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▶️ That harms me not.
Abaddon

Damage manipulation is a mechanic that alters damage values, either increasing or reducing it. Damage can be manipulated on both ends, from the dealing unit (outgoing damage) and the receiving unit (incoming damage). Armor and magic resistance are the most common damage manipulators, affecting incoming physical and magical damage respectively. Besides armor and magic resistance, a general damage manipulator exists, which is used by almost all other sources of damage manipulation. This manipulator is more flexible, and can amplify or reduce any kind of damage and may affect attack damage, spell damage, or both at the same time.

Generic Damage Manipulator[]

The generic damage manipulator is divided into incoming and outgoing damage manipulation, which results in them stacking multiplicatively. Most abilities that affect damage use the generic damage manipulator.

Incoming Damage[]

Incoming damage manipulation causes the afflicted unit to take increased or reduced damage. All sources within these lists stack additively with each other.

Armor and magic resistance work with incoming damage as well, but are handled separately and not by the generic damage manipulator. This results in them stacking multiplicatively with the general damage manipulator.

Incoming Damage Amplifiers
Incoming Damage Reducers
  • Aeon Disk icon.png
    Damage Reduction: 100%
    Duration: 2.5
    Reduces all damage the hero takes while the effect is active.
  • Shadow Walk icon.png
    Damage Reduction: Upgradable by Aghanim's Shard. 35%
    Requires Aghanim's Shard icon.png Aghanim's Shard Reduces all damage Bounty Hunter takes while invisible.
  • Bristleback ability icon.png
    Rear Damage Reduction: 16%/24%/32%/40%
    Side Damage Reduction: 8%/12%/16%/20%
    Reduces all damage Bristleback takes from certain angles.
  • Backdoor Protection icon.png
    Damage Reduction: 50%
    Protected Illusion Damage Reduction: 75%
    Reduces all damage the building takes while protected, reducing more from illusions.
  • Stampede icon.png
    Damage Reduction: Upgradable by Aghanim's Scepter. 40%
    Duration: 3.5/4/4.5 (Upgradable by Aghanim's Scepter. 4.5/5/5.5)
    Requires Aghanim's Scepter icon.png Aghanim's Scepter. Reduces all damage buffed allies take.
  • Duel icon.png
    Damage Reduction: Upgradable by Aghanim's Scepter. 50%
    Duration: 4/4.75/5.5 (Upgradable by Aghanim's Scepter. 6/7/8)
    Requires Aghanim's Scepter icon.png Aghanim's Scepter. Reduces all damage the duellists take from all sources except each other.
  • Frost Shield icon.png
    Damage Reduction: 30%/40%/50%/60% (Talent 40%/50%/60%/70%)
    Duration: 6 (Talent 10)
    Reduces all attack damage the buffed unit takes. Does not affect spell damage.
  • Bulwark icon.png
    Front Damage Reduction: 40%/50%/60%/70% (Talent 50%/60%/70%/80%)
    Side Damage Reduction: 20%/25%/30%/35% (Talent 25%/30%/35%/40%)
    Reduces all damage Mars takes from certain angles, using the same targeting rules as damage block. This means it reacts on attacks and on a small selection of abilities.
  • Burrow icon.png
    Damage Reduction: 50%
    Requires Aghanim's Scepter icon.png Aghanim's Scepter to unlock. Reduces all damage Nyx Assassin takes while burrowed.
  • Shield Crash icon.png
    Damage Reduction per hero: 15%/16%/17%/18%
    Duration: 5/7/9/11
    Reduces all damage Pangolier takes based on the number of stacks.
  • Dispersion icon.png
    Damage Reduction: 8%/12%/16%/20% (Talent 13%/17%/21%/25%)
    Passively reduces all damage Spectre takes.
  • Enrage icon.png
    Damage Reduction: 80%
    Duration: 4/4.5/5
    Reduces all damage Ursa takes while buffed.
  • Gravekeeper's Cloak icon.png
    Max Layers: 4 (Talent 9)
    Damage Reduction per Layer: 8%/12%/16%/20%
    Damage Reduction Cap: 80%
    Layer Recharge Time: 6/5/4/3
    Passively reduces all damage Visage takes based on the number of layers. A layer is lost upon taking damage and takes time to recharge.
  • Winter's Curse icon.png
    Damage Reduction: 100%
    Radius: 525
    Duration: 4.5/5/5.5 (Talent 6/6.5/7)
    Reduces all damage the target and all cursed nearby allies take.

Outgoing Damage[]

Outgoing damage manipulation causes the afflicted unit to deal increased or reduced damage. All sources within these lists stack additively with each other.

There currently are no abilities that reduce outgoing damage using the generic damage manipulator.

Spell damage amplification is handled by the general damage manipulator, and not separately. This means all sources of outgoing damage manipulation stack additively with spell damage amplification as well. Outgoing damage manipulators do not apply to damage that is Unaffected by Amplification.

Outgoing Damage Amplifiers
Outgoing Damage Reducers

Talents[]

The following heroes have a Talent talent that grants them spell damage amplification.

Bonus Level 10 Level 15 Level 20 Level 25
Left Right Left Right Left Right Left Right
Spell Amplification
  • Jakiro minimap icon.png +6%
  • Phoenix minimap icon.png +6%
  • Ancient Apparition minimap icon.png +8%
  • Batrider minimap icon.png +5%
  • Nyx Assassin minimap icon.png +8%
  • Shadow Fiend minimap icon.png +8%
  • Puck minimap icon.png +12%
  • Grimstroke minimap icon.png +15%
  • Timbersaw minimap icon.png +8%
  • Tinker minimap icon.png +10%
  • Lina minimap icon.png +11%
  • Void Spirit minimap icon.png +14%
  • Earth Spirit minimap icon.png +18%

Besides these, the following heroes have other specific spell damage amplification talents.

Spell damage amplification

Items[]

The following items grant their wielder damage amplification that only affects spell damage.

Spell damage increasing items (One value point equals 1% spell damage amplification)
Item Value Item Cost Cost/Value Point
Bloodstone icon.png Bloodstone 8 5750 Gold 718.75 Gold
Fairy's Trinket icon.png Fairy's Trinket 5 N/A N/A
Kaya icon.png Kaya 8 2050 Gold 256.25 Gold
Kaya and Sange icon.png Kaya and Sange 16 4100 Gold 256.25 Gold
Nether Shawl icon.png Nether Shawl 6 N/A N/A
Null Talisman icon.png Null Talisman 3 505 Gold 168.33 Gold
Timeless Relic icon.png Timeless Relic 15 N/A N/A
Vambrace (Intelligence) icon.png Vambrace (Intelligence) 6 N/A N/A
Yasha and Kaya icon.png Yasha and Kaya 16 4100 Gold 256.25 Gold
Values may include portions from actives or auras.

Unique Damage Manipulators[]

There are several damage manipulating abilities that do not use the generic damage manipulator. This results in them all stacking multiplicatively with each other and with abilities that do use the generic damage manipulator.

For these abilities, this means if their value is 100%, they are absolute and cannot be altered in any way.

Stacking[]

Armor and magic resistance work separately from other damage manipulators. This means they always stack multiplicatively with any other listed ability.

The effects of incoming and outgoing generic damage manipulators stack additively with themselves. Unique damage manipulators stack multiplicatively with themselves. The three sources of damage manipulation stack multiplicatively with each other after they have been combined with all of their own type.

Many source of damage manipulations have conditions on them like Bristleback where it has damage manipulation only on damage that hits his back or sides, so each damage instance calculates damage manipulation separately. Additionally, outgoing generic damage manipulators do not apply to damage that is Unaffected by Amplification.

The total damage manipulation DM is defined as

With I being any Incoming Generic Manipulation, O being any Outgoing Generic Manipulation, and U being any Unique Damage Manipulation. As there cannot be a negative value for damage manipulation, use 0 as a value in those cases.

Stacking outgoing damage manipulation stacks in the same way as incoming damage manipulation, i.e. additively. However, since incoming and outgoing manipulations happen at different times with outgoing manipulation calculation happening first, they stack multiplicatively with each other.

Example 1: Spell Damage Manipulation

Spectre minimap icon.png Spectre has level 4 Dispersion and is affected by Upgradable by Aghanim's Scepter. Stampede, Magic Weakness and Ghostship's rum buff. An enemy casted level 4 Bloodrage on himself and has Kaya icon.png Kaya. What would the damage manipulation for Spectre be in this scenario?
Incoming Generic Manipulation sources: Dispersion: -0.2, Upgradable by Aghanim's Scepter. Stampede: -0.4, Magic Weakness: 0.18.
Outgoing Generic Manipulation sources: Bloodrage: 0.3, Kaya icon.png Kaya: 0.08
Unique Generic Manipulation sources: Ghostship: -0.4
Spell Damage :

Note that Magic Weakness, Bloodrage and Kaya icon.png Kaya's amplification only apply to spell damage, therefore another calculation will be needed for non-spell damage .

Non-Spell Damage :

In this example, Spectre minimap icon.png Spectre would take 48.024% spell damage and 24% damage from non-spell damage from the enemy in this scenario.

Example 2: Additive Stacking[]

All values in this section consider the highest possible level of an ability but exclude talents and aghanim's upgrades. Examples ignore armor and magic resistance.

Ursa minimap icon.png Ursa is Enraged and is affected by Flesh Golem.

100% - 80% + 35% = 55% damage

Spectre minimap icon.png Spectre with Dispersion and is affected by Upgradable by Aghanim's Scepter. Stampede.

100% - 20% - 40% = 40% damage

A hero affected by Winter's Curse and Flesh Golem at the same time.

100% - 100% + 35% = 35% damage

Example 3: Other Multiplicative Stacking[]

All values in this section consider the highest possible level of an ability but exclude talents and aghanims upgrades. Examples ignore armor and magic resistance.

Medusa minimap icon.png Medusa activated Mana Shield and is affected by Flesh Golem.

(100% + 35%) * (100% - 70%) = 40.5% damage

Medusa minimap icon.png Medusa activated Mana Shield, is affected by Ghostship rum buff and is affected by Flesh Golem.

(100% + 35%) * (100% - 70%) * (100% - 40%) = 24.3% damage

A Conjure Image illusion (taking 320% damage) affected by Flesh Golem and Upgradable by Aghanim's Scepter. Stampede

(100% + 35% - 40%) * 320% = 304% damage

Damage negation[]

Damage negation causes entire instances of damage to deal no damage to its target, however, the instance is still registered. This means, if something reacts on damage without having a minimum damage threshold, it still reacts on the negated damage.

It is unknown whether these abilities use a separate mechanic to completely negate damage, or if they use the same unique damage manipulators as Ghostship and Mana Shield do, but with their values set to 100%.

Preventing on-damage effects[]

Many abilities react on damage a unit receives. In some cases, fully negating the damage causes them to not proc. However, some on-damage effects also react on 0 damage so they still may proc even when the proccing damage got negated.

The following abilities and effects do not react on damage when it gets fully negated (reduced to 0):

1 These work when the damage gets negated by Aphotic Shield.

2 These abilities have damage counters, which do not work when the damage gets negated.

The following abilities still do react on fully negated damage:

1 The damage of Dispersion and the damage spread of Fatal Bonds are fully unaffected by any form of reduction, except for magic resistance and armor.

Min Health[]

Lina minimap icon.png Lina casting Laguna Blade on a low health Dazzle minimap icon.png Dazzle affected by Shallow Grave and Blade Mail icon.png Blade Mail.
Lina takes the full Laguna Blade damage.

Minimum Health, just like regular damage negation, prevents a unit from dying. However, the way in which that is achieved is completely different. Instead of directly reducing or negating damage, this mechanic rather manipulates the health of the unit. The MODIFIER_PROPERTY_MIN_HEALTH property prevents a unit's health from dropping below the value it is set to. It does not affect the damage itself, meaning on-damage effects react on the full damage, and not how much damage was dealt with effectively, so they can be triggered normally.

Min Health Sources
  • Shallow Grave icon.png
    Min Health: 1
    Duration: 4/4.5/5/5.5
  • Battle Trance icon.png
    Min Health: 1
    Duration: 6.5 (Talent 8.5)
  • Reincarnation icon.png
    Aghanim's Scepter Upgrade
    Min Health: 1
    Duration: Upgradable by Aghanim's Scepter. 7
    Affects all allied heroes within a 1200 radius. Once the min health is reached, the ally gets a buff that continues applying min health, for the given duration, followed by an ensured death.



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