The array that slipped from his fingertips and flew out like two interlocking circles, blazing golden, one side was the abstract lunar phase of the Numelin Elves intersecting, resembling a cracked dark smile; the other side was the Sun revered by Xinsas, radiating bristles.
This is the oldest meaning of alchemy, balance—the principle that everything in the world does not depart from it, the laws of matter and energy flow always adhere to this law—where there is increase, there is decrease. Thus, transmutation became the mainstream of alchemy, continuing from the Numelin Era to this day, using magic power to exchange for elements, and elements to exchange for magic power.
In Eteliria, elements are matter, and crystals are the medium.
The basic principle of equivalent exchange arises from this.
