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A player says he gets both bonuses from belt of giant strength +6 and ioun stone blue rhomboid (+2 STR) because belt gives "permanent bonus."
I say this is incorrect, as both bonuses are enhancement bonuses which do not stack.
The player should only be receiving the higher of the two scores, which is +6.

Xaratherus |

Agree with Zhayne and Kazumetsa. To quote the relevant rules:
Bonuses are numerical values that are added to checks and statistical scores. Most bonuses have a type, and as a general rule, bonuses of the same type are not cumulative (do not “stack”)—only the greater bonus granted applies.
Stacking refers to the act of adding together bonuses or penalties that apply to one particular check or statistic. Generally speaking, most bonuses of the same type do not stack. Instead, only the highest bonus applies. Most penalties do stack, meaning that their values are added together. Penalties and bonuses generally stack with one another, meaning that the penalties might negate or exceed part or all of the bonuses, and vice versa.
So it does not matter if you have 12 different sources of a permanent enhancement bonus to an ability score - you only get the highest of the 12 because bonuses of the same type (with a few exceptions, such as dodge, circumstance, and 'untyped' bonuses) do not stack.

Snowleopard |

And the theoretical situation where there is a +2 str morale bonus and a +2 strength skill nonus which would stack. Thankfully the enhancement bonusses are all from the same source: the spell that produces them in a permanent item + maximize feat + empower feat if it is a +6 bonus.
But bonusses to attacks have more different sources and often stack which each other is kewl.
And that's the reason why the spell never stacks with the permanent item. Same source of the bonus: the enhancement spell. Thankfully barbarians have strength enhancer of a different source and that stacks with a belt.

Snowleopard |

The source doesn't matter. Only the type.
I have no idea what you're talking about, Snowleopard. Empower and Maximize have no effect on Bull's Strength or any other Animal's Attribute spell.
I know.
When you make a +2 strength item. you need Bull's strengthIf you make a +4 strength item. you need Bull's strength and empower feat
If you make a +6 strength item. you need Bull's strength and both empower and maximize feat.
Off course a +5 on the skill check per missing ability is possible as well.
This also means that the spell bull's strength will not stack with a strength belt as that would be the same source for both enhancers, So untill duration runs out the strongest source will be active.
Sorry If I wasn't obvious enough

Zhayne |

Zhayne wrote:The source doesn't matter. Only the type.
I have no idea what you're talking about, Snowleopard. Empower and Maximize have no effect on Bull's Strength or any other Animal's Attribute spell.
If you make a +4 strength item. you need Bull's strength and empower feat
If you make a +6 strength item. you need Bull's strength and both empower and maximize feat.
No, you don't.

Majuba |

Zhayne wrote:The source doesn't matter. Only the type.
I have no idea what you're talking about, Snowleopard. Empower and Maximize have no effect on Bull's Strength or any other Animal's Attribute spell.
I know.
When you make a +2 strength item. you need Bull's strength
If you make a +4 strength item. you need Bull's strength and empower feat
If you make a +6 strength item. you need Bull's strength and both empower and maximize feat.
Off course a +5 on the skill check per missing ability is possible as well.
This also means that the spell bull's strength will not stack with a strength belt as that would be the same source for both enhancers, So untill duration runs out the strongest source will be active.
Sorry If I wasn't obvious enough
Sounds like you had an interesting and detailed houserule.

Snowleopard |
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I have been checking again to see where I got that idea from. But not even the 3.0 rules had a different description. I have no idea where I got that from, but I would have sworn the enhanced versions of ability enhancing items needed feats like empower and maximise. Sorry for causing the confusion.