This spell hastens the slow-moving spirits of the earth to provide information about an underground area.
When chanted successfully, secrets of stone allows the cantor(s) to learn who or what has recently passed through a tunnel, pass, or mountain range. Since stone has no concept of time, it cannot relate how recently the creatures have passed, but it can provide complete descriptions and numbers. In areas where the spirits have encountered dwarves before, they pass along their information by covering a nearby wall or stone with dwarven runes describing recent activities. In areas where the spirits have never met dwarves, they form pictures instead of runes.
The spell's duration is a single day, or until the bound spirits answer three questions, whichever comes first. The material component for secrets of stone is a geode, a type of hollow stone filled with a crystalline lining.