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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.

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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