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Actually, besides being used in pill concoction, demon cores can also be utilized for refining magic arrays.
The magic arrays crafted this way, when embedded in magical treasures, can produce a variety of marvelous effects.
For example, they can increase attack power, reduce the consumption of True Essence, come with certain special skills, or enhance certain types of damage, and so on.
Magical treasures of the same level, with or without embedded Array Refining Stones, the difference in efficacy is like heaven and earth.
Take Ling Xiao's several swords, for instance, they are embedded with Array Refining Stones, which is why they come with special skills and also have special amplifying effects.
Otherwise, they could only increase damage.
The reason Ling Xiao chose to learn the Method of Array Refinement was also due to this aspect.
Because demon cores have all sorts of special uses, they are absolutely hot commodities in the market.
