An Ioun stone is named after Ioun, a god of knowledge and prophecy revered on some worlds. Many types of Ioun stone exist, each type a distinct combination of shape and color.

When you use an action to toss one of these stones into the air, the stone orbits your head at a distance of 1d3 feet and confers a benefit to you. Thereafter, another creature must use an action to grasp or net the stone to separate it from you, either by making a successful attack roll against AC 24 or a successful DC 24 Dexterity (Acrobatics) check. You can use an action to seize and stow the stone, ending its effect.

A 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 Ioun Stone of Guardianship is a shield-shaped carved stone with a bisected coloring of black and white dividing its nature.

Guardianship. You get a +1 to your AC while this stone orbits your head but as an action, you can use a command word to send the stone to orbit the head of a single ally during battle that is within 30ft of you and they gain 5 temporary hit points, the stone returns to you once the temporary hit points are depleted or when you use an action to say the command word. The stone can not use the ability to grant temporary hit points in battle until after a short rest.

Notes: Bonus: Armor Class, Warding