Secondary damage

Secondary damage is a damage source that is not attack damage, spell damage, or damage over time. It hits.

Mechanics

Secondary damage is a hit that isn't spell or attack damage. It is most commonly dealt by explosions and self-damage.

Secondary damage dealt to enemies is affected by damage modifiers that aren't limited to spell or attack damage. For example, Detonate DeadDetonate DeadSpell, AoE, Fire
Level: (1-20)
Cost: (5-20) Mana
Cast Time: 0.60 sec
Critical Strike Chance: 6.00%
Effectiveness of Added Damage: 160%
AoE Radius: 22Requires Level 4Targets a corpse, and deals spell damage to enemies around the corpse, as well as causing the corpse to explode, dealing fire damage. The explosion is not affected by modifiers to spell damage and cannot be reflected.Deals (15-798) to (22-1197) Fire Damage
Explosion deals base Fire Damage equal to (6-7.9)% of the corpse's Maximum Life
Base radius is (2.2-2.6) metres

Additional Effects From 1-20% Quality:
(0.75-15)% chance to detonate an additional corpsePlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.'s corpse explosion is scaled by area damage and fire damage, but not by spell damage.

Defensively, it is mitigated like other hits. When secondary damage originates from spells or attacks, it can be blocked, dodged, suppressed, or evaded like attack or spell damage.^[1] (Self-damage from spells or attacks such as Forbidden RiteForbidden RiteSpell, AoE, Chaos, Projectile
Level: (1-20)
Cost: (8-21) Mana
Cast Time: 0.75 sec
Critical Strike Chance: 6.00%
Effectiveness of Added Damage: 110%Requires Level 16Lobs an exploding projectile near the targeted location, and extra projectiles toward enemies around you. The projectiles deal chaos damage based on your life and energy shield. Casting this spell damages you.Deals (15-498) to (22-747) Chaos Damage
Deals 5% of your maximum Energy Shield as base Chaos Damage
Deals 12% of your maximum Life as base Chaos Damage
Take 40% of maximum Life and 25% of maximum Energy Shield as Chaos Damage
Fires extra Projectiles at up to (6-7) surrounding Enemies

Additional Effects From 1-20% Quality:
Fires extra Projectiles at up to +(0.1-2) surrounding EnemiesPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket. and BoneshatterBoneshatterAttack, Melee, Strike, AoE, Duration, Physical
Level: (1-20)
Cost: 5 Mana
Attack Speed: 85% of base
Attack Damage: (200-250)% of base
Effectiveness of Added Damage: (200-250)%Requires Level 28Attack enemies with a forceful melee strike that also hurts you. Successive uses will raise the damage dealt both to enemies and you. Stunning an enemy with the strike releases a damaging pulse. Requires a Mace, Sceptre, Axe or Staff.(11-158) to (17-238) Added Attack Physical Damage
+0.2 metres to Melee Strike Range
Gain 1 Trauma the first time this Attack Hits an Enemy
Take (6-194) Physical Damage per Trauma when you gain Trauma
Trauma lasts 6.0 seconds
(2-4)% more Damage per Trauma
Pulse has 15% increased Area of Effect per 0.1s of Stun Duration, up to 400%

Additional Effects From 1-20% Quality:
+(0.05-1)% more Damage per TraumaPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket. cannot.)

Secondary damage can be reflected, though explosions cannot. Herald of ThunderHerald of ThunderSpell, AoE, Duration, Lightning, Herald
Level: (1-20)
Reservation: 25% Mana
Cooldown Time: 1.00 sec
Can Store 1 Use(s)
Cast Time: Instant
AoE Radius: 32Requires Level 16Grants a buff which adds lightning damage to spells and attacks. If you kill a shocked enemy, this skill will create a storm, causing lightning bolts to strike enemies around you for a duration. The damage inflicted by this skill is not affected by modifiers to spell damage.Deals (1-23) to (31-1108) Lightning Damage
Cannot inflict Shock
Base duration is 6.00 seconds
Storm Hits an Enemy every 0.25 Seconds
Creates a storm when you Kill a Shocked Enemy
Buff grants (2-19) to (7-76) Added Attack Lightning Damage
Buff grants (2-19) to (7-76) Added Spell Lightning Damage

Additional Effects From 1-20% Quality:
Storms Hit Enemies with (1-20)% increased FrequencyPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket. is a rare form of secondary damage susceptible to damage reflection.

Skill gems

The following skills have a secondary damage component:

Gem
Bear TrapBear TrapTrap, Spell, Duration, Physical Level: (1-20) Cost: (6-23) Mana Cooldown Time: 4.00 sec Can Store 3 Use(s) Cast Time: 1.00 sec Critical Strike Chance: 6.00% Effectiveness of Added Damage: 300%Requires Level 4Throws a trap that damages and immobilises a single enemy for a duration based on how much damage was dealt. After the immobilise expires, a debuff remains on the enemy for a duration, lowering their movement speed by an amount which lessens over time. The affected enemy will take increased damage from traps and mines until the debuff expires. Modifiers to spell damage do not affect this skill's damage.Deals (16-1447) to (22-2026) Physical Damage Traps do not Trigger at the end of their Duration Trap lasts 4 seconds Base duration is 3.00 seconds Locks enemy in place Enemies take 25% increased Damage from Trap or Mine Hits Enemies have 80% less Movement Speed when the Debuff starts Additional Effects From 1-20% Quality: Base duration is (0.05-1) secondsPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.	4	N/A		N/A
Bear Trap of SkewersBear Trap of SkewersTrap, Spell, Duration, Physical Level: (1-20) Cost: (6-23) Mana Cooldown Time: 4.00 sec Can Store 3 Use(s) Cast Time: 1.00 sec Critical Strike Chance: 6.00% Effectiveness of Added Damage: 150%Requires Level 4Throws a trap that damages and impales a single enemy, and immobilises them for a duration based on how much damage was dealt. Modifiers to spell damage do not affect this skill's damage.Deals (8-711) to (11-995) Physical Damage Traps do not Trigger at the end of their Duration Trap lasts 4 seconds Locks enemy in place Killing Blows cause Impales on Enemies to Reflect Damage to surrounding Enemies (100-195)% increased Impale Effect Impale Enemies on Hit Additional Effects From 1-20% Quality: (4-80)% increased Impale EffectPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.	4	N/A		N/A
CremationCremationSpell, AoE, Fire, Duration, Projectile, Orb Level: (1-20) Cost: (11-20) Mana Cast Time: 0.60 sec Critical Strike Chance: 5.00%Requires Level 28A targeted corpse explodes, dealing area damage and turning into a volcanic geyser, which will repeatedly unleash projectiles sequentially over the surrounding area for a duration. The explosion of the corpse is not affected by modifiers to spell damage, and cannot be reflected.Fires Projectiles every 1.0 seconds Base duration is 8.00 seconds Deals (49-434) to (74-651) Fire Damage Fires 4 Projectiles Explosion deals base Fire Damage equal to (4-5)% of the corpse's Maximum Life Maximum of 3 Geysers at a time +(0-0.3) metres to radius Additional Effects From 1-20% Quality: Fires Projectiles (0.5-10)% fasterPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.	28	N/A
Cremation of ExhumingCremation of ExhumingSpell, AoE, Fire, Duration, Projectile, Orb Level: (1-20) Cost: (14-26) Mana Cast Time: 0.80 sec Critical Strike Chance: 5.00%Requires Level 28A targeted corpse explodes, dealing area damage and turning into a volcanic geyser, which will repeatedly unleash projectiles sequentially over the surrounding area and detonate nearby corpses for a duration. Corpse explosions are not affected by modifiers to spell damage, and cannot be reflected.Fires Projectiles every 1.0 seconds Base duration is 8.00 seconds Deals (49-434) to (74-651) Fire Damage Fires 4 Projectiles Explosion deals base Fire Damage equal to (5-6)% of the corpse's Maximum Life Maximum of 1 Geysers at a time +(0-0.3) metres to radius Explode a nearby Corpse when Firing Projectiles Additional Effects From 1-20% Quality: Fires Projectiles (0.5-10)% fasterPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.	28	N/A
Detonate DeadDetonate DeadSpell, AoE, Fire Level: (1-20) Cost: (5-20) Mana Cast Time: 0.60 sec Critical Strike Chance: 6.00% Effectiveness of Added Damage: 160% AoE Radius: 22Requires Level 4Targets a corpse, and deals spell damage to enemies around the corpse, as well as causing the corpse to explode, dealing fire damage. The explosion is not affected by modifiers to spell damage and cannot be reflected.Deals (15-798) to (22-1197) Fire Damage Explosion deals base Fire Damage equal to (6-7.9)% of the corpse's Maximum Life Base radius is (2.2-2.6) metres Additional Effects From 1-20% Quality: (0.75-15)% chance to detonate an additional corpsePlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.	4	N/A
Detonate Dead of Chain ReactionDetonate Dead of Chain ReactionSpell, AoE, Fire Level: (1-20) Cost: (7-27) Mana Cast Time: 0.80 sec Critical Strike Chance: 6.00%Requires Level 4Targets a corpse, and deals spell damage to enemies around the corpse, as well as causing the corpse to explode, dealing fire damage. The explosion is not affected by modifiers to spell damage and cannot be reflected. This will continue to target other corpses in the area, with a shorter delay between each one, until it runs out of corpses or has destroyed 8 corpses. Cannot be supported by Spell Cascade.Deals (9-469) to (13-704) Fire Damage Explosion deals base Fire Damage equal to (4-5)% of the corpse's Maximum Life Base radius is (2-2.4) metres Additional Effects From 1-20% Quality: Base radius is (0.01-0.2) metresPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.	4	N/A
Detonate Dead of ScavengingDetonate Dead of ScavengingSpell, AoE, Fire Level: (1-20) Cost: (5-20) Mana Cast Time: 0.60 sec Critical Strike Chance: 6.00%Requires Level 4Targets a corpse, causing it to explode, dealing fire damage. The explosion is not affected by modifiers to spell damage and cannot be reflected. Cannot target corpses that have been created by skills.Explosion deals base Fire Damage equal to (20-29.5)% of the corpse's Maximum Life 60% less Damage with Ailments Base radius is (2.8-3.2) metres Additional Effects From 1-20% Quality: Explosion deals base Fire Damage equal to (0.25-5)% of the corpse's Maximum LifePlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.	4	N/A
Herald of IceHerald of IceSpell, AoE, Cold, Herald Level: (1-20) Reservation: 25% Mana Cooldown Time: 1.00 sec Can Store 1 Use(s) Cast Time: Instant Effectiveness of Added Damage: 80%Requires Level 16Grants a buff adding cold damage to spells and attacks. If you shatter an enemy, this skill will cause them to explode and deal AoE cold damage to enemies near them. This damage is not affected by modifiers to spell damage.Deals (18-308) to (26-462) Cold Damage Damage cannot be Reflected Base radius is 1.2 metres Buff grants (4-38) to (5-56) Added Attack Cold Damage Buff grants (4-38) to (5-56) Added Spell Cold Damage Additional Effects From 1-20% Quality: +(0.01-0.2) metres to radiusPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.	16	N/A
Vaal Detonate DeadVaal Detonate DeadSpell, AoE, Vaal, Fire Level: (1-20) Souls Per Use: 30 Can Store 1 Use(s) Soul Gain Prevention: 8 sec Cast Time: 0.60 sec Critical Strike Chance: 5.00% Effectiveness of Added Damage: 200%Requires Level 4Targets a corpse, and deals spell damage to enemies around the corpse, as well as causing the corpse to explode, dealing fire damage. The explosion is not affected by modifiers to spell damage and cannot be reflected. This will continue to target other corpses in the area, with an increasing delay between each one, until it runs out of corpses or has destroyed 22 corpses.Deals (23-1395) to (33-2092) Fire Damage Explosion deals base Fire Damage equal to (6-7.9)% of the corpse's Maximum Life Base radius is (2.4-2.8) metres Additional Effects From 1-20% Quality: (1.5-30)% chance to detonate an additional corpseCorruptedPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.	4	N/A
Volatile DeadVolatile DeadSpell, AoE, Fire Level: (1-20) Cost: (9-26) Mana Cast Time: 0.80 sec Critical Strike Chance: 5.00% Effectiveness of Added Damage: 170%Requires Level 12Corpses near the targeted location explode, dealing damage in a small area and creating an orb which moves towards nearby enemies before dealing spell damage in a larger area. The explosion of the corpse is not affected by modifiers to spell damage, and cannot be reflected.Deals (20-753) to (30-1129) Fire Damage Explosion deals base Fire Damage equal to (3-4)% of the corpse's Maximum Life Consumes up to 3 corpses Base radius is 2 metres Base explosion radius is 1.5 metres Maximum of 60 Orbs at a time Additional Effects From 1-20% Quality: (2-40)% increased Orb Movement SpeedPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.	12	N/A
Volatile Dead of ConfinementVolatile Dead of ConfinementSpell, AoE, Fire, Duration Level: (1-20) Cost: (9-26) Mana Cast Time: 0.80 sec Critical Strike Chance: 5.00% Effectiveness of Added Damage: 210%Requires Level 12Corpses near the targeted location explode, dealing damage in a small area and creating an orb which detonates after a duration, dealing spell damage in a larger area. The explosion of the corpse is not affected by modifiers to spell damage, and cannot be reflected.Base duration is 1.50 seconds Deals (25-938) to (37-1407) Fire Damage Explosion deals base Fire Damage equal to (3-4)% of the corpse's Maximum Life Consumes up to 3 corpses Base radius is 2.8 metres Base explosion radius is 1.5 metres Maximum of 60 Orbs at a time Additional Effects From 1-20% Quality: Base radius is (0.015-0.3) metresPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.	12	N/A
Volatile Dead of SeethingVolatile Dead of SeethingSpell, AoE, Fire Level: (1-20) Cost: (9-26) Mana Cast Time: 0.80 sec Critical Strike Chance: 5.00% Effectiveness of Added Damage: 170%Requires Level 12Corpses near the targeted location explode, dealing damage in a small area and creating an orb which moves towards nearby enemies before dealing spell damage in a larger area. The explosion of the corpse is not affected by modifiers to spell damage, and cannot be reflected.Deals (20-753) to (30-1129) Fire Damage Explosion deals base Fire Damage equal to (3-4)% of the corpse's Maximum Life Consumes up to 10 corpses Base radius is 2 metres Base explosion radius is 1.5 metres Maximum of 10 Orbs at a time Additional Effects From 1-20% Quality: (2-40)% increased Orb Movement SpeedPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.	12	N/A
BodyswapBodyswapMovement, Spell, AoE, Fire, Travel Level: (1-20) Cost: (8-23) Mana Cast Time: 0.70 sec Critical Strike Chance: 6.00%Requires Level 10Violently destroys your body and recreates it at the location of a targeted enemy or corpse, dealing spell damage in an area at both locations. If there is no specific target, it will prioritise corpses over enemies. If targeting a corpse, the corpse will also explode, dealing damage around it that is not affected by modifiers to spell damage, and cannot be reflected. This spell cannot be repeated.This Spell deals (3-210) to (5-315), plus 4% of your maximum Life, as base Fire Damage Explosion deals base Fire Damage equal to (6-7.9)% of the corpse's Maximum Life +(0-0.2) metres to radius 200% more Area of Effect if Consuming a corpse Additional Effects From 1-20% Quality: Deals +(0.2-4)% of your maximum Life, as base Fire DamagePlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.	10	N/A
Herald of ThunderHerald of ThunderSpell, AoE, Duration, Lightning, Herald Level: (1-20) Reservation: 25% Mana Cooldown Time: 1.00 sec Can Store 1 Use(s) Cast Time: Instant AoE Radius: 32Requires Level 16Grants a buff which adds lightning damage to spells and attacks. If you kill a shocked enemy, this skill will create a storm, causing lightning bolts to strike enemies around you for a duration. The damage inflicted by this skill is not affected by modifiers to spell damage.Deals (1-23) to (31-1108) Lightning Damage Cannot inflict Shock Base duration is 6.00 seconds Storm Hits an Enemy every 0.25 Seconds Creates a storm when you Kill a Shocked Enemy Buff grants (2-19) to (7-76) Added Attack Lightning Damage Buff grants (2-19) to (7-76) Added Spell Lightning Damage Additional Effects From 1-20% Quality: Storms Hit Enemies with (1-20)% increased FrequencyPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.	16	N/A	N/A
Voltaxic BurstVoltaxic BurstSpell, AoE, Chaos, Lightning, Nova, Duration Level: (1-20) Cost: (6-16) Mana Cast Time: 0.50 sec Critical Strike Chance: 6.50% Effectiveness of Added Damage: 230%Requires Level 12Each cast of this spell waits for a short duration, releasing a burst of lightning and chaos spell damage in an area around you when that duration ends. Enemies killed by this damage, or shortly after, will explode. The explosions of the corpses are not affected by modifiers to spell damage, and cannot be reflected.Deals (20-906) to (38-1683) Lightning Damage Base duration is 2.50 seconds Explosion deals base Lightning Damage equal to 6% of corpse's Maximum Life +(0-0.3) metres to radius 40% of Lightning Damage Converted to Chaos Damage 1% more Damage with Hits and Ailments for each Cast of this Spell currently waiting Additional Effects From 1-20% Quality: +(0.05-1)% more Damage with Hits and Ailments for each Cast of this Spell currently waitingPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.	12	N/A
Infernal BlowInfernal BlowAttack, AoE, Melee, Strike, Fire, Duration Level: (1-20) Cost: 6 Mana Attack Damage: (104-166)% of base Effectiveness of Added Damage: (104-166)% AoE Radius: 15Requires Level 12Attacks with your weapon, applying a charged debuff to enemies hit by your strike, and an uncharged debuff to any other enemies hit. Upon reaching 6 charges, expiring, or the enemy's death, the charged debuff is removed to damage that and other surrounding enemies. Enemies with either debuff explode when they die, damaging other surrounding enemies. Damage from this explosion cannot be reflected. Requires a Sword, Axe, Mace, Sceptre, Staff or Unarmed.Base duration is 0.80 seconds (5-75) to (8-113) Added Fire Damage Explosion deals base Fire Damage equal to 6% of the corpse's Maximum Life 60% of Physical Damage Converted to Fire Damage Base radius is 2.4 metres Base explosion radius is 1.8 metres Debuff deals 66% of Damage per Charge Additional Effects From 1-20% Quality: Debuff deals +(0.5-10)% of Damage per ChargePlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.	12		N/A	N/A
Infernal CryInfernal CryWarcry, AoE, Duration, Fire, Attack, Trigger, Melee Level: (1-20) Cost: (15-19) Mana Cooldown Time: 8.00 sec Can Store 1 Use(s) Use Time: 0.80 sec AoE Radius: 60Requires Level 24Performs a warcry, taunting nearby enemies to attack the user and exerting subsequent attacks. Covers enemies in ash, causing them to move slower and take increased fire damage. Affected enemies explode when they die, dealing fire damage in an area.Base duration is (5.00-5.90) seconds (0-38)% increased Warcry Speed Damage cannot be Reflected Explosion deals Fire Damage equal to 8% of the Monster's maximum Life Counts total Power of Enemies in Range Covers Enemies in Ash, causing 3% increased Fire Damage taken per 5 Power, up to 20% Exerts the next 6 Melee Attacks you perform Exerted Attacks Trigger Combust the first time they deal a Melee Hit 60% of Physical Damage Converted to Fire Damage This Skill is Triggered by Attacks Exerted by Infernal Cry Additional Effects From 1-20% Quality: (2-40)% increased Cooldown Recovery RatePlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.	24		N/A	N/A

Sources other than gems

Explosions - All explosion damage is considered secondary damage. This includes explosions from items, ascendancy passives, keystones, and cluster jewel passives.

Explosion example: Crusader influence body armor's "Enemies you Kill Explode, dealing 3% of their Life as Physical Damage".
For more information see Explode.

Self Damaging Uniques

Some self damaging unique effects such as Heartbound LoopHeartbound Loop
Moonstone RingRequires Level 20+(15-25) to maximum Energy ShieldRegenerate (10-15) Life per second
(20-40)% increased Mana Regeneration Rate
Minions have 15% increased maximum Life
Minions have 10% increased Area of Effect
350 Physical Damage taken on Minion DeathWhen the axe finally fell, Seryl shared his pain,
and the last thought that flickered through his
fading mind was her broken, shattered scream. and Scold's BridleScold's Bridle
Mind CageEnergy Shield: (73-84)Requires Level 65, 138 Int(80-100)% increased Spell Damage
15% reduced Cast Speed
+(30-60) to maximum Mana
Your Skills deal you 400% of Mana Spent on Upfront Skill Mana Costs as Physical Damage"The sharper the pain, the sharper the mind.
A curious paradox."
- Shavronne of Umbra deal their damage to you as secondary damage. In contrast HiltlessHiltless
Reaver SwordTwo Hand Sword
Physical Damage: (152-177) to (334-364)
Critical Strike Chance: (7.00-7.50)%
Attacks per Second: 1.50
Weapon Range: 1.5 metresRequires Level 59, 82 Str, 119 Dex60% increased Global Accuracy RatingSocketed Gems are Supported by Level 1 Lifetap
Adds (90-115) to (230-260) Physical Damage
(40-50)% increased Critical Strike Chance
Enemies you Attack Reflect 100 Physical Damage to you
+0.2 metres to Weapon RangeThe cuts on my hands are a small price to pay
for the opportunity to drive my steel
beyond the flesh and into the demon's soul. deals reflected damage.