Ioun stone

Ioun stones, originally called Congenio's pebbles and Ioun's stones, were magical stones that floated around a bearer's head and granted a range of enhancements or powers to a creature.

Description
They were small, crystalline stones, coming in a wide range of colors and shapes that determined their powers. Unattended ioun stones tended to hover and drift about by themselves. They were known to glow and occasionally to emit faint, musical sounds, sounding rather like chimes or a harp, in single notes or longer chords.

Function
Ioun stones hovered permanently in the air, but otherwise remained motionless.

When one acquired a stone and wished to receive its benefits, they had to first hold it firmly for a brief time in order to attune themselves and imprint their own magnetic aura into its structure, and then release it or toss it in the air. Thereafter, when functioning, the ioun stone orbited the bearer's head at a distance of 1–3 inchs, or else trailed after the bearer as they walked. Its path was affected by the user's own magnetic field: it generally followed a circular or elliptic pattern but could at times follow a random path, float unmoving in the air, or dance and bob erratically. Occasionally, a stone might drift up to 12 ft (3.7 m) from its owner, then swiftly return. Some users noted that if they examined something closely, then their ioun stones would move toward it.

An ioun stone held stored magical energy. An orbiting stone created a link with its owner, through which it regularly transferred small packets of this energy to them. This magical energy could enhance them in the various ways ioun stones were known for, or bestow more unusual powers. They could only bestow their benefit on an owner when orbiting within the given range. Two stones of the same type would repel each other, but many of different types could be used at once. After 1372 DR, there were also lesser ioun stones that gave the same benefits as full examples of their kind, but only one lesser ioun stone could be used at a time, even if of different types.

The bearer could freely grab and pocket a stone, such as when going to sleep, to keep it safe, but they could no longer receive its benefits. Another person could try to catch or net a hovering stone to steal it or break it. In any case, if shifted more than 3 ft (91 cm) from its owner, they ceased to function. If the user went to sleep without storing them, the stones hovered motionlessly over them. If the user was injured and lay dying, the orbit of the stones slowed and stayed close to their head. If the user died, the stone slowly drifted off in a random direction before slowly falling to the ground. However, if the user died suddenly or violently, the stone flew off at great sped in a random direction, fast enough to hurt if it impacted someone, or else hitting the ground up to 120 ft (37 m) away.

Some stones had only one or a set number of charges, after which they became drained of power and were considered burned out. Rarely, an ioun stone spontaneously burned out on its own (a 1 in 20 chance each year). Either way, a burned-out stone became dull grey and inert, but it still possessed the characteristic floating power. Although they were useless for magical purposes, they retained sufficient resonance for a psionicist to extract a smidgeon of psionic energy—enough to boost their psionic strength or to fuel the lowest of unaugmented powers—before it became completely burned out.

As with other items that could store magical energy, the pale lavender ellipsoid, lavender-and-green ellipsoid, and vibrant-purple prism could store spellfire. In turn, they could also be drained by a spellfire wielder.

Cursed and supercharged versions were known to exist.

Creation
Ioun stones could only be created by a veteran spellcaster well versed in the crafting of wondrous magical items.

Only certain types of gemstone could be transformed into an ioun stone through application of the appropriate and generally secret spells. These gems were known collectively as "the nine secrets", though there were at least ten. These were amethyst, chrysoberyl, chrysoprase, greenstone, hematite (though this was rarely known to even powerful wizards), iol (also known as iolite or cordierite, and the most effective of the gems), Laeral's tears (most little known and rarest of the gems), obsidian (the most well known), onyx, and sardonyx. In the time of ancient Netheril, the gems and stones selected for enchantment were actually imperfect or flawed, with the exception of the perfect euhedral stone.

Some ioun stones were apparently created using essences taken from a soul, and bestowed the benefits of these upon their owners. According to legend, the pearly-white ovoid was created from the enslaved soul of a troll, and granted the troll's ability to regenerate wounds. The pale green ioun stone came about when the dying warrior Rigar Trueblood begged his companion, the mage Spectorial, to preserve his skill and fortitude in battle. Although reluctant, Spectorial acceded and extracted these qualities from Rigar's soul, placing them in an ioun stone so that others might benefit from them. The unique Malla's soul stone, which acted as an ioun stone, contained the soul of an innocent young woman, and conferred many different benefits. Similarly, the mantle stone of Vhyridaan was a failed attempt to create a kiira that absorbed its creator, body and soul. Containing the trapped soul of the mage Vhyridaan the Mad, this unique ioun stone was a sentient item that Vhyridaan could steer somewhat to evade attacks.

On the other hand, some ioun stones seem to have merely been created from the blood of creatures with the necessary essences. Legend told that the Trollblood ioun stone, a dark-green sphere, was created from the blood of seven trolls that had each been captured and, over seven nights, used in experiments in magic. The ioun stone that was produced conferred a weaker form of a troll's ability to regenerate wounds, but also gave great skill in slaying trolls in combat.

Other applications
Ioun stones did not need to be set orbiting the head; it was possible to mount them in magical items kept close to the body. One possible example was the ioun blade, a +1 dagger with a socket in its hilt or pommel that could hold an ioun stone and bestow its benefit upon the wielder.

Related magic items were the gems of detection. These were miniature ioun stones, highly polished but of weaker material, that could be set into a chair. If one sat in the chair and touched the gem, they could use a specific detection spell, according to the gem, but only while seated in the chair.

There was value and use in burned-out ioun stones; for example, an apothecary in Loudwater in 1479 DR sold them.

History
Congenio Ioun, an early arcanist of the Nether Age of Netheril, created the first ioun stones in the year 397 NY (−3462 DR). At the time, Netherese priests and wizards alike believed that large objects such as shields and suits of armor were simply too big to be enchanted, and (mistakenly) assumed that only small or slender items—pebbles, small stones, pieces of cloth, daggers, and the like—could be enchanted to bear magic. Congenio worked under this assumption and so he worked exclusively with small, semi-polished stones, creating what were later thought to be the first true magical protection devices. This was a previously unheard-of achievement: he was aged only 33 and this was the first magical item he had created, marking him as one of the greatest arcanists of his age.

He initially called them Congenio's pebbles. He adopted the self-imposed limitation of enchanting all stones of the same shape with the same spell, making them more consistent for buyers and eliminating confusion. Congenio's pebbles soon became enormously popular with his fellow arcanists, and were in great demand. Over the next 54 years, the anhedral, echinid, hexagonoid, spindle, pebble, star, and round stones were developed and introduced. Following his model, it was common to enchant small stones or modest gems with basic spells like bless or shield to protect a warrior in battle.

In 451 NY (−3408 DR), at the suggestion of a close friend, Congenio renamed his pebbles to the much more catchy Ioun's stones. Under this name, the cephaloid, cube, cylinder, decipton, dendroid, dodecahedron, ellipsoid, enneid, euhedral, hectoid, helicid, heptid, monoclinoid, nephroid, ovoid, octahedron, orthorhomboid, peg, pentahedron, prism, pyramid, rectangle, septahedron, sexahedron, tile, and tredyhedron stones were created and became widespread in Netheril.

Congenio himself created over thirty of these, including the prism that allowed one to see in the dark and another that granted its holder a temporarily raised level of experience and might. He was never seen without them orbiting his head. He lived an incredibly long life, almost a thousand years, and some wondered if one of his stones was responsible for his longevity. Congenio finally passed away in 1319 NY (−2540 DR), but for his creations his name lived on for millennia.

After his death, a number of other arcanists continued his work. These researchers made breakthroughs in Congenio's original design, in that they simply ignored his consistent design and placed their own spells on whatever gem they had, no matter its shape. The stones became generally known as simply ioun stones around 1365 NY (c. −2494 DR). From this time on, the triclinid, tubule, decahedron, heptahedron, lozenge, rhomboid, rod, sphere, stelloid, and tetrapton stones were invented, until the fall of Netheril in 3520 NY (c. −339 DR).

A unique incandescent blue sphere surfaced around 1311 DR in Icewind Dale. In a past age, the githzerai craftsman Bashenee had created it for a great githzerai monk, who later fell in battle with githyanki. It circulated among them for many years, until it was given to the mind flayer Oinchack'olp, who treated it as a prized possession. Oinchack'olp was roaming the Underdark beneath Icewind Dale when he lost it, and some driders found it. Oinchack'olp ordered some passing adventurers to retrieve it.

By the 14th century, ioun stones were much desired, yet few people—even those who had them—knew where they had originated. Congenio Ioun himself had been long-forgotten, but his name lived on in his greatest creation. Only some sages of the arcane such as Prismal the Outrageous knew something of Congenio Ioun's story.

In the 1360s DR, the blood-red sphere, which improved balance, reflexes, and hand–eye coordination, was in great demand among those who used such skills such as rogues, thieves, and their ilk. Similarly, mages and wizards eagerly sought the bronze ovoid, which allowed one to memorize an extra high-level arcane spell, and the golden ovoid, which increased intellect.

Notable collections
Ioun stones were, at all times, quite rare and just as hard to acquire. They were a much-valued treasure, and considered well worth any risk to gather in numbers, owing to their useful powers.

Larloch, the Shadow King, the arch-lich of Warlock's Crypt and a long-surviving arcanist of Netheril, possessed over two dozen ioun stones, which orbited his skull at all times, giving him a wide variety of powers, protections, and enhancements. Some were much more powerful than their regular versions, and he had multiples of some.

In the Year of the Black Flame, 229 DR, in the kingdom of Athalantar, tales spread that a chest full of ioun stones had been discovered in the castle of Athalgard, in the city of Hastarl. They'd likely been hidden by King Uthgrael Aumar (reigned 183–216 DR) years before. The magelords of the kingdom argued over how they should be used—and how they should be shared among themselves. Until agreement was reached, King Belaur Aumar ordered that they be put on display to the public, under heavy guard in an audience chamber, to which wizards were forbidden to approach. The thief Farl had a notion to steal them, but his friend Eladar warned it all could be a trap laid by the magelords.

The Wyvern Crown of Cormyr was inlaid with ten ioun stones on the tips of its spikes. None of the stones could be removed from the Crown without destroying them, not without a wish spell on each stone.

A ring of a dozen ioun stones was occasionally sighted hovering above the River Vesper in the Vast from the 1350s DR on. The stones avoided efforts to grab them, and by 1370 DR, no one with a net, the ability to fly, or a magical means of catching one was lucky enough to spot the ring. A tale told in riverside taverns claimed that anyone who could grab one of the ioun stones could keep it, but was also compelled by a geas to perform some dangerous task, with a different task for each stone.

Known ioun stones
The following tables list the known ioun stones in each era, together with their benefits, costs, and other details.

In addition to these, it was rumored that Congenio Ioun himself had created another stone that had given him his great longevity; he lived almost a thousand years. He was also recorded as creating another that granted its holder a temporarily raised level of experience and might.

Background
The ioun stone has its basis in the IOUN stone (written all in capitals) appearing in the short story "Morreion" by Jack Vance, whose Dying Earth series was very influential on early Dungeons & Dragons. "Morreion" was first published in the Flashing Swords! #1 anthology in 1973. Here, IOUN stones are valuable items that nullify magic and are extracted at great risk from the cores of dead stars. With Vance's permission, the ioun stone was first developed for D&D in The Strategic Review #4 (1975), with the clear prism, deep-red sphere, incandescent blue sphere, pale green ellipsoid, pale lavender spindle, pearly white prism, pink ellipsoid, pink-and-green ellipsoid, and scarlet-and-blue sphere being the first to appear.

The article "Bazaar of the Bizarre: Ioun Stones" in Dragon #174 (1991) begins by describing Vance's original IOUN stones and presents two possible origins for the ioun stones. The main one is that ioun stones grow naturally but rarely on the Quasi-Elemental Plane of Minerals, at the intersection of the Elemental Plane of Earth with the Positive Energy Plane, and the article details the hazards in procuring them. The other idea is that powerful human wizards from another Prime Material Plane simply manufacture ioun stones, but describes this as straightforward, uninteresting, and lacking adventure.

Nevertheless, Encyclopedia Magica Volume II (1995) does just that, stating that the powerful human wizard Congenio Ioun invented them. Netheril: Empire of Magic (1996) follows suit, placing this origin in the Forgotten Realms, telling that Congenio Ioun was a Netherese wizard and that subsequent wizards manufactured more, as recounted in this article. Since this is Forgotten Realms material, this is the version adopted for this wiki.

D&D would once again forget and recreate the origin of the ioun stone when the 4th edition introduced a goddess of knowledge and prophecy called Ioun, inspired by the ioun stone. Open Grave presents a cursed artifact called the Jet Black Ioun Stone, and says that the goddess Ioun created ioun stones (including the Jet Black) to spread knowledge in all forms. However, she was not introduced to the 4th edition of the Forgotten Realms setting (although Zehir was, who had a hand in the Jet Black), so it must be assumed that neither the goddess Ioun, her creation of the ioun stones, or the Jet Black Ioun Stone exist in the setting. This leaves only their creation by the mortal wizard Congenio Ioun and others.

The drifting of the origin story continued in 5th edition with the eponymous creator being called a god of knowledge and prophecy, rather than a goddess. The stones were described as having a rigid correlation between the benefit they bestowed and the shape and color of the item. They were considered wondrous items valued by rarity and classified as Rare, Very Rare, or Legendary.