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Witch Doctor

Damage Over Time (DoT) is a debuff from an ability that causes the affected unit to take damage over an extended period of time. The damage is dealt at the end of each interval, the first of which begins when the unit is affected by the ability. Some damage over time abilities have an initial damage, which may or may not be equal to the periodic damage. All damage over time abilities has its intervals hard-coded in the ability and they follow their own individually specified intervals.


A damage over time ability have several components and can be broken down into the following, each of these components can cause a range of different interactions within the game.

Components Definitions
Initial Damage Some abilities have different initial damages. For abilities that start immediately upon impact, its initial damage is the same as damage per instance.
Interval The time between instances in seconds. This value is usually hard-coded in the ability.
Damage Duration Duration from the initial damage to the last instance of damage.
Damage per Instance The total damage excluding initial damage over the interval.
Number of Intervals The damage duration over the interval.
Max Total Damage The total of the initial damage and the damage per instance multiplying its instances.


Some abilities dealing damage over time continuously damage the target with a debuff, and most debuff refreshes its duration when it is reapplied, unless noted otherwise. Depending on the damage over time debuff's expiring condition, it might last until the effect expires, it may be dispeled, or the target might not be affected anymore if they moves out of range or a certain radius. These information will be stated in the ability's notes section.

Firefly icon
No Target
Enemies / Self
Batrider takes to the skies, laying down a trail of flames from the air. The fire damages any enemies it touches, and destroys trees below Batrider.
Initial Delay: 0.1
Damage per Second: 30/60/90/120
First Interval: 0.4 (Talent 19.5)
Subsequent Intervals: 0.5
Cooldown symbol
Mana symbol
Cannot be used by illusions.
Illusion Notes:
Illusions created during Firefly do not fly.
Modifiers [?]
When an enemy escapes into the Yama Raskav Jungle, most would cut through the brush to find the fugitive. Batrider just chooses to destroy the jungle along with his foes.

  • Damage is dealt to every enemy unit which comes within radius of the fire trail.
  • Deals 15/30/45/60 damage per interval, starting 0.1 seconds after cast, the first interval is 0.4 seconds, the rest are 0.5 seconds, resulting in Expression error: Unexpected / operator. (Talent Expression error: Unexpected / operator.) damage instances.
    • Can deal up to 15/30/45/60 (Talent 15/30/45/60) damage to a single unit (before reductions) when the affected unit stays in range for the full duration.
  • The fire trails from successive casts fully stack. Each cast creates its buff with its own fire trail.
  • When Batrider dies during Firefly, the already existing fire on the ground still stays for the remaining duration.
    • The buffs remain visible in the HUD, and are now only responsible for keeping the already existing fire up.
    • This means when respawning before they expire, they do not make Batrider fly again or make him leave fire behind again.
  •  /  Ability effects persist upon losing ability.

Damage Over Time Sources[]

Damage Over Time Sources
1 Requires Talent talent.
2a Requires Aghanim's Scepter icon Aghanim's Scepter.
2b Requires Aghanim's Shard icon Aghanim's Shard.

Fixed Attack Interval[]

Main Article: Fixed Attack Interval

Abilities that perform instant attacks or attacks based on fixed intervals and they completely ignore the base attack time, attack speed and attack rate of the unit. Although these abilities deal damage in between intervals, they are not considered as damage over time abilities.