Are multiples of the same ioun stone usable at the same time by the same person if they are "keyed" to different things?
For example, can I simultaneously benefit from both an Opalescent White Pyramid keyed to Bastard Swords and another Opalescent White Pyramid keyed to Whips to gain proficiency in both of them at the same time?
Or two mossy disks, each granting a bonus to a different Knowledge skill?
etc.
At first I thought the "same source" rule might kaibosh this, but it appears to be different in Pathfinder than it was in 3.5. The only Pathfinder rule I can find on the matter says:
"Bonuses without a type always stack, unless they are from the same source." (Core pg 208)
These aren't stacking bonuses, the bonuses are applied to different things... right?
Is my understanding correct here?
The examples you give are not giving any kind of typed or numerical bonuses so I don't think you have anything to worry about.
How about Turquoise Sphere, the one that gives your mount the Fleet feat (which is a feat that can be taken multiple times)?
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How about Turquoise Sphere, the one that gives your mount the Fleet feat (which is a feat that can be taken multiple times)?
That's .. odd. The stone is orbiting you, not your mount, so all of its effects are benefits to you, which in this case, you then apply to another creature - but I don't think that answers the question, as you, likewise, could have the Fleet feat repeatedly. I think the horse or pony would benefit from the Fleet feat multiple times, which would stack.
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Not this one. Besides, the owner of an ioun stone must deliberately activate it for herself by holding and releasing it, or must bond with it spiritually to implant it. Most mounts aren't capable of such actions. A common work-around is to set the stone in a wayfinder and put it on the creature.
Get enough of those, and sure would be a fast horse...
Get enough of those, and sure would be a fast horse...
I currently have an archer Paladin PC that I designed with the intent of getting his horse to go as fast as possible. (originally it was to use saddle surge to its fullest, but it then became an exercise in getting the horse to go as fast as possible with all movement modes)
I'm at 105ft move speed without a single Ioun Stone so far, and we have a Sorcerer with Craft Wondrous in the party. I think things may get a little silly.
There's also the question of whether the orange prism ioun stone, given that it's an untyped +1 increase to your caster level, can stack.
Untyped bonuses from the same source don't stack, so multiple Orange Prisms probably don't work. I'm not sure if bonus feats are untyped bonuses, but I suspect by extension the Turquoise Sphere probably doesn't work either... :(
Fleet specifically allows itself to stack. Feats are sources of their own, and when untyped do not stack with themselves UNLESS they specifically say they do.
The argument could be that the Orange Prism Ioun Stone is the source of the feat, and the benefit from multiple copies of that source would not then stack. Much in the way that gaining Evasion from multiple sources does not necessarily stack to gain improved evasion.