A passive effect is an effect that is applied as a part of a larger action, or is present throughout the game. They grant added bonuses, some of which directly increase base stats, and may require activation or a condition to be met.

Acquisition

There are currently three different ways to acquire passive effects in the game. The first is from champion abilities. Each innate ability has a passive effect, but some champions have an additional ability (or abilities) that grants a boost passively (ex. SonaSquare Sona's Crescendo Crescendo).

The second source is from items. When purchased, these items will grant the wearer increased stats and effects while owned. These passive effects may change as through the build path, but usually remain consistent (ex. Zeal item Zeal).

The third source is from global map effects. These include the Crystal Scar (Dominion) Proving Grounds (ARAM) the Twisted Treeline altar buffs, and the URF Mode buff. This passive effect applies to all players from the start to the end of the game.

Types

There are several different types of passive effects, aside from the usual defensive, offensive or utility. These mainly are:

Constant passives

These effects are persistent throughout the game no matter what action is taken. They include innate abilities, and both Crystal Scar and Proving Grounds passive bonuses.

Restrained passives

These are in effect until a certain action is taken that temporarily disables them.

Stacking passives

These passives have an effect which increases each time a certain action is performed.

Aura passives

These passives have a small area of effect that affect allies and or foes.

Buffing passives

These passives increase stats such as On-hit effect.

De-buffing passives

These passives reduce stats such as attack speed.