Ioun Stone Swarm

This collection of Ioun Stones belonged to Hull, the Wayfarer, during the Tyrant Era. Hull collected twelve stones on total, and bound them in an orbital swarm that followed him without counting as individual items. Hull was able to maintain up to five stones in the swarm at a time, and gain the benefit from them.
In the years following the defeat of the Beholder Empires, the stones were scattered across wildspace, and may be found as single or paired Ioun Stones.
Wondrous Item, legendary
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.
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. You can have up to three Ioun Stones orbiting your head at the same time.
Each Ioun Stone orbiting your head is considered to be an object you are wearing. 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. If your Attunement to an Ioun Stone ends while it’s orbiting your head, the stone falls as though you had dropped it.
The type of stone determines its rarity and effects.
Intellect (Very Rare). Your Intelligence increases by 2, to a maximum of 20, while this marbled scarlet and blue sphere orbits your head.
Insight (Very Rare). Your Wisdom increases by 2, to a maximum of 20, while this incandescent blue sphere sphere orbits your head.
Fortitude (Very Rare). Your Constitution increases by 2, to a maximum of 20, while this pink rhomboid orbits your head.
Resistance, Force (Very Rare). You gain Resistance to Force Damage, while this pitch black sphere orbits your head.
Resistance, Necrotic (Very Rare). You gain Resistance to Necrotic Damage, while this marbled green ans black sphere orbits your head.
Awareness (Rare) While this dark-blue rhomboid orbits your head, you have Advantage on Initiative rolls and Wisdom (Perception) checks.
Fortitude (Very Rare) Your Constitution increases by 2, to a maximum of 20, while this pink rhomboid orbits your head.
Greater Absorption (Legendary) While this marbled lavender and green ellipsoid orbits your head, you can take a Reaction to cancel a spell of level 8 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 burns out, turns dull gray, and loses its magic.
Leadership (Very Rare) Your Charisma increases by 2, to a maximum of 20, while this marbled pink and green sphere orbits your head.
Mastery (Legendary) Your Proficiency Bonus increases by 1 while this pale green prism orbits your head.
Protection (Rare) You gain a +1 bonus to Armor Class while this dusty-rose prism orbits your head.
Regeneration (Legendary) 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.

Item type

Magical