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Japanese Name 虹の原石
Equipment Type Key Item
Description A mysterious stone said to have healing powers.
Won From Lost Sanctum

The Prismastone (虹の原石 niji no genseki?, Rainbow Ore) is a Key Item exclusive to Chrono Trigger (DS). One of the Reptites in the prehistoric village of the Lost Sanctum asks the party to retrieve it from Mount Emerald to heal her sick daughter. The party is given a Capsule Set (2 Strength, 2 Speed, and 2 Magic capsules) in return. Once it is set in the altar of the Lost Sanctum village during prehistoric times, retrieved in the Middle Ages, and brought back to Prehistory so that there's two of them, they will fuse together to form the Saintstone.