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.

Examples of things which do stack:

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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