Damage over time
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Damage over time (DoT) refers to damage inflicted continuously over a period of time. This is contrasted with hits of damage, which take effect instantly.
Common forms of damage over time are:
- Fire damage in the form of burning
- Chaos damage in the form of poison and
Viper Strike - Physical damage in the form of bleed and Corrupting Blood nemesis affix
Separate applications of the same kind of damage over time effect do not stack cumulatively. While several of the same kind of damage over time effect 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 kinds of 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) and Ignite) and also by multiple kinds of poison damage (such as Adder's Touch and Module Error: No skills found with q_where = skill.active_skill_name="Poison Arrow").
For purposes of modifiers, damage over time is tagged with the following:[1]
- Damage over time
- Damage type (physical, fire...)
- Delivery system (projectile, area...)
- Source (minion, trap...)
When the base amount of the damage over time is determined by an initial hit, damage type and source modifiers may apply to both the initial hit and the damage over time.
Damage over time is not:
- Spell damage
- Attack damage
- Weapon damage
- Melee damage
- Ranged damage
Modifiers specific to those types will not apply. Damage conversion does not apply to damage over time.
Modifiers that increase damage over time will not affect the damage a character deals to himself. For example, allocating the Entropy passive will not cause the character to take increased damage from 
Blood Rage.
Active skills
The following skills have a damage over time component:
- 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: No skills found with q_where = skill.active_skill_name="Poison Arrow"
- Viper Strike
- Blood Rage
- 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) - 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) 
Searing Bond- 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)
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.