Armor

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Ice Armor icon.png
Armor is an attribute shared by all units. Armor is used to determine the amount of damage reduction (or amplification if an armor value is negative) a unit takes from physical damage sources. Higher armor values reduce more damage. Armor is increased by Agility, certain abilities, and some items. Most items in the armor shop provide armor bonuses.

Main armor[edit | edit source]

Main armor is the armor value shown in white numbers below the shield icon in the HUD, consisting of base armor and the armor granted by a hero's agility. The only way to improve a hero's main armor is to increase its agility.

The formula to calculate a hero's main armor is:
main armor = base armor + (agility * (1 / 7)).

Base armor[edit | edit source]

Base armor is the part of the main armor that never changes throughout a game. It consists of one fixed value set for each unit individually. The base armor of a unit can be a negative number. Since only heroes have agility, the HUD of all non-hero units shows their base armor.

The base armor of heroes can be calculated with this formula:
base armor = main armor - (agility * (1 / 7)).

Armor granted by agility[edit | edit source]

The sum of agility points a hero has is multiplied by (1 / 7) and added on top of the base armor to define the main armor value. Agility can be increased by acquiring levels, as well as specific skills and items.

Armor of heroes[edit | edit source]

Hero Base Armor Starting Armor Max Main Armor
Abaddon.png Abaddon -1 1.43 6.79
Alchemist.png Alchemist 0 1.57 5.86
Ancient Apparition.png Ancient Apparition -1 1.86 9.71
Anti-Mage.png Anti-Mage -1 2.14 12.14
Arc Warden.png Arc Warden -2 0.14 6.57
Axe.png Axe -1 1.86 9.71
Bane.png Bane 1 4.14 11.64
Batrider.png Batrider 0 2.14 7.5
Beastmaster.png Beastmaster 2 4.57 10.29
Bloodseeker.png Bloodseeker 0 3.43 14.14
Bounty Hunter.png Bounty Hunter 3 6 16.71
Brewmaster.png Brewmaster -1 2.14 9.11
Bristleback.png Bristleback 1 3.43 9.86
Broodmother.png Broodmother 0 2.57 10.43
Centaur Warrunner.png Centaur Warrunner 1 3.14 8.86
Chaos Knight.png Chaos Knight 2 4 11.5
Chen.png Chen -1 1.14 8.64
Clinkz.png Clinkz -1 2.14 13.93
Clockwerk.png Clockwerk 0 1.86 10.07
Crystal Maiden.png Crystal Maiden -1 1.29 7
Dark Seer.png Dark Seer 5 6.71 11
Dazzle.png Dazzle -1 2 8.07
Death Prophet.png Death Prophet 1 3 8
Disruptor.png Disruptor -1 1.14 6.14
Doom.png Doom -1 0.57 3.79
Dragon Knight.png Dragon Knight 1 3.71 11.57
Drow Ranger.png Drow Ranger -3 0.71 7.5
Earth Spirit.png Earth Spirit 1 3.43 8.79
Earthshaker.png Earthshaker 1 2.71 7.71
Elder Titan.png Elder Titan 1 3 8.36
Ember Spirit.png Ember Spirit -2 1.14 7.57
Enchantress.png Enchantress -2 0.71 7.14
Enigma.png Enigma 2 4 7.57
Faceless Void.png Faceless Void 0 3.29 12.75
Gyrocopter.png Gyrocopter 1 4.43 14.43
Huskar.png Huskar -1 1.14 6.14
Invoker.png Invoker -1 1 7.79
Io.png Io -2 0 5.71
Jakiro.png Jakiro 1 2.43 6.71
Juggernaut.png Juggernaut 0 3.71 12.29
Keeper of the Light.png Keeper of the Light -1 1.14 6.86
Kunkka.png Kunkka 2 4 8.64
Legion Commander.png Legion Commander 0 2.57 8.64
Leshrac.png Leshrac 0 3.29 9.36
Lich.png Lich -1 1.14 8.29
Lifestealer.png Lifestealer -1 1.57 8.36
Lina.png Lina -1 1.29 6.64
Lion.png Lion -1 1.14 6.5
Lone Druid.png Lone Druid 0 3.43 13.07
Luna.png Luna 0 2.57 14.36
Lycan.png Lycan 1 3.29 6.86
Magnus.png Magnus 2 4.14 13.07
Medusa.png Medusa -1 1.86 10.79
Meepo.png Meepo -1 2.29 10.14
Mirana.png Mirana -1 1.86 13.64
Monkey King.png Monkey King -3 0.14 11.57
Morphling.png Morphling -2 1.43 14.64
Naga Siren.png Naga Siren 3 6 15.82
Nature's Prophet.png Nature's Prophet 1 3.57 10.36
Necrophos.png Necrophos 1 3.14 7.43
Night Stalker.png Night Stalker 3 5.57 13.61
Nyx Assassin.png Nyx Assassin 1 3.71 11.57
Ogre Magi.png Ogre Magi 6 8 13.54
Omniknight.png Omniknight 3 5.14 11.39
Oracle.png Oracle 0 2.14 8.21
Outworld Devourer.png Outworld Devourer 0.5 3.93 11.07
Phantom Assassin.png Phantom Assassin 1 4.29 15.54
Phantom Lancer.png Phantom Lancer 0 4.14 13.43
Phoenix.png Phoenix -2 -0.29 4.36
Puck.png Puck -1 2.14 8.21
Pudge.png Pudge -1 1 6.36
Pugna.png Pugna -1 1.29 4.86
Queen of Pain.png Queen of Pain -1 1.57 8.71
Razor.png Razor -1 2.14 9.29
Riki.png Riki 0 4.86 12.71
Rubick.png Rubick -1 1 6.71
Sand King.png Sand King 0 2.71 10.21
Shadow Demon.png Shadow Demon 0 2.57 10.43
Shadow Fiend.png Shadow Fiend -2 0.86 11.21
Shadow Shaman.png Shadow Shaman -1 1.29 7
Silencer.png Silencer -1 2.14 12.86
Skywrath Mage.png Skywrath Mage -2 -0.14 2.71
Slardar.png Slardar 3 5.43 14
Slark.png Slark -1 2 7.36
Sniper.png Sniper -1 2 10.93
Spectre.png Spectre 0 3.29 9.71
Spirit Breaker.png Spirit Breaker 3 5.43 11.5
Storm Spirit.png Storm Spirit 2 5.14 11.57
Sven.png Sven 2 5 12.14
Techies.png Techies 5 7 11.64
Templar Assassin.png Templar Assassin 1 4.29 13.93
Terrorblade.png Terrorblade 7 10.14 21.57
Tidehunter.png Tidehunter 1 3.14 8.5
Timbersaw.png Timbersaw -2 0.29 4.93
Tinker.png Tinker 2 3.86 8.14
Tiny.png Tiny -1 0.29 3.5
Treant Protector.png Treant Protector -1 1.14 8.29
Troll Warlord.png Troll Warlord -1 2 11.82
Tusk.png Tusk 0 3.29 10.79
Underlord.png Underlord 2 3.71 8.36
Undying.png Undying 2 3.43 6.29
Ursa.png Ursa 3 5.57 13.07
Vengeful Spirit.png Vengeful Spirit 0 3.86 15.64
Venomancer.png Venomancer 0 3.14 12.43
Viper.png Viper -1 2 12.36
Visage.png Visage -2 -0.43 4.21
Warlock.png Warlock 1 2.43 6
Weaver.png Weaver -1 1 11
Windranger.png Windranger -1 1.43 6.43
Winter Wyvern.png Winter Wyvern -1 1.29 8.07
Witch Doctor.png Witch Doctor -1 0.86 5.86
Wraith King.png Wraith King 0 2.57 8.64
Zeus.png Zeus 0 1.57 5.86

Bonus armor[edit | edit source]

Bonus armor is the armor value shown in green numbers with a plus on the left, right below the white armor number on a unit's statistics. Whenever an item or skill shows a +armor value, eg Blade Mail (+6 Armor), it increases the bonus armor of the affected unit. The difference between main and bonus armor is that illusions only benefit from main armor, although their HUD still shows the bonus armor just like on other heroes, to make them less obvious to the enemy.

Armor manipulation[edit | edit source]

Armor increasing abilities[edit | edit source]

The following abilities are able to increase unit's armor:

Unit abilities
  • Dragonhide Aura (Ancient Black Dragon) icon.png
    Radius: 900
    Armor Bonus: 3
    Aura, buffs all allies within range. Buff lingers for a short while. Stack with itself.
  • Berserker's Call icon.png
    Armor Bonus: 40
    Duration: 2/2.4/2.8/3.2
    Buffs Axe upon cast.
  • Weave icon.png
    Radius: 575 (Upgradable by Aghanim's Scepter. 775)
    Armor Bonus per Second: 0.75/1/1.25 (Upgradable by Aghanim's Scepter. 1.25/1.5/1.75)
    Duration: 24
    Buffs all allies within the area upon cast.
  • Dragon Blood icon.png
    Armor Bonus: 3/6/9/12 (Talent 6/12/18/24)
    Passive, permanent bonus.
  • Marksmanship icon.png
    Armor Bonus: 5.6/8.4/11.2
    Increases armor by granting agility. Bonuses are temporarily lost when enemy heroes get too close.
  • Ice Armor icon.png
    Armor Bonus: 3/5/7/9 (Talent 38/40/42/44 for buildings)
    Duration: 40
    Buffs the target upon cast.
  • Battle Cry icon.png
    Radius: 1000
    Armor Bonus: 10/15/20
    Duration: 6
    Buffs all of Lone Druid's units within range upon cast.
  • True Form icon.png
    Armor Bonus: 4/6/8
    Increases armor until transforming back.
  • Morph (Agility Gain) icon.png
    Armor Bonus: 0.14 per shifted strength
  • Ice Armor (Ogre Frostmage) icon.png
    Armor Bonus: 8
    Duration: 45
    Buffs the target upon cast.
  • Unknown icon.png
    Armor Bonus per 4 Minutes: 0.7
    Passive, increases Roshan's armor as time goes by.
  • Essence Shift icon.png
    Armor Bonus: 0.14 per converted agility
    Stack Duration: 15/30/60/120
    Steals 1 of each stats from attack targets and converts them into agility for self. The stacks' durations are independent from each other.
  • Warcry icon.png
    Radius: 900
    Armor Bonus: 5/10/15/20
    Duration: 8
    Buffs allies within range upon cast.
  • Reactive Armor icon.png
    Max Stacks: 5/10/15/20
    Armor Bonus per Stack: 1/1.2/1.4/1.6
    Stack Duration: 10/13/16/19
    Passive, grants a stack whenever attacked. The stacks' durations are independent from each other.
  • Craggy Exterior icon.png
    Armor Bonus: 3/4/5/6
    Passive, permanent bonus.
  • Tower Protection icon.png
    Radius: 900
    Armor Bonus: 1/3/3/3
    Tier 1 towers provide 1 armor, tier 2/3/4 provide 3 armor.
  • Berserker's Rage icon.png
    Armor Bonus: 6
    Grants armor until toggled off.
  • Toughness Aura (Wildwing Ripper) icon.png
    Radius: 900
    Armor Bonus: 3
    Aura, buffs all allies within range. Buff lingers for a short while.


Item abilities
  • Assault Cuirass icon.png
    Radius: 900
    Armor Bonus: 5
    Aura, buffs all allies within range. Buff lingers for a short while.
  • Buckler icon.png
    Radius: 900
    Armor Bonus: 2
    Hero Duration: 25
    Non-Hero Duration: 30
    Buffs allies within range upon cast.
  • Crimson Guard icon.png
    Radius: 900
    Armor Bonus: 2
    Duration: 10
    Buffs allies within range upon cast.
  • Guardian Greaves icon.png
    Radius: 900
    Armor Bonus: 2
    Boost Health Threshold: 20%
    Boosted Armor Bonus: 15
    Aura, buffs all allies within range. Buff lingers for a short while.
  • Medallion of Courage icon.png
    Ally Armor Bonus: 7
    Duration: 7
    Increases the target ally's armor upon cast.
  • Mekansm icon.png
    Radius: 900
    Armor Bonus: 2
    Duration: 25
    Buffs allies within range upon cast.
  • Ring of Aquila (Active) icon.png
    Radius: 900
    Armor Bonus: 2
    Aura, buffs all allies within range. Buff lingers for a short while.
  • Ring of Basilius (Active) icon.png
    Radius: 900
    Armor Bonus: 2
    Aura, buffs all allies within range. Buff lingers for a short while.
  • Solar Crest icon.png
    Ally Armor Bonus: 12
    Duration: 7
    Increases the target ally's armor upon cast.
  • Vladmir's Offering icon.png
    Radius: 900
    Armor Bonus: 5
    Aura, buffs all allies within range. Buff lingers for a short while.

Armor reducing abilities[edit | edit source]

The following abilities are able to reduce unit's armor:

Unit abilities
  • Acid Spray icon.png
    Radius: 625
    Armor Reduction: 4/5/6/7 (Talent 9/10/11/12)
    Spray Duration: 16
    Aura, debuffs all enemies within range. The debuff lingers for a short while.
  • Desecrate (Ancient Prowler Shaman) icon.png
    Radius: 300
    Base Armor Reduction: 50%
    Duration: 6
    Debuffs all enemies within range upon cast. Only reduces base armor and that granted by agility.
  • Viscous Nasal Goo icon.png
    Max Stacks: 4 (Talent 8)
    Armor Reduction per Stack: 1/1.4/1.8/2.2
    Hero Duration: 5
    Creep Duration: 10
    Applies a debuff on the target upon cast. All stacks expire simultaneously.
  • Reality Rift icon.png
    Armor Reduction: 1/3/5/7
    Duration: 8
    Applies a debuff on the target upon cast, before the attack is applied.
  • Weave icon.png
    Radius: 575 (Upgradable by Aghanim's Scepter. 775)
    Armor Reduction per Second: 0.75/1/1.25 (Upgradable by Aghanim's Scepter. 1.25/1.5/1.75)
    Duration: 24
    Debuffs all enemies within the area upon cast.
  • Natural Order icon.png
    Radius: 350
    Base Armor Reduction: 40%/60%/80%/100%
    Aura, debuffs all enemies within range. The debuff lingers for a short while. Only reduces base armor and that granted by agility.
  • Melting Strike (Forged Spirit) icon.png
    Armor Reduction per Attack: 1
    Armor Reduction Cap: 10
    Debuffs the attack target upon projectile impact, after the attack damage is applied. The stacks expire simultaneously.
  • Morph (Strength Gain) icon.png
    Armor Reduction: 0.14 per shifted agility
  • Rip Tide icon.png
    Radius: 320
    Armor Reduction: 2/3/4/5
    Duration: 8
    Debuffs all enemies within range upon cast.
  • Eye of the Storm icon.png
    Strike Interval: 0.7/0.6/0.5 (Upgradable by Aghanim's Scepter. 0.6/0.5/0.4)
    Armor Reduction per Strike: 1
    Duration: 30
    Adds a stack on the attack target upon lightning impact, after the damage is applied. Does not reduce armor of struck buildings. Armor Reduction expires when the storm does.
  • Presence of the Dark Lord icon.png
    Radius: 900
    Armor Reduction: 3/4/5/6
    Aura, debuffs all enemies which have vision over Shadow Fiend within range. The debuff lingers for a short while.
  • Corrosive Haze icon.png
    Armor Reduction: 10/15/20
    Duration: 25
    Debuffs the target upon cast.
  • Essence Shift icon.png
    Armor Reduction: 0.14 per lost agility
    Steals 1 of each stats from attack targets and converts them into agility for self. The stacks' durations are independent from each other.
  • Meld icon.png
    Armor Reduction: 2/4/6/8
    Duration: 10
    Debuffs the attack target upon projectile impact, after the attack damage is applied, but before Meld damage is applied.
  • Gush icon.png
    Armor Reduction: 3/4/5/6 (Talent 9/10/11/12)
    Duration: 4
    Debuffs the target upon projectile impact.
  • Whirling Death icon.png
    Radius: 300
    Armor Reduction: 0.14 per lost agility
    Duration: 7
    All affected agility heroes lose agility, and therefore lose armor for the duration.
  • Wave of Terror icon.png
    Travel Distance: 1400
    Radius: 300
    Armor Reduction: 3/4/5/6
    Duration: 15
    Debuffs all hit enemies.
  • The Swarm icon.png
    Attack Interval: 1.25/1.1/0.95/0.8
    Armor Reduction per Attack: 1
    Duration: 16
    Adds a stack on affected units on each interval, before the damage is applied. Armor reduction lasts as long as the beetle does or until it is killed.


Item abilities
  • Assault Cuirass icon.png
    Radius: 900
    Armor Reduction: 5
    Aura, debuffs all enemies within range. Debuff lingers for a short while.
  • Blight Stone icon.png
    Armor Reduction: 2
    Duration: 8
    Debuffs the attack target upon attack/projectile, before the attack damage is applied.
  • Desolator icon.png
    Armor Reduction: 7
    Duration: 15
    Debuffs the attack target upon attack/projectile, before the attack damage is applied.
  • Mask of Madness icon.png
    Armor Reduction: 5
    Duration: 8
    Applies the armor reduction on the caster in the form of a buff, so it cannot be removed with allied dispels.
  • Medallion of Courage icon.png
    Armor Reduction: 7
    Duration: 7
    Debuffs the caster and the target enemy upon cast. Also debuffs self when targeting allies.
  • Solar Crest icon.png
    Armor Reduction: 12
    Duration: 7
    Debuffs the caster and the target enemy upon cast. Also debuffs self when targeting allies.

Armor granting items[edit | edit source]

The following items increase a unit's Armor. The effects are limited to the item's owner, which must have the item equipped.


Armor increasing items
Item Value Item cost Cost per value point
Aghanim's Scepter icon.png Aghanim's Scepter 1.43 4200 2937.06
Armlet of Mordiggian (Inactive) icon.png Armlet of Mordiggian 9 2370 263.33
Assault Cuirass icon.png Assault Cuirass 15 5250 350
Band of Elvenskin icon.png Band of Elvenskin 0.86 450 523.26
Blade Mail icon.png Blade Mail 6 2200 366.67
Blade of Alacrity icon.png Blade of Alacrity 1.43 1000 699.3
Bracer icon.png Bracer 0.43 505 1174.42
Buckler icon.png Buckler 5.29 800 151.23
Butterfly icon.png Butterfly 5 5525 1105
Chainmail icon.png Chainmail 5 550 110
Circlet icon.png Circlet 0.29 165 568.97
Crimson Guard icon.png Crimson Guard 7.29 3550 486.97
Dagon 1 icon.png Dagon 1 0.43 2720 6325.58
Dagon 2 icon.png Dagon 2 0.43 3970 9232.56
Dagon 3 icon.png Dagon 3 0.43 5220 12139.53
Dagon 4 icon.png Dagon 4 0.43 6470 15046.51
Dagon 5 icon.png Dagon 5 0.43 7720 17953.49
Diffusal Blade 1 icon.png Diffusal Blade 1 3.57 3150 882.35
Diffusal Blade 2 icon.png Diffusal Blade 2 5 3850 770
Dragon Lance icon.png Dragon Lance 1.86 1900 1021.51
Drum of Endurance icon.png Drum of Endurance 0.43 1780 4139.53
Eaglesong icon.png Eaglesong 3.57 3200 896.36
Ethereal Blade icon.png Ethereal Blade 5.71 4700 823.12
Eye of Skadi icon.png Eye of Skadi 3.57 5675 1589.64
Ghost Scepter icon.png Ghost Scepter 0.71 1500 2112.68
Guardian Greaves icon.png Guardian Greaves 7.71 5275 684.18
Headdress icon.png Headdress 0.29 575 1982.76
Helm of Iron Will icon.png Helm of Iron Will 5 900 180
Helm of the Dominator icon.png Helm of the Dominator 0.57 1800 3157.89
Hurricane Pike icon.png Hurricane Pike 2.86 4375 1529.72
Iron Branch icon.png Iron Branch 0.14 50 357.14
Iron Talon icon.png Iron Talon 2 500 250
Linken's Sphere icon.png Linken's Sphere 2.14 4800 2242.99
Lotus Orb icon.png Lotus Orb 10 4000 400
Magic Wand icon.png Magic Wand 0.57 465 815.79
Manta Style icon.png Manta Style 3.71 4950 1334.23
Medallion of Courage icon.png Medallion of Courage 7 1175 167.86
Mekansm icon.png Mekansm 5.71 2275 398.42
Null Talisman icon.png Null Talisman 0.43 470 1093.02
Platemail icon.png Platemail 10 1400 140
Poor Man's Shield icon.png Poor Man's Shield 0.86 500 581.4
Power Treads (Agility) icon.png Power Treads (Agility) 1.29 1350 1046.51
Ring of Aquila (Active) icon.png Ring of Aquila 3.29 985 299.39
Ring of Basilius (Active) icon.png Ring of Basilius 2 500 250
Ring of Protection icon.png Ring of Protection 2 175 87.5
Sange and Yasha icon.png Sange and Yasha 2.29 4100 1790.39
Scythe of Vyse icon.png Scythe of Vyse 1.43 5650 3951.05
Shiva's Guard icon.png Shiva's Guard 15 4700 313.33
Silver Edge icon.png Silver Edge 2.14 5100 2383.18
Slippers of Agility icon.png Slippers of Agility 0.43 150 348.84
Solar Crest icon.png Solar Crest 12 2625 218.75
Tranquil Boots (Active) icon.png Tranquil Boots (Active) 3 900 300
Tranquil Boots (Inactive) icon.png Tranquil Boots (Inactive) 3 900 300
Ultimate Orb icon.png Ultimate Orb 1.43 2100 1468.53
Veil of Discord icon.png Veil of Discord 6.86 2240 326.53
Vladmir's Offering icon.png Vladmir's Offering 4.29 2275 530.3
Wraith Band icon.png Wraith Band 0.86 485 563.95
Yasha icon.png Yasha 2.29 2050 895.2
Values may include portions from actives or auras.

Damage multiplier[edit | edit source]

Damage multiplier based on hero's armor rating
Damage increase of armor reductions as a function of existing armor

All units, including buildings, have an inherent base armor value and armor type. Any physical damage dealt to a unit suffers either a damage reduction or a damage increase depending on the target's armor.

The damage multiplier for both positive and negative armor:

Damage multiplier = 1 - 0.06 × armor ÷ (1 + (0.06 × |armor|))

In Dota 2, the cap on this number is 100% damage amplification or reduction, but it requires an infinite amount of negative or positive armor to truly reach these caps.

Examples

Armor Damage multiplier Armor Damage multiplier
1 94.3% -1 105.7%
2 89.3% -2 110.7%
5 76.9% -5 123.1%
10 62.5% -10 137.5%
15 52.6% -15 147.4%
20 45.5% -20 154.5%

Effective HP[edit | edit source]

Relationships between effective HP %, damage multiplier and armor

It is useful to first understand the concept of effective HP. The damage reduction and increase percentage formulas are directly related to the effective HP formulas in the previous section. The amount of physical damage a unit can take before dying (hence likelihood of surviving) is not proportional to damage reduction percentages, but to effective HP. Effective HP is the amount of physical damage one can take before dying, and is based on the unit's HP.

For positive armor values, a unit gains 6% of their health per armor as effective HP. A hero with 0 armor and a base HP of 1000 increases his effective HP by 60% if he increases his armor to 10. For negative armor values, the effective HP reduction diminishes with decreasing armor, trending towards 0%.

Armor -20 -10 0 10 20
Effective HP 647 727 1000 1600 2200

One has to consider that effective HP only takes physical damage in consideration. The example assumes that all the damage the unit takes is physical. Armor actually grants 6% of the physical damage one takes. This becomes more evident with burst magical damage (such as Lina's or Lion's ultimate): the armor value in those cases count for nothing.


Calculating effective HP:

Effective HP = Total HP ÷ Damage multiplier


Example 1:

A level 25 Sven icon.png Sven​ has a total HP of 2183 and 11.46 points of armor. What is his effective HP vs physical damage?
2183 HP ÷ ( 1 - (11.46 × 0.06) ÷ (1 + 11.46 × 0.06) ) = 2183 HP ÷ 0.5925 = 3684 effective HP
Sven can tank 3684 of physical damage before he dies.


Example 2:

The same Sven from previous example is hit by a maxed Corrosive Haze icon.png Corrosive Haze​. His armor is now -8.54. What is his effective HP vs physical damage?
2183 HP ÷ ( 1 - (-8.54 × 0.06) ÷ (1 + 8.54 × 0.06) ) = 2183 HP ÷ 1.3388 = 1631 effective HP
Sven can tank 1631 of physical damage before he dies.

Armor types[edit | edit source]

There are several different types of armor, which determine how much damage a unit takes against certain attack damage types. Each of the 3 different armor types either reduces, increases or does not affect the damage from each of the damage types, on top of armor values manipulating them.

Example
A hero with 100 attack damage attacking a siege unit which has 0 armor deals 50 damage to it, because the attack type "hero" deals 50% less damage against the armor type "structure", which is the siege creeps' and all buildings' armor type. If the siege creep would gain 5 armor, the 100 damage attack would deal (100 * 0.769 * 0.5) = 38.45 damage. The same attack would deal 76.9 damage to a unit with any other armor type, since attack type hero deals full damage to them.

This table shows how much damage each armor type reduces against each attack damage type and which unit uses which armor type (units which take a set amount of damage per attack are excluded).

Armor Type Used by Attack Damage Type
Hero Basic Pierce Siege
Hero Heroes, Primal Split spirits, Warlock's Golem, Familiar, Roshan 100% 75% 50% 85%
Basic Lane creeps, Observer and Sentry Wards, courier, Hawk, All neutral creeps, Skeleton Warrior, Plague Ward, Eidolon, Treant, Greater Treant, Forged Spirit, Spiderling, Spiderite, Boar, Lycan Wolf, Necronomicon Archer and Warrior, Spirit Bear, Proximity Mine, Stasis Trap, Remote Mine 100% 100% 150% 100%
Structure Buildings, siege creeps 50% 70% 35% 150%

Trivia[edit | edit source]

  • In DotA 1 the base magic resistance was bound to the assigned armor. In case of Hero Armor only 75% of the magic damage was applied. Some heroes possessed hidden passive skills to alter their base magic susceptibility albeit Hero Armor to
    90% (Visage icon.png Visage​) or 65% (Meepo icon.png Meepo​). Nowdays in DotA 2 magic resistance works independently from armor.
  • The deprecated Light damage type used to be called Chaos damage in DotA 1.
  • Regarding armor in DotA 1, Weak was named Light, Soft was referred to as Unarmored, Basic was called Medium and Strong was known as Heavy.


Negative armor disparity[edit | edit source]

Negative armor damage multiplier for DotA and Dota 2
This graph shows how much more additional damage a target takes when armor debuffs are applied, using the WC3 DotA armor formula.

Amplified damage from negative armor is calculated differently in WC3 DotA than in Dota 2.[1].

Negative armor in WC3 DotA has a cap of -20 armor (71% damage increase). Further reducing the armor does not change the damage increase.[2]. Also, the more aggressive damage amplify formula is used resulting in a max damage increase of 71 %. The amplified damage is calculated from this formula:

Damage increase = 1 - 0.94^(-armor)

Comparison table

Balance changelog[edit | edit source]

See Damage#Balance changelog

See also[edit | edit source]

References[edit | edit source]

  1. Dota2 Development Forum bug report: [Confirmed] Negative armor has a different effect in DotA2 in comparison to Dota1
  2. PlayDotA Mechanics: Damage and Armor - DotA Mechanics