Ioun stones, originally called Congenio's pebbles, were magical items often manufactured by spellcasters.
When functioning, ioun stones floated in a circular pattern around their bearer's head, and granted various benefits based on their color. Two stones of the same type would repel each other. When drained of power, a stone became a dull grey, but still possessed the characteristic floating power.
- ↑ 1.0 1.1 slade, Jim Butler (Nov 1996). Netheril: Empire of Magic. (Wizards of the Coast). ISBN 0-7869-0437-2.
- ↑ Matthew P. Hargenrader (October 1991). “Bazaar of the Bizarre: Ioun stones: Where do you go if you want some more?”. In Roger E. Moore ed. Dragon #174 (TSR, Inc.), pp. 90–94.
- ↑ Brian R. James and Ed Greenwood (September, 2007). The Grand History of the Realms. (Wizards of the Coast), p. 28. ISBN 978-0-7869-4731-7.