Damage over time
Damage over time (DoT) refers to damage inflicted continuously over a period of time. Unlike the other three damage sources, damage over time does not hit.
Properties
Separate applications of the same damage over time effect do not stack cumulatively. While several damage over time effects of the same type may be applied to a target at the same time, only the one with the highest damage per second may take effect at any given time; this is true even in the case of effects applied by different players or sources. For example, if two players each apply the Ignite status ailment to the same target, only the higher damage per second of the two Ignites will affect the target, at least until the higher fades and leaves the second Ignite to become the new highest. In this context, two damage over time effects are to be considered the same only if they have the same name; a target may be affected by multiple effects that deal burning damage (such as Module Error: Too many skills found with q_where = skill.active_skill_name="Righteous Fire". Please choose only one of the following ids:
MonsterRighteousFireDemonBoss - Deals (1.9-647.8) Base Fire Damage per second, Base radius is 1.8 metres (page)
WickerManRighteousFireBlight - Deals 1.3 Base Fire Damage per second, Base radius is 1.8 metres (page), Ignite and burning ground) and also by multiple effects that deal chaos damage over time (such as Poison and desecrated ground).
In case of an enemy being killed by damage over time while being affected by multiple DoT effects, the kill is attributed to the owner of the effect that was inflicted first[1].
Damage Scaling
For purposes of modifiers, damage over time is tagged with the following:[2]
- Damage over time
- Damage type (physical, fire...)
- Delivery system (projectile, area...)
- Source (minion, trap...)
For damage over time effects that are based on amount of damage dealt in the initial hit, damage type, delivery and source modifiers which were already applied to initial hit will be applied again to the DoT.
However, damage over time is not:
- Spell damage
- Attack damage
- Weapon damage
- Melee damage
Modifiers specific to those types will not natively apply unless specifically stated so, as observed on skills like Module Error: Too many skills found with q_where = skill.active_skill_name="Contagion". Please choose only one of the following ids:
ExileContagion - Deals (2.5-149.8) Base Chaos Damage per second, Base duration is 5.00 seconds, Modifiers to Spell Damage apply to this Skill's Damage Over Time effect, Base radius is 2 metres (page)
Contagion - Deals (3.5-235.9) Base Chaos Damage per second, Base duration is 5.00 seconds, Modifiers to Spell Damage apply to this Skill's Damage Over Time effect, Base radius is 1.7 metres, Spreads when affected Enemy dies (page) or Module Error: Too many skills found with q_where = skill.active_skill_name="Essence Drain". Please choose only one of the following ids:
ExileShadowEssenceDrain - Deals (3-696) to (4-1093) Chaos Damage, Deals (2.6-662.4) Base Chaos Damage per second, Base duration is 2.50 seconds, (0-15)% increased Projectile Speed, Fires 2 additional Projectiles (page)
EssenceDrainRoyale - Deals (6-82) to (9-124) Chaos Damage, Deals (20.8-285.9) Base Chaos Damage per second, Base duration is 2.00 seconds, Modifiers to Spell Damage apply to this Skill's Damage Over Time effect, Regenerate +0.30% of Debuff Damage as Life (page). Damage conversion also does not apply to damage over time.
Tampering with the duration of a damage over time effect will affect the total amount of damage dealt by it but not its damage per second. The exception to this is the "ignited enemies burn faster" mod available on Module Error: No results found for item using search term "item_name = The_Goddess_Scorned", which will 'speed up' ignites inflicted by you, increasing their damage per second at the cost of duration, leaving the total amount of damage unchanged.
Modifiers that increase damage over time will not affect the damage a character deals to himself with skills like 
Blood Rage or Module Error: Too many skills found with q_where = skill.active_skill_name="Righteous Fire". Please choose only one of the following ids:
MonsterRighteousFireDemonBoss - Deals (1.9-647.8) Base Fire Damage per second, Base radius is 1.8 metres (page)
WickerManRighteousFireBlight - Deals 1.3 Base Fire Damage per second, Base radius is 1.8 metres (page), as that particular effect is considered a part of the buff and not a part of your damage output. However, modifiers that increase/reduce "damage taken" or "damage taken from damage over time" will affect it.
Active skills
The following skills have a damage over time component:
- Blood Rage
- Module Error: Too many skills found with q_where = skill.active_skill_name="Contagion". Please choose only one of the following ids:
ExileContagion - Deals (2.5-149.8) Base Chaos Damage per second, Base duration is 5.00 seconds, Modifiers to Spell Damage apply to this Skill's Damage Over Time effect, Base radius is 2 metres (page)
Contagion - Deals (3.5-235.9) Base Chaos Damage per second, Base duration is 5.00 seconds, Modifiers to Spell Damage apply to this Skill's Damage Over Time effect, Base radius is 1.7 metres, Spreads when affected Enemy dies (page) - Module Error: Too many skills found with q_where = skill.active_skill_name="Desecrate". Please choose only one of the following ids:
ArchnemesisDesecrate - 65% increased Cast Speed, Spawns 4 corpses, Spawns corpses up to Level 100, Maximum of 25 corpses allowed (page)
TormentInstantDesecrate - 65% increased Cast Speed, Spawns 6 corpses, Spawns corpses up to Level 100, Maximum of 10 corpses allowed (page) - Module Error: Too many skills found with q_where = skill.active_skill_name="Essence Drain". Please choose only one of the following ids:
ExileShadowEssenceDrain - Deals (3-696) to (4-1093) Chaos Damage, Deals (2.6-662.4) Base Chaos Damage per second, Base duration is 2.50 seconds, (0-15)% increased Projectile Speed, Fires 2 additional Projectiles (page)
EssenceDrainRoyale - Deals (6-82) to (9-124) Chaos Damage, Deals (20.8-285.9) Base Chaos Damage per second, Base duration is 2.00 seconds, Modifiers to Spell Damage apply to this Skill's Damage Over Time effect, Regenerate +0.30% of Debuff Damage as Life (page) - Module Error: Too many skills found with q_where = skill.active_skill_name="Fire Trap". Please choose only one of the following ids:
BarrelExplosionAtlas - Deals (0-100)% more Damage, Deals (776-1752) to (1164-2628) Fire Damage, 100% more Cast Speed (page)
MonsterGroundFireSelfDaemon - Deals (2-105.4) Base Fire Damage per second, Base duration is 5.00 seconds (page) - Module Error: Too many skills found with q_where = skill.active_skill_name="Flame Dash". Please choose only one of the following ids:
FlameDashRoyale - Deals (10-147.8) Base Fire Damage per second, Base duration is 4.00 seconds, Deals (4-56) to (6-84) Fire Damage (page)
FlameDashHardMode - Deals (19.7-1738.6) Base Fire Damage per second, Base duration is 4.00 seconds, Deals (7-659) to (11-988) Fire Damage, (0-19)% increased Cooldown Recovery Rate (page) - Module Error: No skills found with q_where = skill.active_skill_name="Poison Arrow"
- Module Error: Too many skills found with q_where = skill.active_skill_name="Puncture". Please choose only one of the following ids:
MonsterPuncture - +(112-197)% more Damage with Bleeding, Causes Bleeding (page)
MonsterPunctureAtAnimationSpeedUnique - +(112-197)% more Damage with Bleeding, Causes Bleeding (page) - Module Error: Too many skills found with q_where = skill.active_skill_name="Righteous Fire". Please choose only one of the following ids:
MonsterRighteousFireDemonBoss - Deals (1.9-647.8) Base Fire Damage per second, Base radius is 1.8 metres (page)
WickerManRighteousFireBlight - Deals 1.3 Base Fire Damage per second, Base radius is 1.8 metres (page) 
Searing Bond
Summon Chaos Golem
Viper Strike
In addition, many skills are capable of igniting enemies either via a critical hit or an explicit chance to ignite and thus dealing damage over time. This includes most fire spells; attacks that have fire damage added to them; and any skill with added or converted damage to fire from the Avatar of Fire keystone, Module Error: No skills found with q_where = skill.active_skill_name="Cold to Fire", Module Error: No skills found with q_where = skill.active_skill_name="Added Fire Damage", or other sources.
Passive skills
References
- ↑ Posted by Mark_GGG in Multiple DoTs and IIR/IIQ gems on February 18, 2014 11:16 PM
- ↑ Posted by Mark_GGG in Minion damage + ignite double scale? on August 4, 2014 1:18 AM