An Ioun stone is named after Ioun, a god of knowledge and prophecy revered on some worlds. 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. This pearly white spindle allows you to regain 15 hit points at the end of each hour while this orbits your head, provided that you have at least 1 hit point.