A Sacred Stone is a rock from an important place, thought to be charged with earth power. A Stone has a store of 8 to 25 energy, which are spent automatically whenever the bearer fails an important roll (1 energy raises the roll by 1 point), as long as the Stone has enough energy to turn the failure into a success. The character has no way of knowing how much energy the stone contains, but when the energy runs out the Stone will turn white and then crumble away.
Only a Stonetalker can identify such a stone. They must be in a place charged with earth power and succeed in an identification roll resisted by a 25 (see Stonetalker rules).