Roughly marble sized, Ioun Stones are named after Ioun, a god of knowledge and prophecy revered on some worlds. Many types of Ioun Stones exist, each type a distinct combination of shape and color. And you've got a whole bag of 'em! The bag also contains several of the older, less powerful and less durable Congenio's Pebbles.
When you take a Magic action to toss an Ioun Stone into the air, the stone orbits your head at a distance of 1d3 feet, conferring its benefit to you while doing so. At any given time you can have a number of Ioun Stones orbiting your head at the same time up to each point of your spellcasting ability above ten, plus three.
Each Ioun Stone has AC 24, 10 hit points, and resistance to all damage. It is considered to be an object that is being worn while it orbits your head. The orbiting stone avoids contact with other creatures and objects, adjusting its orbit to avoid collisions and thwarting all attempts by other creatures to attack or snatch it.
As a Utilize action, you can seize and stow any number of Ioun Stones orbiting your head.
Instead of tossing the stone in the air, you can toss at an ally you can see within 15 feet. If you're in combat, roll 1d12: the stone orbits that ally's head on a 2-12 and falls to the ground on a 1. If you're not in combat, no roll is necessary.
The stone or pebble you use is determined as follows: you can use an Action to select one or you can use a Bonus Action to roll D100 on the following table to grab one at random. If you roll a stone that you already have orbiting you or that is on cooldown, the roll fails and you don't grab anything.
1-2 - Congenio's Anhedral Pebble: While this anhedral ruby orbits your head, you add 1d4 to all attack rolls and saving throws.
3-4 - Congenio's Echinid Pebble: While this limestone echinid orbits your head, you are under the effects of the Detect Magic spell.
5-6 - Congenio's Decahedron Pebble: While this jade decahedron orbits your head, you can go without water indefinitely.
7-8 - Congenio's Heptahedron Pebble: While this sapphire heptahedron orbits your head, you gain +1 to saving throws against lightning and electricity.
9-10 - Congenio's Lozenge Pebble: While this onyx lozenge orbits your head, you gain a +1 to Wisdom saving throws.
11-14 - Congenio's Rhomboid Pebble: While this rhomboid piece of limestone orbits your head, it absorbs the first 10 damage you receive. After it receives 10 damage, it returns to the bag and cannot be used again until after your next Long Rest.
15-16 - Congenio's Sphere: While this obsidian sphere orbits your head, you gain a +1 to Constitution saving throws.
17-19 - Congenio's Stelloid Pebble: While this lapis lazuli stelloid orbits your head, you can go without food indefinitely.
20-23 - Congenio's Tetrapton Pebble: While this emerald tetrapton orbits your head, you gain +1 to saving throws against Cold of any kind.
24-25 - Congenio's Tiny Stone Rod: While this tiny rod made of marble orbits your head, you are under the effects of the Comprehend Languages spell.
26-28 - Congenio's Triclinid Pebble: While this triclinid crystal orbits your head, you gain +1 to saving throws against fire of any kind.
29-31 - Congenio's Tubule Pebble: While this rough-hewn granite tubule orbits your head, you have Darkvision for 60 feet.
32 - Ioun Stone, Absorption: While this pale lavender ellipsoid orbits your head, you can take a Reaction to cancel a spell of level 4 or lower cast by a creature you can see. A canceled spell has no effect, and any resources used to cast it are wasted. Once the stone has canceled 20 levels of spells, it crumbles into dust and is destroyed.
33 - Ioun Stone, Agility: Your Dexterity increases by 2, to a maximum of 30, while this deep-red sphere orbits your head.
34 - Ioun Stone, Awareness: While this dark-blue rhomboid orbits your head, you can't be surprised and have Advantage on Initiative rolls and Wisdom (Perception) checks.
35 - Ioun Stone, Bronze Ovoid: While this bronze ovoid orbits your head, you have one additional spell slot of a level you choose when it begins orbit.
36 - Ioun's Stone, Cubic: While this polished cubic diamond orbits your head, your Dexterity and Agility are increased by 1.
37 - Ioun Stone, Dendroid: While this quartzite dendroid orbits your head, your Wisdom and Intelligence are increased by 1.
38 - Ioun Stone, Dodecahedron: While this alabaster dodecahedron orbits your head, your Constitution and Strength are increased by 1.
39 - Ioun Stone, Enneid: While this bluestone enneid orbits your head, your Charisma is increased by 1.
40 - Ioun Stone, Fortitude: Your Constitution increases by 2, to a maximum of 30, while this pink rhomboid orbits your head.
41 - Ioun Stone, Greater Absorption: While this marbled lavender and green ellipsoid orbits your head, you can take a Reaction to cancel a spell of level 9 or lower cast by a creature you can see. A canceled spell has no effect, and any resources used to cast it are wasted. Once the stone has canceled 20 levels of spells, or if you use it to cancel a level 9 spell, it crumbles into dust and is destroyed.
42 - Ioun Stone, Heptid: If this dolomite heptid is orbiting your head when you make a third failed death save, you are returned to life with 1 hit point and this stone turns to dust.
43-45 - Ioun Stone, Historical Knowledge: You gain proficiency in the History skill, or a +1 bonus to checks with that skill if already proficient, while this polished, steely sphere orbits your head.
46 - Ioun Stone, Insight: Your Wisdom increases by 2, to a maximum of 30, while this incandescent blue sphere orbits your head.
47 - Ioun Stone, Intellect: Your Intelligence increases by 2, to a maximum of 30, while this marbled scarlet and blue sphere orbits your head.
48-49 - Ioun Stone, or maybe just a shiny rock: While this shiny rock is orbiting your head, you feel good about yourself and have more positive self-talk.
50-51 - Ioun Stone, Iridescent Spindle: While this spindle orbits your head, you can go without air indefinitely.
52 - Ioun Stone, Leadership: Your Charisma increases by 2, to a maximum of 30, while this marbled pink and green sphere orbits your head.
50-53 - Ioun Stone, Linguistic Knowledge: You are fluent in one additional language while this pulsating bit of red jeweled crystal orbits your head. The DM chooses the language bestowed by the stone.
54 - Ioun Stone, Mastery: Your Proficiency Bonus increases by 1 while this pale green prism orbits your head.
55-57 - Ioun Stone, Natural Knowledge: You gain proficiency in the Nature skill, or a +1 bonus to checks with that skill if already proficient, while this burnished, brassy stone orbits your head.
58 - Ioun Stone, Orange Prism: While this prism orbits your head, all spells cast at Level 1 count as if they were cast at Level 2.
59 - Ioun Stone, Pentahedron: While this basalt pentahedron is orbiting your head, you have an extra spell slot of each level of spell you have access to, up to Level 5.
60-61 - Ioun Stone, Protection: You gain a +1 bonus to Armor Class while this dusty-rose prism orbits your head.
62-64 - Ioun Stone, Puce Cube: While this cube of puce is orbiting your head, you are under the effects of the Detect Thoughts spell.
65 - Ioun Stone, Regeneration: You regain 15 Hit Points at the end of each hour this pearly white spindle orbits your head if you have at least 1 Hit Point.
66-68 - Ioun Stone, Religious Knowledge: You gain proficiency in the Religion skill, or a +1 bonus to checks with that skill if already proficient, while this tiny golden gem orbits your head.
69 - Ioun Stone, Reserve: This vibrant purple prism stores spells cast into it, holding them until you use them. The stone can store up to 4 levels of spells at a time. When found, it contains 1d4 levels of stored spells chosen by the DM. Any creature can cast a spell of level 1 through 4 into the stone by touching it as the spell is cast. The spell has no effect, other than to be stored in the stone. If the stone can't hold the spell, the spell is expended without effect. The level of the slot used to cast the spell determines how much space it uses. While this stone orbits your head, you can cast any spell stored in it. The spell uses the slot level, spell save DC, spell attack bonus, and spellcasting ability of the original caster but is otherwise treated as if you cast the spell. The spell cast from the stone is no longer stored in it, freeing up space.
70-73 - Ioun Stone, Self-Preservation: You gain a +1 bonus to Intelligence saving throws while this silvery gem orbits your head.
74-77 - Ioun Stone, Shining Black Spiral: While this spiral orbits your head, you can cast Teleport once per day.
77 - Ioun Stone, Spirit Storage: If you die while this rose-quartz sphere is orbiting your head, your soul is absorbed into the stone, allowing resurrection via a Restoration spell for an indefinite period of time after death.
78 - Ioun Stone, Strength: Your Strength increases by 2, to a maximum of 30, while this pale blue rhomboid orbits your head.
79 - Ioun Stone, Superior Reserve: This marbled green and purple prism stores spells cast into it, holding them until you use them. The stone can store up to 10 levels of spells at a time. When found, it contains 1d10 levels of stored spells chosen by the DM. Any creature can cast a spell of level 1 through 6 into the stone by touching it as the spell is cast. The spell has no effect, other than to be stored in the stone. If the stone can't hold the spell, the spell is expended without effect. The level of the slot used to cast the spell determines how much space it uses. While this stone orbits your head, you can cast any spell stored in it. The spell uses the slot level, spell save DC, spell attack bonus, and spellcasting ability of the original caster but is otherwise treated as if you cast the spell. The spell cast from the stone is no longer stored in it, freeing up space.
80-81 - Ioun Stone, Supreme Intellect: You gain a +1 bonus to Intelligence checks while this faceted sphere orbits your head.
82-85 - Ioun Stone, Sustenance: You don't need to eat or drink while this clear spindle orbits your head.
86-89 - Ioun Stone, Trollblood: While this ancient piece of crystallized trollblood orbits your head, you make attack rolls against Trolls with Advantage and add 1d4 to damage rolls against them. You also regenerate 5 HP at the start of each of your turns.
90-91 - Ioun Stone, Vitality: You roll with Advantage on, and gain a +1 bonus to, death saving throws while this luminous green-and-blue marbled sphere orbits your head. Allies within five feet of you also gain the +1 bonus to death saving throws.
In addition, there are a few mysterious ioun stones in the bag that have no effect until you cast Identify on them:
92 - Balian's Yellow Ioun Stone: While this faulty yellow ioun stone orbits your head, you gain +1 to an ability score chosen at random by rolling D6. Every dawn, this ability score is rerolled. 1-Strength, 2-Dexterity, 3-Constitution, 4-Intelligence, 5-Wisdom, 6-Charisma.
93-96 - Malla's Soul Stone: This tear-shaped star sapphire once contained the soul of a woman named Malla. She has since been freed, and much of its power went with her, but while this stone orbits your head you gain +1 to Agility, Constitution, and Dexterity saving throws.
97 - Mantle Stone of Vhyridaan: This vibrant-purple prism, imbued with the very soul of Vhyridaan the Mad, stores spells cast into it, holding them until you use them. The stone can store up to 10 levels of spells at a time. When found, it contains 1d10 levels of stored spells chosen by the DM. Any creature can cast a spell of level 1 through 6 into the stone by touching it as the spell is cast. The spell has no effect, other than to be stored in the stone. If the stone can't hold the spell, the spell is expended without effect. The level of the slot used to cast the spell determines how much space it uses. While this stone orbits your head, you can cast any spell stored in it. The spell uses the slot level, spell save DC, spell attack bonus, and spellcasting ability of the original caster but is otherwise treated as if you cast the spell. The spell cast from the stone is no longer stored in it, freeing up space. In addition, you can take a Reaction to cancel a spell of level 9 or lower cast by a creature you can see. A canceled spell has no effect, and any resources used to cast it are wasted. When the number of spell levels cast or canceled by the stone reaches or exceeds 40, it becomes inert and takes 10 days to recharge.
98-100 - Wong Fei's Ioun Stone: This pale green ovoid originally belonged to the monk Wong Fei, and is said to have been in the possession of the drow Bhaalspawn priestess Sendai when she fought Gorion's Ward. While it's orbiting your head, you gain +1 to Armor Class and +15 to maximum HP and you regenerate 1 HP per turn.
Also, if you have Identified the Mantle Stone of Vhyridaan, you can telepathically communicate with him. You could also let him out. He is very insane after more than a thousand years trapped in a rock, so who knows how that might go.
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