Item Type: Wondrous Item

Item Rarity: Rare

Requires Attunement: Yes

D&D Beyond: Ioun Stone (Sustenance)

Source: Dungeon Master’s Guide

Consumable: No

Roughly marble-sized, Ioun Stones orbit your head and confer benefits. As a Magic action, toss one into the air; it orbits 1d3 feet from your head. You can have up to three orbiting at once. An orbiting stone counts as an object you’re wearing, avoids collisions and attempts to attack or snatch it, and can be seized and stowed by you with a Utilize action. If Attunement ends while it is orbiting, it falls.

Types:

Absorption (Very Rare). Pale lavender ellipsoid. Reaction: cancel a spell of level 4 or lower cast by a creature you can see. After canceling 20 total spell levels, it burns out and loses its magic.

Agility (Very Rare). Deep-red sphere. Dexterity +2, maximum 20.

Awareness (Rare). Dark-blue rhomboid. Advantage on Initiative rolls and Wisdom (Perception) checks.

Fortitude (Very Rare). Pink rhomboid. Constitution +2, maximum 20.

Greater Absorption (Legendary). Marbled lavender-and-green ellipsoid. Reaction: cancel a spell of level 8 or lower you can see cast. After canceling 20 total spell levels, it burns out.

Insight (Very Rare). Incandescent blue sphere. Wisdom +2, maximum 20.

Intellect (Very Rare). Marbled scarlet-and-blue sphere. Intelligence +2, maximum 20.

Leadership (Very Rare). Marbled pink-and-green sphere. Charisma +2, maximum 20.

Mastery (Legendary). Pale green prism. Proficiency Bonus +1.

Protection (Rare). Dusty-rose prism. Armor Class +1.

Regeneration (Legendary). Pearly white spindle. Regain 15 Hit Points at the end of each hour if you have at least 1 Hit Point.

Reserve (Rare). Vibrant purple prism. Stores up to 4 levels of spells cast into it. A creature can cast a level 1–4 spell into it by touching the stone as the spell is cast. While it orbits your head, you can cast stored spells using the original caster’s slot level, save DC, spell attack bonus, and spellcasting ability.

Strength (Very Rare). Pale blue rhomboid. Strength +2, maximum 20.

Sustenance (Rare). Clear spindle. You don’t need to eat or drink.