Wellsprings of magical power
Dweomerstones are crystals of varying shapes, sizes and shades that can be tapped for enormous amounts of magical power. Their creation is commonly attributed to events in the scale of the personal, physical intervention by a god, and their qualities tends to reflect the force that birthed them. Dweomerstones are usually not of a man-portable size, but there are tales of exceptions.
Meddle with a dweomerstone at your own peril.