A mysterious stone said to have healing powers.
A Reptite needs the Prismastone in the Lost Sanctum. Find it on top of Mount Emerald, then deliver it for two Power Tabs, Magic Tabs, and Speed Tabs. Combine two to make the Saintstone. According to Reptite beliefs, only one Prismastone exists in the world.
The ritual of fusing two Prismastones together carries similarities to the fusion of two Dragon Tears to make the Chrono Cross.
Thanks to Vehek