Ioun Stone of The Vicar

An Ioun stone is named after Ioun, a goddess of knowledge and prophecy. The stone of the Vicar manifests as a multipoint star made of diamond.

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.

Stone of the Vicar. The attuned user is granted 3 additional attunement slots which may only be filled by Ioun Stones. 

Notes: Set: Attunement Slots, worshippers of Ioun, Buff