Ioun Stone Iridescent SphereUsable by: all, Barbarian, Bard, Cleric, Druid, Dwarf Fighter, Elf Wizard, Fighter, Monk, Paladin, Ranger, Rogue, WizardSlot: Ioun StoneRarity: UncommonYear: 2014Source: Standard PackBestows immunity to toxic gas Unlike Ioun Stone Iridescent Spindle, Ioun Stone Iridescent Sphere does not negate the need to breathe and is effectively useless underwater.