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Damage over time (DoT) is a term used to describe damage from an ability or effect that is dealt over an extended period of time rather than occurring immediately. A DoT will deal damage that occurs at its individually specified intervals. An instance of damage at a given interval is known as a Tick. Ticks occur at many different rates: every second (1), every half-second (0.5), or every quarter-second (0.25), and occasionally every half of a quarter-second (0.125). All DoTs follow their own individually specified tickrate.

Damage over time can trigger spell effects, usually through the Blaze.png persistent damage or Poison Trail.png persistent area damage source type. Although some may use Umbra Blades.png periodic damage or Death Lotus.png area damage.

Types of DoTs

Target-Sourced DoTs

Target-Sourced DoTs deal damage over time using a debuff on the target that will continuously damage it for as long as it persists. This type of DoT is usually not removable once it has been applied. The debuff used to apply this type of DoT may or may not be capable of stacking but almost always is capable of being refreshed if a new instance of the debuff is applied.

Champion abilities
Items
Summoner Spells
Neutral Buffs

Tether-Sourced DoTs

Tether-Sourced DoTs are DoTs that are applied when an ability deals damage over time to any Focused Resolve.png tethered targets. If the tether breaks, the DoT is removed immediately.

Champion abilities

Area-Sourced DoTs

Area-Sourced DoTs deal damage over time to targets with a designated area. The damage stops if a target leaves the designated area; However, some DoTs use a short-duration debuff that continuously reapplies to targets inside the affected area and then lingers momentarily after a target leaves the area. There are two sub-types for this type of DoT: Location-Sourced Area DoTs and Unit-Sourced Area DoTs.

Location-Sourced Area DoTs

Location-Sourced Area DoTs deal damage to all targets within a designated location.

Champion abilities

Unit-Sourced Area DoTs

Unit-Sourced Area DoTs deal damage over time to targets within a given direction or as an aura, with the source being the unit inflicting the DoT.

Champion abilities
Items
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