Is there a rule regarding casting a spell onto an existing ioun stone?
For example, can a character with an ioun stone orbiting his head cast light on it so that he doesn't have to carry a lantern or torch?
Could a wizard cast silence on an ioun stone orbiting around an ally's head in order to help that allied fighter rush an enemy wizard (in order to possibly negate the enemy wizard's spells that require a verbal component)?
There may be other examples - probably more creative ones - but the point of the question was to find out if there is a mechanic for such an action...like a DC to successfully do it or a rule that would negate such an action.
Thanks!
If the spell can target objects, it can target ioun stones. In fact, there's a magic item in one of Paizo's books called an ioun torch that is just a burnt-out ioun stone with continual flame cast on it.
If you want to cast it on an enemy's ioun stone, you'd have to make sure that the spell can be cast on attended items. Usually, if it can, it allows the item's owner a save to negate, just as if you'd cast the spell on the owner directly.
For example, can a character with an ioun stone orbiting his head cast light on it so that he doesn't have to carry a lantern or torch?
Yes. You can cast light on any object that you can physically touch.
Could a wizard cast silence on an ioun stone orbiting around an ally's head in order to help that allied fighter rush an enemy wizard (in order to possibly negate the enemy wizard's spells that require a verbal component)?
Yes. As long as the recipient of the spell (if cast on the Fighter) or the possessor of the item (if cast on the stone) is willing. Otherwise, the target would receive a saving throw as normal.
Thanks very much for the help guys!
