- The Magic Stone is a magic stone of Amber.
Background[]
The stone can be used to teleport into and out of trouble. Bob Jack learned the hard way about this spell. One of the more useful purposes is that it will help someone escape the sea back onto the boat if far out at sea. The teleportation spell attached to it only works in the region where the caster is currently at. So it can help them escape stuff like Abominable snowman, and possibly the desert. But it won't poof someone back to Llewdor from Daventry.
Behind the scenes[]
The automated hint line called this the “oracle stone”.