Ioun stones are magical items often manufactured by spellcasters.
Description
When functioning, ioun stones float in a circular pattern around their bearer's head, and grant various benefits based on their color. Two stones of the same type will repel each other. and when drained of power, a stone becomes a dull grey, but still possesses the characteristic floating.
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References
- Hargenrader, Matthew P. Bazaar of the Bizarre & The Dragon's Bestiary. Dragon #174.TSR. (1991)