Ioun

Ioun Stones

Lore

Ioun - Ioun stones can grant an additional (maximum?) level, which makes these visible artifacts a source of conflict. They are simply referred to as "Ioun".

From Wikipedia

Ioun stones (pronounced EYE-oon[25]) are based on similar artifacts from Jack Vance's Dying Earth series.[26] When functioning, they float in a circular pattern around their bearer's head, and grant various benefits based on their color and shape 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. While useless to a mage, burned out stones can still yield a single psionic power point to a psionic character in 3rd and 3.5 editions. In the original Jack Vance stories Ioun stones are highly prized by arch-magicians, and are acquired from a race known as the archveults, who mine them from remnants of dead stars (in his book Rhialto the Marvellous). In 2E Dungeons & Dragons it had been conjectured in Dragon magazine that Ioun stones instead come from the Positive Material Plane. Dragon #174 featured an article that included many dozens of new types of ioun stone,[27] as well as an article about an elemental lord who hoards ioun stones on his home plane of radiance.[28] Under 3.0/3.5 editions of the rules they are instead manufactured by spellcasters in the same manner as other magical items.