Elfstones are powerful magical artifacts, usually found in groups of three, to symbolize the user's body, mind, and spirit. There were many of them during the time of Faerie. Most of the Elfstones were lost after the Faerie creatures were gone. Each color of Elfstone had a property that made it unique. The user must be an Elf for Elfstones to work, and use by someone who is part Elf can have mixed results, as shown when Wil Ohmsford, who was one eighth Elvish, used the Blue Elfstones, resulting in his descendants inheriting part of the Elfstones' magic in the form of the wishsong.
Elfstones was found by the Troll of Faerie, and the Elves transformed it in magical artifacts. Most important of these was the Loden and the Black Elfstone.