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As I understand the rules Magical items are under the same stacking rules as Combing magical effect page 206 core rule book.
Why would I want to buy a head band of vast intelligence =2 and an Ioun
that enhance my IQ also plus 2 give me no benefit.
examples:
1. If I have an Ioun stone that enhances dexterity +2 do I get nothing from a belt of enhance dexterity +2 or do I now have dx 4 enhancement?
2. is there a way around this an exception?
3. a barbarian has +2 DR from his barbarian ability
what happens when he buy an admantine breast plate? doe he now have dr4
for his troubles or is he out 10k for nothing?
4. is there anything that give a Iq bonus that is not an enhancement bonus?

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Paul,
The simplest reason i can think of, for not allowing like bonuses to stack is to prevent huge bonuses for very little gold. It gets progressively more expensive to get your stats boosted and other abilities boosted.
Perhaps one way to look at things, with your DR example, is to think of your barbarian, having a DR of 2 as a class ability, as having something for free, that would say normally cost a fighter 10,000 gold pieces by buying adamantine breast plate, to get.
I am sorry I do not know of any ability bonus that isn't an enhancement bonus.
I guess the advantage i can see of an ion stone is twofold. One one of my characters, a magus, i have purchased a belt which gives #2 to all of his physical stats, STR DEX and CON. I also have a head band of intellect on this character of +4. I also wanted to boost his wisdom, so I got a +2 Ion ion stone which boosted his wisdom.
The +2 Ion stone gave my character's wisdom a boost, with out interfering with the +4 boost to my character's intellect.
Well, I"m sorry i couldn't help with coming up with another kind of bonus,
Good luck with everything,
Elyas

awp832 |

1. You're right, these overlap, and don't stack. You would pick the highest bonus. In the case of equal bonus, your choice I guess.
2. No, there isn't. Except I suppose, for getting bonuses of different types that therefore would stack. I suppose there are some exceptions, size bonuses stack. Dodge bonuses stack. Enhancement bonuses are never going to stack.
3. Not sure about this one. I'm inclined to say that they stack. I have no evidence to support that.
4. Sure, you could get an inherent bonus to INT such as from the Tome of Clear Thought.. You get untyped bonuses to a stat of your choice every 4 levels. You can get untyped bonuses to INT from your racial modifiers.

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1: +2 enhancement bonus, same type bonuses do not stack unless states otherwise.
2: no, use a different type of bonus
3: no, Damage Reduction says they dont stack. Look at it like the barb got a 10k item for free as a class feature (though it is even better than that because the barb is free to make his armor out or some other material)
4: Alchemists can take cognatogens to give an alchemical bonus (temporarily) to Int, Wishes or Tomes can increase your stats via inherent bonuses, Racial Bonuses, lvl up bonuses, better headbands give better bonuses. Those are the things I can think up off the top of my head.
Why would you want to buy two items which give the same type of bonus? You wouldn't.

downerbeautiful |

Why would I want to buy a head band of vast intelligence =2 and an Ioun that enhance my IQ also plus 2 give me no benefit.
You actually have two questions here that merged into one sentence.
While I'm sure there's a more technical answer here, stacking bonuses isn't as simple as 2+2=4 for the price of two +2 enhancements. Remember +4 stat bonuses don't cost 8k; there's more "magic" involved. Ioun stones don't necessarily even stack with one another. Since they're typed as the same, unstacking bonus, it's so that you don't get super powerful on the cheap.1. If I have an Ioun stone that enhances dexterity +2 do I get nothing from a belt of enhance dexterity +2 or do I now have dx 4 enhancement?
You have a +2 enhancement bonus to dex
2. is there a way around this an exception?
There are stackable ioun stones for 24k a piece. They stack up to a +6 bonus. They don't stack with the belt, so you can't get 72k of the ioun stones to stack with 36k of the belt. You could also be a transmuter wizard or a barbarian. They give you bonuses.
3. a barbarian has +2 DR from his barbarian ability what happens when he buy an admantine breast plate? doe he now have dr4 for his troubles or is he out 10k for nothing?
They don't stack, and a barbarian would know this. He wouldn't drop 10k on adamantine armor.
4. is there anything that give a Iq bonus that is not an enhancement bonus?
Leveling. Also transmuter wizard. And lore oracle. Those expensive books you buy give you inherent bonuses. For dex, urban barbarian gives you controlled rage, should you want a +4 bonus to dex, con, or str.

Darksol the Painbringer |

As I understand the rules Magical items are under the same stacking rules as Combing magical effect page 206 core rule book.
Why would I want to buy a head band of vast intelligence =2 and an Ioun
that enhance my IQ also plus 2 give me no benefit.
examples:
1. If I have an Ioun stone that enhances dexterity +2 do I get nothing from a belt of enhance dexterity +2 or do I now have dx 4 enhancement?
2. is there a way around this an exception?
3. a barbarian has +2 DR from his barbarian ability
what happens when he buy an admantine breast plate? doe he now have dr4
for his troubles or is he out 10k for nothing?
4. is there anything that give a Iq bonus that is not an enhancement bonus?
1. Bonuses of the same type and amount do not stack unless they state otherwise; Dodge Bonuses to AC are an example and exception to this general rule. This is most likely allowed to help prevent lower-level powercreep. (Also, don't forget, if you can have a total of +4 with 2 +2 items, so can the bad guys.)
2. Again, unless it says you can stack them, no. By strict RAW, not really. You're welcome to try and invent an item that gives a separate bonus to a stat, but it will need GM approval. (Otherwise, you break the game.)
3. Stacking DR can be doable, but it's very confusing. The rules for it are cut and dry though; firstly, DR that is same type and amount do not stack. Secondly, DR that is different type, but same amount, does stack, and requires that both types be applicable to a given weapon attack in order for it to bypass DR. (For example, a creature with DR 5/Good and DR 5/Adamantine would be treated as having DR 5/Good and Adamantine.) Thirdly, DR that is the same type, but different amount, only the higher one of the two values is used; the other is discarded and not applicable (unless the higher value is nullified in some manner, in which case the lesser value can apply).
4. I'm not sure what an IQ bonus is...I can assume it's either an Intelligence Bonus or an Inherent Bonus. For Intelligence Bonuses, not really. There are some methods; for example, Wish spells can give enhanced intelligence that stacks with all others (though caps at a certain amount I believe), and Tomes accomplish this same thing. Another is to permanently bind a Succubus to your service and you receive a +2 Profane Bonus to a statistic, though this has several costs that you may not want to deal with...
To be honest, having all of these +2 items helps with splitting values and itemization between your gear. You'd like to have a +2 Headband for Intelligence, but you might want a Headband that grants a different effect; the Ioun Stone would still give you the +2 Headband you need while also giving you the Headband that grants the other desired effect.

Archaeik |
Scroll down to Bonus
There's a list of the different types.
4.Well, I'm assuming you also mean "easily attainable". The answer to that is no.
Here's a post about maximum ability scores. It seems largely accurate.
Specifically, ways to increase int:
Start as a race with a large boost to int
Inherent bonuses (expensive)
Levels (every 4th hit die)
Dragon Disciple 8
Alchemist 20 (also cognotogens as mentioned by someone else)
I think it also matters why you want a boost to whatever stat. There are lots of items that will grant a bonus to specific things that a stat can affect.
Like weapons get their own enhancement bonuses to attack and damage on top of your bonuses to Str/Dex.
Pearls of power let you regain spell slots.
Some items can increase caster level or spell DC.