AURA

An "aura" is some sort of special behavior or effect that is either placed on a creature or an object. Auras can affect a creatures statistics or behavior. A creature is affected by any auras that are directly placed on it and from any auras that are on items that it is equipping.

Auras can be as simple as "+2 to hit" or as complex as "lycanthropy".

Some auras, like auras from spells, have a limited duration while other auras, like trait or feat auras, are usually permanent.

Auras can also be hidden or visible. An aura that is hidden will usually be undetectable by someone who has that aura.