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(Adding spell resistance to "not stack" list.)
(Moving spells (sources of effects) out of the list of types of effects)
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'''Stacking''' is the concept where more than one instance of the same type of effect is '''cumulative''', possibly up to a cap. The rules that determine when things stack are somewhat haphazard, with many exceptions. Some of these take into consideration the source of an effect.
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'''Stacking''' is the concept where more than one instance of the same type of effect is cumulative, possibly up to a cap. The rules that determine when things stack are somewhat haphazard, with many exceptions. Some of these take into consideration the source of an effect, while most are based on the type of effect.
   
Examples of things which '''do''' stack:
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The major rule considering the source of effects involves [[spell]]s. Spells do not stack with themselves, but might stack with different spells, with few exceptions (as noted in the individual spell articles).
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That is, multiple castings of the same spell — such as ''[[bull's strength]]'' — will provide only the largest bonus of each individual casting.
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However, different spells — such as ''[[owl's wisdom]]'' and ''[[owl's insight]]'' — usually stack if they provide a type of effect that normally stacks.
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This leads to a peculiarity with some [[feat]]s that mimic spells, as those feats are typically their own spells as far as the game engine is concerned. (For example, the ''bull's strength'' spell and the [[bull's strength (feat)|bull's strength feat]] are technically different spells, so they stack.)
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When the effects in question come from different spells or from non-spells, the determination of whether or not they stack often depends on the type of effect.
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Examples of things that '''do''' stack:
 
*[[Ability]] score bonuses stack up to +12.
 
*[[Ability]] score bonuses stack up to +12.
 
*[[Armor class]] bonuses of different types stack.
 
*[[Armor class]] bonuses of different types stack.
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*[[Skill]] bonuses stack up to +50.
 
*[[Skill]] bonuses stack up to +50.
 
*Damage [[immunity]] stacks.
 
*Damage [[immunity]] stacks.
When the above bonuses come from spells, the bonuses stack if they come from different spells. (So the wisdom bonuses from [[owl's wisdom]] and [[owl's insight]] stack.)
 
   
Examples of things which '''do not''' stack:
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Examples of things that '''do not''' stack:
 
*[[Armor class]] bonuses of the same type, other than dodge, do not stack.
 
*[[Armor class]] bonuses of the same type, other than dodge, do not stack.
*Multiple uses of the same spell, such as [[bull's strength]], do not stack (but the spell does stack with the [[bull's strength (feat)|bull's strength feat]] as those are technically different spells).
 
 
*[[Concealment]] does not stack.
 
*[[Concealment]] does not stack.
 
*[[Damage reduction]] does not stack.
 
*[[Damage reduction]] does not stack.
*[[Damage resistance]] against the same type of damage does not stack (except for resistance from feats).
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*[[Damage resistance]] does not stack (except for resistance from feats).
 
*[[Spell resistance]] does not stack.
 
*[[Spell resistance]] does not stack.
   

Revision as of 00:48, April 14, 2010

Stacking is the concept where more than one instance of the same type of effect is cumulative, possibly up to a cap. The rules that determine when things stack are somewhat haphazard, with many exceptions. Some of these take into consideration the source of an effect, while most are based on the type of effect.

The major rule considering the source of effects involves spells. Spells do not stack with themselves, but might stack with different spells, with few exceptions (as noted in the individual spell articles). That is, multiple castings of the same spell — such as bull's strength — will provide only the largest bonus of each individual casting. However, different spells — such as owl's wisdom and owl's insight — usually stack if they provide a type of effect that normally stacks. This leads to a peculiarity with some feats that mimic spells, as those feats are typically their own spells as far as the game engine is concerned. (For example, the bull's strength spell and the bull's strength feat are technically different spells, so they stack.)

When the effects in question come from different spells or from non-spells, the determination of whether or not they stack often depends on the type of effect.

Examples of things that do stack:

Examples of things that do not stack:

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