Wondrous Wednesday: IOUN Stones (D&D5E)

One of the magic items in D&D most associated with the high-level game is the IOUN stone. Invented by Jack Vance in his Dying Earth stories, the origin of these items is detailed in "Morreion," collected in Flashing Swords #1 (Dell, 1973). The magicians of Earth covet these items immensely. They are obtained from the hearts of stars that "bounce off" an impenetrable barrier at the edge of the Universe called "NOTHING." If the orbit for a star pulls it back from the edge, industrious creatures can get IOUN stones from pockets of dust revealed in the hearts of the stars. The titular character in "Morreion" is followed by a virtual cloud of such stones, which are shown in the story to absorb magic spells and (apparently) store his memories.

The D&D implementation was a little different. E. Gary Gygax got permission from Jack Vance to include them in issue #4 of The Strategic Review (1975) in an article entitled "Mighty Magic Miscellany." Other origins have been suggested for use in D&D, including:

• In "Bazaar of the Bizarre" in Dragon #174 (October 1991), Matthew P. Hargenrader postulates that they come from the Quasi-Elemental Plane of Mineral, where they apparently arise due to enormous magical pressures exerted by the Positive Plane and the Elemental Plane of Earth. An associated article provided monster statistics for creatures relevant to hunting stones on the plane of Mineral. (AD&D 1E)
• In Netheril: Empire of Magic, the stones are said to be the invention of the wizard Congenio Ioun, who originally called them Congenio's pebbles. Congenio was an inventor and is assumed to have created other items that have been lost to time. I have opted not to include them in my list -- it is too long as it is. (AD&D 2E)
• In the 3rd edition, IOUN stones became just like any other magic item -- craftable by wizards and others with the proper training and resources.
• In "The Sages of the Swan Tower" in Dragon #397 (March 2011), the stones are said to be the creations of the goddess Ioun. The greatest of the sages who serve in her Swan Tower in the celestial city of Hestavar are honored with magical monuments called he Pillars of Ioun. Each pillar resonates with the quality of that particular sage, and this power is drawn upon by a specific type of IOUN stone. (D&D 4E)
• In Pathfinder, the stones can still be crafted by wizards, but the ancient civilization of Azlant developed and perfected the magical technology, lending the stones cachet as an "ancient mystery." The Pathfinder Society in the Golarion setting makes extensive use of ioun stones, housing them in devices called wayfinders that can amplify or modify their effects.

I think in the long run, the Dying Earth RPG implementation is the most flavorful. In that game, IOUN stones have two effects:

• They can absorb magic.
• They can store ephemeral mental phenomena: memories, personality traits, whatever.

In D&D 5E terms, I'd make them like this:

IOUN Stones

Wondrous item, very rare (requires attunement)

You can have any number of IOUN stones attuned at once; all the IOUN stones you have attuned take up one attunement slot. You can use a reaction to cancel a spell or magical effect caused by a creature you can see and targeting only you. This causes a number of stones to "burn out" equal to the level of the spell or effect.

Alternatively, you may "store" a Personality Trait, Flaw, or memory in the stones. This uses a number of stones equal to your Intelligence. Stones that are being used this way may not be used to cancel magic. This grants you advantage on related checks. For example, a caster might store every personality trait except for Obsession in his IOUN stones, in order to focus on spell research. The DM gives the character advantage on all rolls related to spell research, but disadvantage to any rolls related to any other responsibility. You can reclaim any stored traits using a bonus action, at which point the stones used "burn out."

"Burned out" stones may not be used for any purpose for three days, at which point they are refreshed.

Since I've already compiled a lot of information about the stones from published sources, I might as well put it up here. I've deliberately avoided other fan lists (such as Quann'Ra-Tioll Moorclyne's Most Excellent Compilation), as just going by published sources was already a Herculean task.

agate ellipsoid: bestows augury, as the spell (PFS Primer (2013, PF1E, 1,000gp))

amber octahedron: grants endurance; "of Fortitude" (101 Ioun Stones (2020, 5E, Very Rare))

amber sphere: holy symbol; enhances perception & insight; "of Divine Knowledge" (Adventurer's Vault 2 (2009, 4E, 625,000gp))

amber spiked stone: increases one ability; "of Advancement" (101 Ioun Stones (2020, 5E, Very Rare))

amber spindle: improves saving throws (PFSSoS (2009, PF1E, 10,000gp))

amethyst ovoid: immune to psychic blast, imbues with Cell Repair psychic power (True Dungeon Token Guide Compendium (2016))

amethyst pyramid: hides from undead creatures (PFS Primer (2013, PF1E, 8,000gp))

amethyst sphere: improves Wisdom saving throw; "of Self-Knowledge" (101 Ioun Stones (2020, 5E, Rare))

angular amethyst stone: enhances innate ability, bugbear only; "Grankhul's Insight" (101 Ioun Stones (2020, 5E, Uncommon))

aqua cube: protects against grapple attacks; "of Slipperiness" (101 Ioun Stones (2020, 5E, Uncommon))

aquamarine ellipsoid: grants creature swim speed, water genasi only; "of Seafoam" (101 Ioun Stones (2020, 5E, Common))

beryl prism: +1 to saving throws (True Dungeon Token Guide Compendium (2016))

black bead: enhances stealth abilities; "of Shadow" (101 Ioun Stones (2020, 5E, Rare))

black cube: improves spellcasting (enchantment spells) (The Primer of Practical Magic (2004, 3.5E, 10,000gp))

black decagon: turns gems into magical energy; "of Conversion" (101 Ioun Stones (2020, 5E, Legendary))

black dodecahedron: bestows negative energy protection, as the spell (The Primer of Practical Magic (2004, 3.5E, 10,000gp))

black pearl: negates opponents' magical bonuses (mostly) versus owner (True Dungeon Token Guide Compendium (2016))

black prism: stores cantrip (True Arcane Story: Ioun Stones (2007, 3.0E, 6,000gp))

black rhomboid: cloaks in illusion; "of Displacement" (101 Ioun Stones (2020, 5E, Very Rare))

black sphere: grants magic resistance against necromancy (Legends & Lairs: Spells and Spellcraft (2002, 3.0E, 40,000gp))

black spindle: touch drains energy like a vampire (True Arcane Story: Ioun Stones (2007, 3.0E, 75,000gp))

black spindle: grants darkvision, see through mist, fog, & smoke (Kobold Quarterly #06 "Rolling Stones" (2008, PF1E, 29,000gp); Deep Magic (2014, PF1E, 29,000gp))

black star: absorbs electrical damage (Dragon Annual #2 "Dragonwyr" (1997, 2E))

black torus: preserves when unconscious; "of Undeath" (101 Ioun Stones (2020, 5E, Rare))

black torus: grants invisibility when immobile; "of Stillness" (101 Ioun Stones (2020, 5E, Very Rare))

black & white ellipsoid: protects against scrying (Dragon #319 "I Scry: Spying and Divination Items" (2004, 3.0E, 60,000gp))

black & white faceted crystal: improves defense (Wisdom); "of Circumspection" (101 Ioun Stones (2020, 5E, Rare))

black and green cube: improves spellcasting (necromancy spells) (The Primer of Practical Magic (2004, 3.5E, 8,000gp))

black and red cube: improves spellcasting (transmutation spells) (The Primer of Practical Magic (2004, 3.5E, 20,000gp))

black obsidian bead: damage a creature that damages you (acid); "of Toxicity" (101 Ioun Stones (2020, 5E, Rare))

black obsidian droplet: sustains w/o sleep; "of Vigilance" (101 Ioun Stones (2020, 5E, Rare))

black w/ white stripes spindle: grants immunity to death magic and negative energy (True Arcane Story: Ioun Stones (2007, 3.0E, 56,000gp))

blazing orange prism: improves spellcasting (increase penetration) (Boundless Magic III: Ioun Stones (2019, PF1, 10,000gp))

blood red trapezoid: grants natural attacks; "of Primal" (101 Ioun Stones (2020, 5E, Uncommon))

blue cone: bestows detect poison, as the spell (The Primer of Practical Magic (2004, 3.5E, 1,000gp))

blue cone: sense emotions (willing); "of Empathy" (101 Ioun Stones (2020, 5E, Rare))

blue dodecahedron: bestows protection from arrows, as the spell (The Primer of Practical Magic (2004, 3.5E, 4,000gp))

blue ellipsoid: grants swim speed; "of Aquatics" (101 Ioun Stones (2020, 5E, Rare))

blue flawed prism: shoots blue ray of petrification, then burns out & turns gray (True Arcane Story: Ioun Stones (2007, 3.0E, 4,550gp))

blue gem: increases Charisma; "of Allure" (Neverwinter MMORPG)

blue pyramid: improves spellcasting (increase penetration) (The Primer of Practical Magic (2004, 3.5E, 15,000gp))

blue spindle: protects against time magic; "of Presence" (101 Ioun Stones (2020, 5E, Very Rare))

blue star: bestows disguise self, as the spell; "Western Star Ioun Stone" (Occult Mysteries (2014, PF1E, 4,000gp))

blue-green spindle: bestows airy water, as the spell (Dragon issue #174 "Bazaar of the Bizarre: Ioun Stones" (1991, 2E); Encyclopedia Magica Volume 2 (1995, 2E))

blue-steel sphere: provides extra martial resources (Boundless Magic III: Ioun Stones (2019, PF1, 10,000gp))

brass lozenge: buffs or heals hit points on command, once per day (Dragon issue #174 "Bazaar of the Bizarre: Ioun Stones" (1991, 2E); Encyclopedia Magica Volume 2 (1995, 2E))

brass-colored ellipsoid: grants creature fire resistance, fire genasi only; "of Brass" (101 Ioun Stones (2020, 5E, Uncommon))

bright blue rhomboid: grants flight (Cloud Warriors (2003, 3.0E, 8,000gp))

bright silver cylinder: user can go ethereal for one hour (Dragon issue #174 "Bazaar of the Bizarre: Ioun Stones" (1991, 2E); Encyclopedia Magica Volume 2 (1995, 2E); Lords of Darkness (2001, 3.0E))

bright white disk: bestows shield, as the spell thrice/day (Boundless Magic III: Ioun Stones (2019, PF1, 24,000gp))

bright white rectangle: protects against acid-based attacks (Dragon issue #174 "Bazaar of the Bizarre: Ioun Stones" (1991, 2E); Encyclopedia Magica Volume 2 (1995, 2E))

bright yellow spindle: grants superior darkvision (Legends & Lairs: Spells and Spellcraft (2002, 3.0E, 8,000gp))

brilliant blue disk: bestows Eschew Materials, as the feat (Boundless Magic III: Ioun Stones (2019, PF1, 10,000gp))

brilliant blue rhomboid: adds to defense (True Arcane Story: Ioun Stones (2007, 3.0E, 15,000gp))

brilliant green rhomboid: adds to defense (luck) (True Arcane Story: Ioun Stones (2007, 3.0E, 30,000gp))

brilliant purple sphere: grants immunity against poison (True Arcane Story: Ioun Stones (2007, 3.0E, 27,000gp))

brilliant red prism: adds to defense (predictive) (True Arcane Story: Ioun Stones (2007, 3.0E, 15,000gp))

brilliant scarlet sphere: enhances innate ability, hobgoblin only; "Eye of Maglubiyet" (101 Ioun Stones (2020, 5E, Common))

brilliant white ellipsoid: enhances innate ability, aasimar only; "of Grace" (101 Ioun Stones (2020, 5E, Uncommon))

brilliant white prism: stores 9th-level spell (True Arcane Story: Ioun Stones (2007, 3.0E, 108,000gp))

brown heart-shaped: bestows Toughness, as the feat (True Arcane Story: Ioun Stones (2007, 3.0E, 10,000gp))

brown rhomboid: user can assume gaseous form for one hour (Dragon issue #174 "Bazaar of the Bizarre: Ioun Stones" (1991, 2E); Encyclopedia Magica Volume 2 (1995, 2E))

brown sphere: indicates true north (Kobold Quarterly #06 "Rolling Stones" (2008, PF1E, 2,000gp); Deep Magic (2014, PF1E, 2,000gp))

brown thorny sphere: protects against trip attacks (Inner Sea Combat (2014 PF1E, 8,000gp))

burnished brassy stone: enhances natural abilities; "of Natural Knowledge" (Lost Laboratory of Kwalish (2018, 5E, Rare))

cerulean blue rhomboid: bestows free action, as the spell (Dragon issue #174 "Bazaar of the Bizarre: Ioun Stones" (1991, 2E); Encyclopedia Magica Volume 2 (1995, 2E); Lords of Darkness (2001, 3.0E))

clear crystal: sustains w/o food & water, protects against adverse environments; "of Adaptation" (Manual of the Planes (2008, 4E, 225,000gp))

clear cylinder: improves spellcasting (increase area of effect) (The Primer of Practical Magic (2004, 3.5E, 12,000gp))

clear ellipsoid: sustains w/o food, water, & air (True Arcane Story: Ioun Stones (2007, 3.0E, 30,000gp))

clear eye: grants 360º vision; "Ioun Eye" (Dragon issue #267 "Bazaar of the Bizarre: The Eyes Have It" (2000, 2E))

clear octahedron: bestows air walk, as the spell (The Primer of Practical Magic (2004, 3.5E, 4,000gp))

clear orb: stores water; "of Quenching" (101 Ioun Stones (2020, 5E, Uncommon))

clear prism: stores spells (The Strategic Review, Vol. 1 Issue 4; Encyclopedia Magica Volume 2 (1995, 2E))

clear prism: grants low-light vision; improves perception skills (A Baker's Dozen of Ioun Stones (2016, PF1E, 48,000gp))

clear scalahedron: bestows polymorph self, as the spell (The Primer of Practical Magic (2004, 3.5E, 15,000gp))

clear sphere: grants magic resistance (Dragon issue #174 "Bazaar of the Bizarre: Ioun Stones" (1991, 2E); Encyclopedia Magica Volume 2 (1995, 2E))

clear spindle: sustains w/o food & water; "of Sustenance" (DMG (1979, 1E); DMG Revised (1992, 2E); DMG (2000, 3.0E, 5,000gp); DMG (2003, 3.5E, 4,000gp); PFCRB (2009, PF1E, 8,000gp); PFSSoS (2009, PF1E, 4,000gp); DMG (2014, 5E, Rare))

clear spindle: flawed; user not nourished by food/drink; protects against disease/poison (Kobold Quarterly #06 "Rolling Stones" (2008, PF1E, 1,260gp); Deep Magic (2014, PF1E, 1,260gp))

clear teardrop: bestows detect undead, as the spell (Ghostwalk CampaignSetting (2003, 3.0E, 4,000gp))

clear green sphere: grants magic resistance against transmutation (Legends & Lairs: Spells and Spellcraft (2002, 3.0E, 40,000gp))

clear pink sphere: stores user's soul on death (Dragon issue #174 "Bazaar of the Bizarre: Ioun Stones" (1991, 2E); Encyclopedia Magica Volume 2 (1995, 2E))

clear quartz ellipsoid: protects ioun stones (phasing/invisibility) (Boundless Magic III: Ioun Stones (2019, PF1, 10,000gp))

clear red sphere: grants magic resistance against evocation (Legends & Lairs: Spells and Spellcraft (2002, 3.0E, 40,000gp))

clear yellow rhomboid: grants magic resistance against enchantment (Legends & Lairs: Spells and Spellcraft (2002, 3.0E, 40,000gp))

clear-blue cylinder: improves spellcasting (cast spells at maximum effect) (The Primer of Practical Magic (2004, 3.5E, 15,000gp))

clear-green cylinder: improves spellcasting (cast spells at higher level) (The Primer of Practical Magic (2004, 3.5E, 12,000gp))

clear-rose cylinder: improves spellcasting (cast spells more powerfully) (The Primer of Practical Magic (2004, 3.5E, 12,000gp))

clear-yellow dipyramid: bestows zone of truth, as the spell (The Primer of Practical Magic (2004, 3.5E, 6,000gp))

clockwork mechanical cube: transforms into machine; "of Automaton" (101 Ioun Stones (2020, 5E, Very Rare))

cloud-white stone: improves walking speed, increases flight, aarakocra only; "Wind Duke's Current" (101 Ioun Stones (2020, 5E, Uncommon))

cloudy green disk: grants low-light vision; improves arcane skills (Boundless Magic III: Ioun Stones (2019, PF1, 17,000gp))

copper cube: protects against lightning damage (True Dungeon Token Guide Compendium (2016))

copper rectangle: grants fluency with magic writing (Dragon issue #174 "Bazaar of the Bizarre: Ioun Stones" (1991, 2E); Encyclopedia Magica Volume 2 (1995, 2E))

coral cube: can activate magic in scrolls and wands without saying command word; underwater only (True Dungeon Token Guide Compendium (2016))

coral sphere: can use scrolls underwater; underwater only (True Dungeon Token Guide Compendium (2016))

crackling red sphere: bestows flaming on melee attacks (Boundless Magic III: Ioun Stones (2019, PF1, 40,000gp))

crimson sphere: increases Intelligence (PFSSoS (2009, PF1E, 24,000gp))

crimson thorny sphere: protects against bull rush attacks (Inner Sea Combat (2014 PF1E, 8,000gp))

dark blue ellipsoid: absorbs magic missiles (Dragon Annual #2 "Dragonwyr" (1997, 2E))

dark blue rhomboid: bestows Alertness, as feat (DMG (2000, 3.0E, 10,000gp); DMG (2003, 3.5E, 10,000gp); Lords of Darkness (2001, 3.0E); PFCRB (2009, PF1E, 10,000gp); PFSSoS (2009, PF1E, 10,000gp))

dark blue rhomboid: grants darkvision, enhances insight & perception, see invisible creatures; "of True Sight" (Player's Handbook (2008, 4E, 2,125,000gp))

dark blue rhomboid: protects against surprise; "of Awareness" (DMG (2014, 5E, Rare))

dark blue rhomboid: prevents tracks; "of Obscurity" (101 Ioun Stones (2020, 5E, Rare))

dark blue shard: reduces consumption of black ice; "Black Ice Ioun Stone" (Neverwinter MMORPG)

dark brown nodule: increases critical chance; "Black Dragon Ioun Stone" (Neverwinter MMORPG)

dark gray gem: protects against location detection; "of Shroud" (101 Ioun Stones (2020, 5E, Rare))

dark green ellipsoid: enhances defense with luck (Lords of Darkness (2001, 3.0E))

dark green rhomboid: indicates any poisons w/in 5 feet (Dungeoneer's Handbook (2013, PF1E, 8,000gp))

dark orange dodecahedron: grants spell resistance (Lords of Darkness (2001, 3.0E))

dark purple pyramid: doubles 4th-level spells (Lords of Darkness (2001, 3.0E))

dark purple triangle: doubles 3rd-level spells (Lords of Darkness (2001, 3.0E))

dark red cube: bestows telepathic ability to read minds (Lords of Darkness (2001, 3.0E))

dark red rhomboid: improves initiative; "of Attentiveness" (101 Ioun Stones (2020, 5E, Uncommon))

deep black sphere: grants ability to see in magical darkness (Dragon issue #174 "Bazaar of the Bizarre: Ioun Stones" (1991, 2E); Encyclopedia Magica Volume 2 (1995, 2E))

deep green ellipsoid: improves ability to handle animals (Legends & Lairs: Spells and Spellcraft (2002, 3.0E, 10,000gp))

deep purple nodule: grants darkvision (Boundless Magic III: Ioun Stones (2019, PF1, 24,000gp))

deep purple prism: grants infravision (Dragon issue #174 "Bazaar of the Bizarre: Ioun Stones" (1991, 2E); Encyclopedia Magica Volume 2 (1995, 2E))

deep purple stone: bestows command, as the spell; "of Control" (101 Ioun Stones (2020, 5E, Very Rare))

deep red cube: improves spellcasting (evocation spells) (The Primer of Practical Magic (2004, 3.5E, 15,000gp))

deep red sphere: increases Strength (The Strategic Review, Vol. 1 Issue 4; Encyclopedia Magica Volume 2 (1995, 2E))

deep red sphere: increases Dexterity; "of Agility" (DMG (1979, 1E); DMG Revised (1992, 2E); DMG (2000, 3.0E, 8,000gp); Lords of Darkness (2001, 3.0E); DMG (2003, 3.5E, 8,000gp); PFCRB (2009, PF1E, 8,000gp); PFSSoS (2009, PF1E, 8,000gp); Mordenkainen's Magnificent Emporium (2011, 4E, 225,000gp); DMG (2014, 5E, Very Rare))

deep red & black ellipsoid: grants additional attacks of opportunity (Legends & Lairs: Spells and Spellcraft (2002, 3.0E, 8,000gp))

deep violet star: grants swim speed, ability to breathe underwater for 10 min/day; "Southern Star Ioun Stone" (Heroes From the Fringe (2018, PF1E, 8,000gp))

dull blue ellipsoid: absorbs cold damage (True Arcane Story: Ioun Stones (2007, 3.0E, 8,000gp))

dull blue rhomboid: absorbs cold damage (True Arcane Story: Ioun Stones (2007, 3.0E, 18,000gp))

dull blue sphere: absorbs cold damage (True Arcane Story: Ioun Stones (2007, 3.0E, 30,000gp))

dull gray any: burned out, "dead" stone (DMG (1979, 1E); DMG Revised (1992, 2E); DMG (2000, 3.0E, 25gp); PFSSoS (2009, PF1E, 25gp))

dull gray sphere: bestows alter self, as the spell; "of Mimicry" (101 Ioun Stones (2020, 5E, Very Rare))

dull green ellipsoid: absorbs acid damage (True Arcane Story: Ioun Stones (2007, 3.0E, 8,000gp))

dull green rhomboid: absorbs acid damage (True Arcane Story: Ioun Stones (2007, 3.0E, 18,000gp))

dull green sphere: absorbs acid damage (True Arcane Story: Ioun Stones (2007, 3.0E, 30,000gp))

dull orange ellipsoid: absorbs sonic damage (True Arcane Story: Ioun Stones (2007, 3.0E, 8,000gp))

dull orange rhomboid: absorbs magic missiles (Lords of Darkness (2001, 3.0E))

dull orange rhomboid: absorbs sonic damage (True Arcane Story: Ioun Stones (2007, 3.0E, 18,000gp))

dull orange sphere: absorbs sonic damage (True Arcane Story: Ioun Stones (2007, 3.0E, 30,000gp))

dull purple ellipsoid: absorbs force damage (True Arcane Story: Ioun Stones (2007, 3.0E, 8,000gp))

dull purple rhomboid: absorbs force damage (True Arcane Story: Ioun Stones (2007, 3.0E, 18,000gp))

dull purple sphere: absorbs force damage (True Arcane Story: Ioun Stones (2007, 3.0E, 30,000gp))

dull red ellipsoid: absorbs fire damage (True Arcane Story: Ioun Stones (2007, 3.0E, 8,000gp))

dull red rhomboid: absorbs fire damage (True Arcane Story: Ioun Stones (2007, 3.0E, 18,000gp))

dull red sphere: absorbs fire damage (True Arcane Story: Ioun Stones (2007, 3.0E, 30,000gp))

dull yellow ellipsoid: absorbs lightning damage (True Arcane Story: Ioun Stones (2007, 3.0E, 8,000gp))

dull yellow rhomboid: absorbs lightning damage (True Arcane Story: Ioun Stones (2007, 3.0E, 18,000gp))

dull yellow sphere: absorbs lightning damage (True Arcane Story: Ioun Stones (2007, 3.0E, 30,000gp))

dusty rose prism: adds to defense; "of Protection" (DMG (1979, 1E); DMG Revised (1992, 2E); DMG (2000, 3.0E, 4,000gp); Lords of Darkness (2001, 3.0E); DMG (2003, 3.5E, 5,000gp); PFCRB (2009, PF1E, 5,000gp); DMG (2014, 5E, Rare))

electric blue w/white flecks prism: protects against electrical-based attacks (A Baker's Dozen of Ioun Stones (2016, PF1E, 96,000gp))

emerald cube: negates hold effects, slow spell, and natural/magical hindrances (True Dungeon Token Guide Compendium (2016))

emerald ellipsoid: grants temporary hit points (PFSSoS (2009, PF1E, 20,000gp))

emerald prism: removes underwater hindrances from weapons; underwater only (True Dungeon Token Guide Compendium (2016))

emerald pyramid: protects against poison (True Dungeon Token Guide Compendium (2016))

emerald undulating droplet: enhances damage (poison); "of Venom" (101 Ioun Stoness (2020, 5E, Very Rare))

emerald green spindle: protects against ranged attacks (obscurement) (A Baker's Dozen of Ioun Stones (2016, PF1E, 96,000gp))

faceted amber: protects against missile or spell attacks (True Dungeon Token Guide Compendium (2016))

faceted sphere: enhances Intelligence abilities; "of Supreme Intellect" (Lost Laboratory of Kwalish (2018, 5E, Rare))

flaming red nodule: adds to defense; "Red Dragon Ioun Stone" (Neverwinter MMORPG)

flickering white snowflake: protects against cold-based attacks (Dragon issue #174 "Bazaar of the Bizarre: Ioun Stones" (1991, 2E); Encyclopedia Magica Volume 2 (1995, 2E))

forest green cube: improves spellcasting (abjuration spells) (The Primer of Practical Magic (2004, 3.5E, 10,000gp))

forest green scalahedron: bestows passwall, as the spell (The Primer of Practical Magic (2004, 3.5E, 6,000gp))

frosted blue spindle: bestows frost on melee attacks (Boundless Magic III: Ioun Stones (2019, PF1, 40,000gp))

gamboge nodule: protects against poison (PFSSoS (2009, PF1E, 54,000gp))

garnet cube: increases Constitution (True Dungeon Token Guide Compendium (2016))

garnet prism: protects against entanglement in webs (True Dungeon Token Guide Compendium (2016))

garnet sphere: increases Constitution (True Dungeon Token Guide Compendium (2016))

glass sphere: enhances tracking; "of Greater Bloodscent" (101 Ioun Stones (2020, 5E, Rare))

glassy black prism: stores 1st-level spell (True Arcane Story: Ioun Stones (2007, 3.0E, 12,000gp))

glistening ruby: improves checks; "of Passion" (101 Ioun Stones (2020, 5E, Rare))

glittering golden pyramid: grants fluency in 4 languages; improves interaction skills (Boundless Magic III: Ioun Stones (2019, PF1, 7,000gp))

glowing red stone: communicate telepathically w/ fiends, tiefling only; "of Infernal Kin" (101 Ioun Stones (2020, 5E, Rare))

glowing rose prism: adds to defense (Kobold Quarterly #06 "Rolling Stones" (2008, PF1E, 125,000gp); Deep Magic (2014, PF1E, 125,000gp))

glowing violet sphere: improves Intelligence savings throws, gith only; "of Psionic Focus" (101 Ioun Stones (2020, 5E, Rare))

glowing violet sphere: enhances innate ability, githyanki only; "of Psionic Focus" (101 Ioun Stones (2020, 5E, Rare))

glowing violet sphere: enhances innate ability, githzerai only; "of Psionic Focus" (101 Ioun Stones (2020, 5E, Rare))

glowing white diamond: restores ally; "of Restoration" (101 Ioun Stones (2020, 5E, Very Rare))

glowing yellow dodecahedron: grants light, as the cantrip; "of Luminosity" (101 Ioun Stones (2020, 5E, Uncommon))

gold ellipsoid: user can go astral for one hour (Dragon issue #174 "Bazaar of the Bizarre: Ioun Stones" (1991, 2E); Encyclopedia Magica Volume 2 (1995, 2E))

gold nodule: grants fluency with one language (PFS Primer (2013, PF1E, 5,000gp))

gold and silver orb: charms animals; "of Obedience" (101 Ioun Stones (2020, 5E, Very Rare))

golden ellipsoid: sentient; provides extra attacks (Kobold Quarterly #06 "Rolling Stones" (2008, PF1E, 32,000gp); Deep Magic (2014, PF1E, 32,000gp))

golden sphere: distracts viewers from user's disguise (Kobold Quarterly #06 "Rolling Stones" (2008, PF1E, 7,200gp); Deep Magic (2014, PF1E, 7,200gp))

gray ellipsoid: grants immobility; "of Anchor" (101 Ioun Stones (2020, 5E, Very Rare))

gray & pulsing sphere: protects ioun stones (invisibility) (True Arcane Story: Ioun Stones (2007, 3.0E, 6,000gp))

gray & sheeny sphere: bestows invisibility, as the spell (True Arcane Story: Ioun Stones (2007, 3.0E, 20,000gp))

gray and white-flecked cuboid: grants endurance; "of Sturdiness" (101 Ioun Stones (2020, 5E, Rare))

green flawed prism: shoots green ray of poison, then burns out & turns gray (True Arcane Story: Ioun Stones (2007, 3.0E, 4,550gp))

green sphere: protects against gas-based attacks (Dragon issue #174 "Bazaar of the Bizarre: Ioun Stones" (1991, 2E); Encyclopedia Magica Volume 2 (1995, 2E))

green & blue sphere: delays death; "of Vitality" (Infernal MachineRebuild (2019, 5E, Very Rare))

grey ellipsoid : burned out, "dead" stone (True Arcane Story: Ioun Stones (2007, 3.0E, 500gp))

grey heart-shaped: burned out, "dead" stone (True Arcane Story: Ioun Stones (2007, 3.0E, 500gp))

grey prism: burned out, "dead" stone (True Arcane Story: Ioun Stones (2007, 3.0E, 500gp))

grey rhomboid: burned out, "dead" stone (True Arcane Story: Ioun Stones (2007, 3.0E, 500gp))

grey sphere: burned out, "dead" stone (True Arcane Story: Ioun Stones (2007, 3.0E, 500gp))

grey spindle: burned out, "dead" stone (True Arcane Story: Ioun Stones (2007, 3.0E, 500gp))

incandescent blue cylinder: improves spellcasting (cast spells silently) (The Primer of Practical Magic (2004, 3.5E, 10,000gp))

incandescent blue sphere: improves spellcasting (overall) (The Strategic Review, Vol. 1 Issue 4; Encyclopedia Magica Volume 2 (1995, 2E))

incandescent blue sphere: increases Wisdom; "of Insight" (DMG (1979, 1E); DMG Revised (1992, 2E); DMG (2000, 3.0E, 8,000gp); Lords of Darkness (2001, 3.0E); DMG (2003, 3.5E, 8,000gp); PFCRB (2009, PF1E, 8,000gp); PFSSoS (2009, PF1E, 8,000gp); DMG (2014, 5E, Very Rare))

incandescent blue sphere: bestows fly, as the spell (Legends & Lairs: Spells and Spellcraft (2002, 3.0E, 10,000gp))

incandescent purple dipyramid: bestows see invisibility, as the spell (The Primer of Practical Magic (2004, 3.5E, 3,000gp))

incandescent red cone: bestows detect secret doors, as the spell (The Primer of Practical Magic (2004, 3.5E, 1,000gp))

indigo flawed prism: shoots blue ray of insanity, then burns out & turns gray (True Arcane Story: Ioun Stones (2007, 3.0E, 4,550gp))

iridescent sphere: protects against toxic gases (True Dungeon Token Guide Compendium (2016))

iridescent spindle: sustains w/o air (DMG (1979, 1E); DMG Revised (1992, 2E); DMG (2000, 3.0E, 18,000gp); DMG (2000, 3.5E, 18,000gp); PFCRB (2009, PF1E, 18,000gp); PFSSoS (2009, PF1E, 18,000gp); True Dungeon Token Guide Compendium (2016))

iridescent spindle: sustains w/o food, water, or air, user needs half as much rest; "of Sustenance" (Adventurer's Vault (2008, 4E, 225,000gp); Mordenkainen's Magnificent Emporium (2011, 4E, 225,000gp))

iridescent blue cone: bestows detect scrying, as the spell (The Primer of Practical Magic (2004, 3.5E, 2,500gp))

iridescent blue dodecahedron: bestows shield, as the spell (The Primer of Practical Magic (2004, 3.5E, 4,000gp))

iridescent blue sphere: increases Wisdom; "of Insight" (Mordenkainen's Magnificent Emporium (2011, 4E, 225,000gp))

iridescent green dodecahedron: bestows entropic shield, as the spell (The Primer of Practical Magic (2004, 3.5E, 3,000gp))

iridescent green octahedron: bestows haste, as the spell (The Primer of Practical Magic (2004, 3.5E, 8,000gp))

iridescent scarlet scalahedron: bestows alter self, as the spell (The Primer of Practical Magic (2004, 3.5E, 1,500gp))

iron-marbeled milk-colored stone: protects against ranged attacks (interception); "of Greater Interception" (101 Ioun Stones (2020, 5E, Rare))

iron-marbeled milk-colored stone: protects against range attacks (interception); "of Interception" (101 Ioun Stones (2020, 5E, Uncommon))

jade nodule: provides extra arcane resources (Boundless Magic III: Ioun Stones (2019, PF1, 10,000gp))

jagged green stone: damage a creature that damaged you (piercing); "of Retaliation" (101 Ioun Stones (2020, 5E, Rare))

jagged violet stone: damage a creature that damaged you (lightning); "of Static" (101 Ioun Stones (2020, 5E, Very Rare))

jet black void: sentient; artifact; grants user low-light vision and insight into foe weaknesses (Open Grave: Secrets of the Undead (2009, 4E))

lapis lazuli dodecahedron: improves Charisma saving throw; "of Personality" (101 Ioun Stones (2020, 5E, Rare))

lavender ellipsoid: grants immunity against special effects of undead attacks (True Dungeon Token Guide Compendium (2016))

lavender & blue ellipsoid: absorbs highest-level spells (True Arcane Story: Ioun Stones (2007, 3.0E, 80,000gp))

lavender & green ellipsoid: absorbs high-level spells; "of Greater Absorption" (DMG (1979, 1E); DMG Revised (1992, 2E); DMG (2000, 3.0E, 40,000gp); DMG (2003, 3.5E, 40,000gp); Lords of Darkness (2001, 3.0E); PFCRB (2009, PF1E, 40,000gp); DMG (2014, 5E, Legendary))

lavender & green ellipsoid: absorbs high-level spells (PFSSoS (2009, PF1E, 40,000gp))

light blue pearl: shoots bead of force; "of Catapult" (101 Ioun Stones (2020, 5E, Very Rare))

light blue pearl: grants prestidigitation effects; "of Presentation" (101 Ioun Stones (2020, 5E, Uncommon))

light blue prism: grants ability to understand all spoken languages (Dragon issue #174 "Bazaar of the Bizarre: Ioun Stones" (1991, 2E); Encyclopedia Magica Volume 2 (1995, 2E))

lime green prism: ignore heat and cold (Kobold Quarterly #06 "Rolling Stones" (2008, PF1E, 30,000gp); Deep Magic (2014, PF1E, 30,000gp))

magenta disk: improves spellcasting (overall) (A Baker's Dozen of Ioun Stones (2016, PF1E, 162,000gp))

magenta prism: increases one attribute (player's choice) (PFS Primer (2013, PF1E, 16,000gp))

marbeled gold ellipsoid: enhances spells of random elemental damage; "of Elemental Finesse" (101 Ioun Stones (2020, 5E, Very Rare))

marble sphere: protects ioun stones (durability/displacement) (Kobold Quarterly #06 "Rolling Stones" (2008, PF1E, 6,500gp); Deep Magic (2014, PF1E, 6,500gp))

maroon star: user can be harmed only by magic weapons and spells (Dragon issue #174 "Bazaar of the Bizarre: Ioun Stones" (1991, 2E); Encyclopedia Magica Volume 2 (1995, 2E))

matte black pyramid: protects against negative energy (A Baker's Dozen of Ioun Stones (2016, PF1E, 136,500gp))

midnight black star: protects against critical hits (Boundless Magic III: Ioun Stones (2019, PF1, 30,000gp))

milky white ellipsoid: grants darkvision (True Arcane Story: Ioun Stones (2007, 3.0E, 5,000gp))

mirrored sphere: reflects spells (True Arcane Story: Ioun Stones (2007, 3.0E, 100,000gp))

mithral pyramid: protects against special effects of undead attacks (True Dungeon Token Guide Compendium (2016))

moss green spindle: improves speed, protects against trip attacks (Boundless Magic III: Ioun Stones (2019, PF1, 4,000gp))

mossy disk: improves knowledge skills (PFSSoS (2009, PF1E, 2,500gp))

mottled gray sphere: counters magic, bestows invisibility (Lords of Darkness (2001, 3.0E))

mottled green egg-shaped stone: enhances innate ability, lizardfolk only; "Semuanya's Hunger" (101 Ioun Stones (2020, 5E, Uncommon))

mulberry pentacle: improves interaction skills (PFSSoS (2009, PF1E, 10,000gp))

nacreous gray sphere: protects against aging (PFSSoS (2009, PF1E, 10,000gp))

obsidian arrowhead: bestows gravity bow, as the spell thrice/day (Boundless Magic III: Ioun Stones (2019, PF1, 24,000gp))

ocean blue cabochon: grants water breathing (A Baker's Dozen of Ioun Stones (2016, PF1E, 144,000gp))

ochre spindle: grants 360º vision (Kobold Quarterly #06 "Rolling Stones" (2008, PF1E, 17,200gp); Deep Magic (2014, PF1E, 17,200gp))

onyx cube: increases Strength (True Dungeon Token Guide Compendium (2016))

onyx orb: enhances rest; "of Restfulness" (101 Ioun Stones (2020, 5E, Rare))

onyx rhomboid: increases Constitution (PFSSoS (2009, PF1E, 24,000gp))

onyx sphere: increases Strength slightly (True Dungeon Token Guide Compendium (2016))

opalescent octahedron: sentient; stores user's soul on death; "of Sentience" (101 Ioun Stones (2020, 5E, Legendary))

opalescent white pyramid: grants proficiency with one weapon (PFSSoS (2009, PF1E, 10,000gp))

opaque white cube: improves spellcasting (conjuration spells) (The Primer of Practical Magic (2004, 3.5E, 12,000gp))

opaque white sphere: bestows invisibility sphere, as the spell twice/day (A Baker's Dozen of Ioun Stones (2016, PF1E, 57,600gp))

orange cube: grants resistance to mind-affecting magic (Dragon issue #174 "Bazaar of the Bizarre: Ioun Stones" (1991, 2E); Encyclopedia Magica Volume 2 (1995, 2E))

orange dodecahedron: bestows telekinesis, as the spell; "of Telekinesis" (101 Ioun Stones (2020, 5E, Legendary))

orange ellipsoid: grants truesight; "of Seeing" (101 Ioun Stones (2020, 5E, Very Rare))

orange flawed prism: shoots orange ray of acid, then burns out & turns gray (True Arcane Story: Ioun Stones (2007, 3.0E, 4,550gp))

orange prism: improves spellcasting (overall) (PFCRB (2009, PF1E, 30,000gp); PFSSoS (2009, PF1E, 30,000gp))

orange thorny sphere: protects against sunder attacks (Inner Sea Combat (2014 PF1E, 8,000gp))

orange trefoil: protects against thought/alignment/lie detection; "of Bewilderment" (101 Ioun Stones (2020, 5E, Uncommon))

orange w/red flecks ellipsoid: protects against fire-based attacks and hot environments (A Baker's Dozen of Ioun Stones (2016, PF1E, 132,000gp))

pain gray cube: grants profiency with tools; "of Facility" (101 Ioun Stones (2020, 5E, Rare))

pale dodecahedron: grants understanding of all spoken languages; "of Understanding" (101 Ioun Stones (2020, 5E, Rare))

pale aquamarine prism: protects against fear when near allies; "of Steadfastness" (Adventurer's Vault (2008, 4E, 425,000gp))

pale blue prism: grants immunity to petrification (True Arcane Story: Ioun Stones (2007, 3.0E, 20,000gp))

pale blue rhomboid: increases Strength; "of Strength" (DMG (1979, 1E); DMG Revised (1992, 2E); DMG (2000, 3.0E, 8,000gp); DMG (2003, 3.5E, 8,000gp); PFCRB (2009, PF1E, 8,000gp); PFSSoS (2009, PF1E, 8,000gp); DMG (2014, 5E, Very Rare))

pale blue rhomboid: increases Strength; "of Might" (Mordenkainen's Magnificent Emporium (2011, 4E, 225,000gp))

pale green cube: improves spellcasting (divination spells) (The Primer of Practical Magic (2004, 3.5E, 8,000gp))

pale green cylinder: improves spellcasting (spells last longer) (The Primer of Practical Magic (2004, 3.5E, 12,000gp))

pale green dipyramid: bestows suggestion, as the spell (The Primer of Practical Magic (2004, 3.5E, 8,000gp))

pale green dodecahedron: bestows barkskin, as the spell (The Primer of Practical Magic (2004, 3.5E, 5,000gp))

pale green ellipsoid: absorbs high-level spells (The Strategic Review, Vol. 1 Issue 4; Encyclopedia Magica Volume 2 (1995, 2E))

pale green lozenge: bestows nondetection, as the spell (Dragon Annual #2 "Dragonwyr" (1997, 2E))

pale green prism: adds bonus to everything/extra experience level; "of Mastery" (DMG (1979, 1E); DMG Revised (1992, 2E); DMG (2000, 3.0E, 30,000gp); DMG (2003, 3.5E, 30,000gp); Lords of Darkness (2001, 3.0E); PFCRB (2009, PF1E, 30,000gp); PFSSoS (2009, PF1E, 30,000gp); DMG (2014, 5E, Legendary))

pale green rhomboid: improves interaction skills (A Baker's Dozen of Ioun Stones (2016, PF1E, 1,600gp))

pale green scalahedron: bestows nondetection, as the spell (The Primer of Practical Magic (2004, 3.5E, 2,000gp))

pale lavender dodecahedron: bestows mage armor, as the spell (The Primer of Practical Magic (2004, 3.5E, 7,000gp))

pale lavender ellipsoid: absorbs low-level spells; "of Absorption" (DMG (1979, 1E); DMG Revised (1992, 2E); DMG (2000, 3.0E, 20,000gp); DMG (2003, 3.5E, 20,000gp); PFCRB (2009, PF1E, 20,000gp); PFSSoS (2009, PF1E, 20,000gp); DMG (2014, 5E, Very Rare))

pale lavender octahedron: bestows improved invisibility, as the spell (The Primer of Practical Magic (2004, 3.5E, 20,000gp))

pale lavender spindle: sustains w/o food & water (The Strategic Review, Vol. 1 Issue 4; Encyclopedia Magica Volume 2 (1995, 2E))

pale orange rhomboid: stores user's soul on death (PFS Primer (2013, PF1E, 200,000gp))

pale ruby trillian: improves stealth skills (PFSSoS (2009, PF1E, 5,000gp))

pale turquoise prism: doubles carrying capacity (Kobold Quarterly #06 "Rolling Stones" (2008, PF1E, 5,000gp); Deep Magic (2014, PF1E, 5,000gp))

pale white dodecahedron: bestows darkvision, as the spell (The Primer of Practical Magic (2004, 3.5E, 2,000gp))

pale white sphere: recalls spells (Lords of Darkness (2001, 3.0E))

pale yellow lozenge: bestows water walk, as the spell (Dragon issue #174 "Bazaar of the Bizarre: Ioun Stones" (1991, 2E); Encyclopedia Magica Volume 2 (1995, 2E))

pale yellow prism: sheds light on command (Kobold Quarterly #06 "Rolling Stones" (2008, PF1E, 250gp); Deep Magic (2014, PF1E, 250gp))

pale yellow torus: sense emotions (unwilling); "of Intuition" (101 Ioun Stones (2020, 5E, Very Rare))

pearlescent star: improves athletic skills; "Northern Star Ioun Stone" (Heroes From the Fringe (2018, PF1E, 10,000gp))

pearlized brown ellipsoid: grants haste for 10 rounds/day (Lords of Darkness (2001, 3.0E))

pearly black spindle: regenerates damage for undead (Lords of Darkness (2001, 3.0E))

pearly white prism: regenerates damage (The Strategic Review, Vol. 1 Issue 4; Encyclopedia Magica Volume 2 (1995, 2E))

pearly white spindle: regenerates damage; "of Regeneration" (DMG (1979, 1E); DMG Revised (1992, 2E); DMG (2000, 3.0E, 20,000gp); DMG (2003, 3E, 20,000gp); PFCRB (2009, PF1E, 20,000gp); PFSSoS (2009, PF1E, 20,000gp); DMG (2014, 5E, Legendary))

pentagonal green pyramid: grants ability to consume anything; "of Omnivorousness" (101 Ioun Stones (2020, 5E, Rare))

pink ellipsoid: increases Constitution (The Strategic Review, Vol. 1 Issue 4; Encyclopedia Magica Volume 2 (1995, 2E))

pink rhomboid: increases Constitution; "of Fortitude" (DMG (1979, 1E); DMG Revised (1992, 2E); DMG (2000, 3.0E, 8,000gp); DMG (2003, 3.5E, 8,000gp); PFCRB (2009, PF1E, 8,000gp); PFSSoS (2009, PF1E, 8,000gp); DMG (2014, 5E, Very Rare))

pink rhomboid: increases Constitution; "of Vigor" (Mordenkainen's Magnificent Emporium (2011, 4E, 225,000gp))

pink & green ellipsoid: absorbs low-level spells (The Strategic Review, Vol. 1 Issue 4; Encyclopedia Magica Volume 2 (1995, 2E))

pink & green sphere: increases Charisma; "of Leadership" (DMG (1979, 1E); DMG Revised (1992, 2E); DMG (2000, 3.0E, 8,000gp); DMG (2003, 3.5E, 8,000gp); PFCRB (2009, PF1E, 8,000gp); PFSSoS (2009, PF1E, 8,000gp); DMG (2014, 5E, Very Rare))

pink & green sphere: increases Charisma; "of Allure" (Mordenkainen's Magnificent Emporium (2011, 4E, 225,000gp))

pink and green cube: improves spellcasting (illusion spells) (The Primer of Practical Magic (2004, 3.5E, 8,000gp))

pink and white ellipsoid: save the dying; "of Repose" (101 Ioun Stones (2020, 5E, Uncommon))

polished blue stone: increases swim speed, triton only; "Sea-Smoothed Stone" (101 Ioun Stones (2020, 5E, Uncommon))

polished steely sphere: enhances historical abilities; "of Historical Knowledge" (Lost Laboratory of Kwalish (2018, 5E, Rare))

puce cube: bestows telepathic ability to read minds (Dragon issue #174 "Bazaar of the Bizarre: Ioun Stones" (1991, 2E); Encyclopedia Magica Volume 2 (1995, 2E))

pulsing red spindle: protects against thought/alignment/lie detection (Boundless Magic III: Ioun Stones (2019, PF1, 16,000gp))

pulsing red star: protects against fire-based attacks (Dragon issue #174 "Bazaar of the Bizarre: Ioun Stones" (1991, 2E); Encyclopedia Magica Volume 2 (1995, 2E))

pure white octahedron: increases Charisma vs. beings of the same race (Dragon issue #174 "Bazaar of the Bizarre: Ioun Stones" (1991, 2E); Encyclopedia Magica Volume 2 (1995, 2E))

purple cabochon: regenerates stamina; "of Might" (Neverwinter MMORPG)

purple icosahedron: protects from effects; "of Avoidance" (101 Ioun Stones (2020, 5E, Legendary))

purple spindle: protects against charm/fear; "of Mindfulness" (101 Ioun Stones (2020, 5E, Very Rare))

purple trefoil: bestows antimagic field, as the spell; "of Denial" (101 Ioun Stones (2020, 5E, Legendary))

quicksilver cube: increases Dexterity (True Dungeon Token Guide Compendium (2016))

quicksilver sphere: increases Dexterity slightly (True Dungeon Token Guide Compendium (2016))

rainbow crystal: provides psionic power (Expanded Psionics Handbook (2004, 3.0E, 16,000gp))

rainbow ellipsoid: bestows levitation, as the spell (Dragon issue #174 "Bazaar of the Bizarre: Ioun Stones" (1991, 2E); Encyclopedia Magica Volume 2 (1995, 2E))

rainbow flawed ellipsoid: bestows prismatic spray, as the spell, then burns out & turns gray (True Arcane Story: Ioun Stones (2007, 3.0E, 9,100gp))

rainbow flawed sphere: bestows prismatic sphere, as the spell, then burns out & turns gray (True Arcane Story: Ioun Stones (2007, 3.0E, 15,300gp))

rainbow flawed spindle: bestows prismatic wall, as the spell, then burns out & turns gray (True Arcane Story: Ioun Stones (2007, 3.0E, 12,000gp))

rainbow prism: randomly changes power to different Ioun stone every day (Legends & Lairs: Spells and Spellcraft (2002, 3.0E, 30,000gp))

rainbow rhomboid: bestows plane shift, as the spell, once per day (True Arcane Story: Ioun Stones (2007, 3.0E, 28,000gp))

rainbow spindle: user can polymorph self for one hour (Dragon issue #174 "Bazaar of the Bizarre: Ioun Stones" (1991, 2E); Encyclopedia Magica Volume 2 (1995, 2E))

red cuboid: improves Strength saving throws; "of Might" (101 Ioun Stones (2020, 5E, Rare))

red flawed prism: shoots red ray of fire, then burns out & turns gray (True Arcane Story: Ioun Stones (2007, 3.0E, 4,550gp))

red ovoid: regenerates damage; "of Regeneration" (Adventurer's Vault (2008, 4E, 625,000gp))

red sphere: bestows protection from fire, as the spell (Dragon Annual #2 "Dragonwyr" (1997, 2E))

red star: grants understanding of all spoken/written languages; "Eastern Star Ioun Stone" (Occult Mysteries (2014, PF1E, 4,000gp))

red stone: enhances damage; "of Sanguination" (101 Ioun Stones (2020, 5E, Uncommon))

red jeweled crystal: gain fluency in one additional language; "of Language Knowledge" (Lost Laboratory of Kwalish (2018, 5E, Rare))

red needle-shaped stone: intimidates creatures; "of Menace" (101 Ioun Stones (2020, 5E, Rare))

rich green star: provides good luck (Lords of Darkness (2001, 3.0E))

rose-pink ellipsoid: communicate telepathically; "of Group Thought" (101 Ioun Stones (2020, 5E, Rare))

rose-pink ellipsoid: communicate telepathically; "of Shared Thoughts" (101 Ioun Stones (2020, 5E, Uncommon))

rough slate ellipsoid: enhances innate ability, goliath only; "of Lithic Will" (101 Ioun Stones (2020, 5E, Uncommon))

rough-hewn granite cube: protects against adverse environments; "of Extremophilia" (101 Ioun Stones (2020, 5E, Rare))

ruby cube: reduces fire damage slightly (True Dungeon Token Guide Compendium (2016))

ruby prism: reduces damage taken in melee slightly (True Dungeon Token Guide Compendium (2016))

ruby rhomboid: reduces fire damage greatly (True Dungeon Token Guide Compendium (2016))

ruddy brown ellipsoid: grants creature earth walk, earth genasi only; "of Mud" (101 Ioun Stones (2020, 5E, Common))

saffron yellow cone: bestows know direction, as the spell (The Primer of Practical Magic (2004, 3.5E, 1,000gp))

saffron yellow cylinder: improves spellcasting (cast spells faster) (The Primer of Practical Magic (2004, 3.5E, 10,000gp))

saffron yellow dipyramid: bestows tongues, as the spell (The Primer of Practical Magic (2004, 3.5E, 3,000gp))

saffron yellow scalahedron: bestows Leomund's tiny hut, as the spell (The Primer of Practical Magic (2004, 3.5E, 1,000gp))

salmon pink dipyramid: bestows read magic, as the spell (The Primer of Practical Magic (2004, 3.5E, 1,000gp))

salmon pink octahedron: bestows water walk, as the spell (The Primer of Practical Magic (2004, 3.5E, 5,000gp))

sapphire prism: increases defense (True Dungeon Token Guide Compendium (2016))

scarlet cone: bestows detect magic, as the spell (The Primer of Practical Magic (2004, 3.5E, 2,000gp))

scarlet cylinder: improves spellcasting (cast spells without moving) (The Primer of Practical Magic (2004, 3.5E, 10,000gp))

scarlet dodecahedron: bestows death ward, as the spell (The Primer of Practical Magic (2004, 3.5E, 4,000gp))

scarlet octahedron: bestows fly, as the spell (The Primer of Practical Magic (2004, 3.5E, 10,000gp))

scarlet pyramid: improves one skill (The Primer of Practical Magic (2004, 3.5E, 8,000gp))

scarlet & blue sphere: increases Intelligence; "of Intellect" (The Strategic Review, Vol. 1 Issue 4; DMG (1979, 1E); DMG Revised (1992, 2E); Encyclopedia Magica Volume 2 (1995, 2E); DMG (2000, 3.0E, 8,000gp); DMG (2003, 3.5E, 8,000gp); Lords of Darkness (2001, 3.0E); PFSSoS (2009, PF1E, 8,000gp); DMG (2014, 5E, Very Rare))

scarlet & blue sphere: increases Intelligence; "of Intellect" (Mordenkainen's Magnificent Emporium (2011, 4E, 225,000gp))

scarlet & green cabochon: bestows Encurance, as the feat (PFSSoS (2009, PF1E, 10,000gp))

scintillating dodecahedron: protects from previous damage; "of Adaptation" (101 Ioun Stones (2020, 5E, Very Rare))

scintillating yellow ellipsoid: bestows shock on melee attacks (Boundless Magic III: Ioun Stones (2019, PF1, 40,000gp))

shadowy grey rhomboid: improves perception and stealth skills (Boundless Magic III: Ioun Stones (2019, PF1, 7,500gp))

shining black spiral: allows teleportation 3 times/day (Lords of Darkness (2001, 3.0E))

sickly green prism: bestows corrosive on melee attacks (Boundless Magic III: Ioun Stones (2019, PF1, 40,000gp))

silver ellipsoid: protects against necromancy (Kobold Quarterly #06 "Rolling Stones" (2008, PF1E, 10,000gp); Deep Magic (2014, PF1E, 10,000gp))

silver ovoid: grants hovering; "of Hovering" (101 Ioun Stones (2020, 5E, Uncommon))

silver rod: protects against electrical-based attacks (Dragon issue #174 "Bazaar of the Bizarre: Ioun Stones" (1991, 2E); Encyclopedia Magica Volume 2 (1995, 2E))

silver sphere: negates rear attacks against user (Dragon issue #174 "Bazaar of the Bizarre: Ioun Stones" (1991, 2E); Encyclopedia Magica Volume 2 (1995, 2E))

silver spindle: bestows one spell (chosen when created) (PFS Primer (2013, PF1E, 24,000gp))

silver thorny sphere: protects against overrun attacks (Inner Sea Combat (2014 PF1E, 8,000gp))

silver w/gold flecks pentacle: fascinates creatures (A Baker's Dozen of Ioun Stones (2016, PF1E, 57,600gp))

silverish white spindle: grants truesight (True Arcane Story: Ioun Stones (2007, 3.0E, 50,000gp))

silvery gem: improves Intelligence savings throws; "of Self-Preservation" (Lost Laboratory of Kwalish (2018, 5E, Rare))

silvery marbeled ellipsoid: enhances spells of random elemental damage; "of Elemental Aptitude" (101 Ioun Stones (2020, 5E, Rare))

silvery mirror cube: protects against gaze-type petrification (Dragon issue #174 "Bazaar of the Bizarre: Ioun Stones" (1991, 2E); Encyclopedia Magica Volume 2 (1995, 2E))

sky blue octahedron: bestows freedom of movement, as the spell (The Primer of Practical Magic (2004, 3.5E, 4,000gp))

sky blue sphere: delay elemental damage (Kobold Quarterly #06 "Rolling Stones" (2008, PF1E, 27,000gp); Deep Magic (2014, PF1E, 27,000gp))

slate blue prism: infuses divine power (Kobold Quarterly #06 "Rolling Stones" (2008, PF1E, 20,600gp); Deep Magic (2014, PF1E, 20,600gp))

slimy gray stone: grants squeezing; "of Elasticity" (101 Ioun Stones (2020, 5E, Very Rare))

small iron ball: enhances crafting abilities, warforged only; "Cannith Protocol Augment" (101 Ioun Stones (2020, 5E, Common))

smoky black ellipsoid: wards an area; "of Hallowing" (101 Ioun Stones (2020, 5E, Rare))

smooth white crescent: bestows foresight, as the spell; "of Foreknowledge" (101 Ioun Stones (2020, 5E, Legendary))

soft black rectangle: protects against energy drain (Dragon issue #174 "Bazaar of the Bizarre: Ioun Stones" (1991, 2E); Encyclopedia Magica Volume 2 (1995, 2E))

sparkling iridescent sphere: improves acrobatic skills (Boundless Magic III: Ioun Stones (2019, PF1, 4,000gp))

speckled lepidolite stone: bestows dream, as the spell; "of Dream-Sending" (101 Ioun Stones (2020, 5E, Rare))

spinning blue orb: increases speed; "of Swiftness" (101 Ioun Stones (2020, 5E, Rare))

starry sphere: wizard only; improves spellcasting (additional spells) (Boundless Magic III: Ioun Stones (2019, PF1, 24,000gp))

steel grey trillian: improves smithing skills (A Baker's Dozen of Ioun Stones (2016, PF1E, 1,600gp))

sticky black pyramid: grants spider climbing; "of Adherence" (101 Ioun Stones (2020, 5E, Rare))

swirling blue-green spindle: improves concentration skills for spellcasting (Boundless Magic III: Ioun Stones (2019, PF1, 10,000gp))

tan ellipsoid: identifies spells and magic (Kobold Quarterly #06 "Rolling Stones" (2008, PF1E, 2,240gp); Deep Magic (2014, PF1E, 2,240gp))

teal pyramid: improves Dexterity saving throws; "of Adrenaline" (101 Ioun Stones (2020, 5E, Rare))

teal thorny sphere: protects against disarm attacks (Inner Sea Combat (2014 PF1E, 8,000gp))

tiny golden gem: enhances religious abilities; "of Religious Knowledge" (Lost Laboratory of Kwalish (2018, 5E, Rare))

tiny sparkling diamond: enhances performance abilities; "of Performance" (101 Ioun Stones (2020, 5E, Rare))

topaz sphere: reduces Darkrift damage (True Dungeon Token Guide Compendium (2016))

topaz spiky gem: cures exhaustion; "of Rejuvenation" (101 Ioun Stones (2020, 5E, Very Rare))

topaz trillian: protects against Darkrift energy (True Dungeon Token Guide Compendium (2016))

tourmaline sphere: delays death (PFS Primer (2013, PF1E, 1,000gp))

translucent rhomboid: grants translucence; "of Translucence" (101 Ioun Stones (2020, 5E, Uncommon))

translucent crystal pyramid: improves concentration skills for spellcasting; "of Perpetuation" (101 Ioun Stones (2020, 5E, Legendary))

translucent triangular prism: improves spellcasting (illusions); "of Misperception" (101 Ioun Stones (2020, 5E, Very Rare))

transparent glasslike sphere: enhances tracking; "of Bloodscent" (101 Ioun Stones (2020, 5E, Uncommon))

turquoise sphere: improves mount-related abilities (PFSSoS (2009, PF1E, 6,000gp))

vermilion rhomboid: improves athletic skills (PFSSoS (2009, PF1E, 10,000gp))

vibrant blue prism: stores 4th-level spell (True Arcane Story: Ioun Stones (2007, 3.0E, 48,000gp))

vibrant colored sphere: enhances innate ability, dragonborn only; "of Chromatic Rage" (101 Ioun Stones (2020, 5E, Uncommon))

vibrant green prism: stores 5th-level spell (True Arcane Story: Ioun Stones (2007, 3.0E, 60,000gp))

vibrant indigo prism: stores 2nd-level spell (True Arcane Story: Ioun Stones (2007, 3.0E, 24,000gp))

vibrant orange prism: stores 7th-level spell (True Arcane Story: Ioun Stones (2007, 3.0E, 84,000gp))

vibrant purple icosahedron: augments experience gain; "Icosahedron" (Neverwinter MMORPG)

vibrant purple prism: stores spells; "of Reserve" (DMG (1979, 1E); DMG Revised (1992, 2E); DMG (2000, 3.0E, 36,000gp); DMG (2003, 3.5E, 36,000gp); PFCRB (2009, PF1E, 36,000gp); PFSSoS (2009, PF1E, 36,000gp); DMG (2014, 5E, Rare))

vibrant purple prism: stores 3rd-level spell (True Arcane Story: Ioun Stones (2007, 3.0E, 36,000gp))

vibrant red prism: stores 8th-level spell (True Arcane Story: Ioun Stones (2007, 3.0E, 96,000gp))

vibrant yellow prism: stores 6th-level spell (True Arcane Story: Ioun Stones (2007, 3.0E, 72,000gp))

violet flawed prism: shoots blue ray that sends target to another plane, then burns out & turns gray (True Arcane Story: Ioun Stones (2007, 3.0E, 4,550gp))

violet prism: absorbs low-level spells (True Dungeon Token Guide Compendium (2016))

violet thorny sphere: protects against grapple attacks (Inner Sea Combat (2014 PF1E, 8,000gp))

white heptagon: can create trinkets; "of Creation" (101 Ioun Stones (2020, 5E, Rare))

white hyperboloid: grants echolocation; "of Echolocation" (101 Ioun Stones (2020, 5E, Rare))

white lozenge: protects against adverse environments; "of Solace" (101 Ioun Stones (2020, 5E, Very Rare))

white spherical stone: copies magical ability; "of Capture" (101 Ioun Stones (2020, 5E, Very Rare))

white and blue checkered cube: communicate telepathically; "of Divulgence" (101 Ioun Stones (2020, 5E, Very Rare))

white and brown lozenge: grants eagle vision; "of Perception" (101 Ioun Stones (2020, 5E, Rare))

white and green marbeled rhomboid: find path; "of Location" (101 Ioun Stones (2020, 5E, Uncommon))

white and pink rhomboid: enhances persuasiveness, grants fluency in all spoken languages; "of Perfect Language" (Adventurer's Vault (2008, 4E, 325,000gp); Mordenkainen's Magnificent Emporium (2011, 4E, 325,000gp))

white marbeled ellipsoid: enhances spells of random elemental damage; "of Elemental Rudiment" (101 Ioun Stones (2020, 5E, Uncommon))

white quartz ellipsoid: sustains creature w/o air, air genasi only; "of Bracing Wind" (101 Ioun Stones (2020, 5E, Common))

white w/blue flecks pentacle: protects against cold-based attacks and cold environments (A Baker's Dozen of Ioun Stones (2016, PF1E, 132,000gp))

wine-dark blue octahedron: bestows feather fall, as the spell (The Primer of Practical Magic (2004, 3.5E, 3,000gp))

writing-inscribed granodiorite ellipsoid: gain fluency in one random language; "of Comprehension" (101 Ioun Stones (2020, 5E, Common))

yellow flawed prism: shoots yellow ray of lightning, then burns out & turns gray (True Arcane Story: Ioun Stones (2007, 3.0E, 4,550gp))

yellow prism: increases one attribute (chosen at random) for 12 hours once/day; "Balian's Yellow Ioun Stone" (Fantasy Collector Card #26 (1992); Encyclopedia Magica Volume 2 (1995, 2E))

yellow sphere: sheds light on command (Dragon issue #174 "Bazaar of the Bizarre: Ioun Stones" (1991, 2E); Encyclopedia Magica Volume 2 (1995, 2E))

yellow spindle: protects against petrification (Dragon Annual #2 "Dragonwyr" (1997, 2E))

yellow and red torus: either improves or hinders checks; "of Chaos" (101 Ioun Stones (2020, 5E, Rare))

yellow w/black striations sphere: improves missile weapon skills (A Baker's Dozen of Ioun Stones (2016, PF1E, 4,000gp))

yellow-green sphere: adds to defense; "of Radiance" (Neverwinter MMORPG)