago, Ling Zichen had already brought metal research to the extreme. As the founder of the Single Positive Cycle Source Core, no one understands it better than she does.
She discovered that every type of metal has its limits, which in turn means the Single Positive Cycle Source Core also has limits.
Metal can be strengthened through forging, such as when creating Battle Armor; metal can be elevated to Spirit Forging, Soul Forging, or even God Rank levels. However, metals that have been enhanced, especially those that have undergone fusion and forging, become impossible to refine again into a Single Positive Cycle Source Core. Hence, in the manufacturing of the Single Positive Cycle Source Core, more importance is placed on the quality of the metal itself. Solving this problem is a significant research topic for the Douluo Federation in energy research.
