Ioun Stones are magical stones that affect the user in many different ways. When released, it will take up a circling orbit, above the user's head. The owner may seize and stow the stone to keep it safe, but loses the benefits of the stone during that time.
Note: This version of ioun stones originally appeared in the 2nd Edition Dungeon Master Guide for the Advanced Dungeons & Dragons game by TSR. Their inclusion here is for the purposes of providing context for the campaign only.