D20:Ioun Stone Wondrous Item

Ioun Stones: These crystalline stones always float in the air and must be within 3 feet of their owner to be of any use. When a character first acquires a stone, she must hold it and then release it, whereupon it takes up a circling orbit 1d3 feet from her head. Thereafter, a stone must be grasped or netted to separate it from its owner. The owner may voluntarily seize and stow a stone (to keep it safe while she is sleeping, for example), but she loses the benefits of the stone during that time. Ioun stones have AC 24, 10 hit points, and hardness 5.

Color	Shape	Effect	Market Price
Clear	Spindle	Sustains creature without food or water	4,000 gp
Dusty rose	Prism	+1 insight bonus to AC	5,000 gp
Deep red	Sphere	+2 enhancement bonus to Dexterity	8,000 gp
Incandescent blue	Sphere	+2 enhancement bonus to Wisdom	8,000 gp
Pale blue	Rhomboid	+2 enhancement bonus to Strength	8,000 gp
Pink	Rhomboid	+2 enhancement bonus to Constitution	8,000 gp
Pink and green	Sphere	+2 enhancement bonus to Charisma	8,000 gp
Scarlet and blue	Sphere	+2 enhancement bonus to Intelligence	8,000 gp
Dark blue	Rhomboid	Alertness (as the feat)	10,000 gp
Vibrant purple	Prism	Stores three levels of spells, as a ring of spell storing	36,000 gp
Iridescent	Spindle	Sustains creature without air	18,000 gp
Pale lavender	Ellipsoid	Absorbs spells of 4th level or lower1	20,000 gp
Pearly white	Spindle	Regenerate 1 point of damage per hour	20,000 gp
Pale green	Prism	+1 competence bonus on attack rolls, saves, skill checks, and ability checks	30,000 gp
Orange	Prism	+1 caster level	30,000 gp
Lavender and green	Ellipsoid	Absorbs spells of 8th level or lower2	40,000 gp
1 After absorbing twenty spell levels, the stone burns out and turns to dull gray, forever useless.
2 After absorbing fifty spell levels, the stone burns out and turns dull gray, forever useless.

Regeneration from the pearly white ioun stone works like a ring of regeneration. (It only cures damage taken while the character is using the stone.) The pale lavender and lavender and green stones work like a rod of absorption, but absorbing a spell requires a readied action, and these stones cannot be used to empower spells. Stored spells in the vibrant purple stone must be placed by a spellcaster but can be used by anyone (see ring of minor spell storing).
Moderate varied; CL 12th; Craft Wondrous Item, creator must be 12th level.

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System Reference Document -> Magic Items: Wondrous Items