Armor

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Armor
 
 
Ice Armor (Ogre Frostmage) icon.png
▶️ Armored to the teeth!
Clockwerk

Armor is a stat that reduces (or increases, if negative) physical damage a unit takes from spells and attacks. Every unit is capable of gaining or losing armor, and most units start with a small amount of base armor, some even starting with negative armor. A hero's armor can be passively increased with Agility attribute symbol.png agility, certain items, talents and some abilities. Armor of any unit can also be temporarily increased or reduced with some abilities.

Each point of Agility attribute symbol.png agility increases a hero's armor by 0.167 or .

Total armor is defined as

With R being the index of Armor, RM being the index of Main Armor, RnegMu being the index of Armor Negating Multiplier and RBonus being the index of Bonus Armor (Armor values from other than Agility attribute symbol.png agility sources).

Base Armor[edit]

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.

Heroes[edit]

Heroes Armor
Puck -3
Lone Druid, Morphling, Skywrath Mage, Viper, Visage -2
Abaddon, Alchemist, Ancient Apparition, Anti-Mage, Arc Warden, Axe, Beastmaster, Brewmaster, Chen, Crystal Maiden, Dark Willow, Dazzle, Ember Spirit, Huskar, Keeper of the Light, Lich, Lycan, Mars, Medusa, Mirana, Phoenix, Pudge, Razor, Sand King, Silencer, Sniper, Timbersaw, Treant Protector, Troll Warlord, Void Spirit, Windranger, Winter Wyvern, Wraith King -1
Broodmother, Centaur Warrunner, Clinkz, Clockwerk, Disruptor, Doom, Dragon Knight, Drow Ranger, Earth Spirit, Elder Titan, Faceless Void, Grimstroke, Hoodwink, Invoker, Juggernaut, Legion Commander, Leshrac, Lina, Lion, Nature's Prophet, Oracle, Phantom Lancer, Pugna, Queen of Pain, Rubick, Shadow Demon, Shadow Fiend, Slark, Snapfire, Spectre, Tidehunter, Tiny, Vengeful Spirit, Venomancer, Weaver, Witch Doctor 0
Bane, Batrider, Bristleback, Death Prophet, Enchantress, Io, Jakiro, Kunkka, Lifestealer, Magnus, Necrophos, Nyx Assassin, Omniknight, Pangolier, Phantom Assassin, Sven, Templar Assassin, Tusk, Undying, Ursa, Warlock, Zeus 1
Bloodseeker, Chaos Knight, Dark Seer, Earthshaker, Enigma, Gyrocopter, Luna, Monkey King, Night Stalker, Shadow Shaman, Spirit Breaker, Storm Spirit, Tinker 2
Meepo, Naga Siren, Riki, Slardar, Underlord 3
Outworld Destroyer 3.5
Bounty Hunter 4
Ogre Magi, Techies 5
Terrorblade 7

Creeps[edit]

Units Armor
Ancient Black Drake -1
Hill Troll, Hill Troll Priest, Kobold, Mud Golem, Ogre Frostmage, Ranged Creep, Satyr Banisher, Satyr Tormenter, Shard Golem, Siege Creep, Super Siege Creep 0
Centaur Courser, Dark Troll Summoner, Fell Spirit, Ghost, Giant Wolf, Harpy Scout, Hill Troll Berserker, Kobold Foreman, Kobold Soldier, Mega Ranged Creep, Ogre Bruiser, Satyr Mindstealer, Super Ranged Creep, Vhoul Assassin 1
Ancient Prowler Acolyte 10
Ancient Prowler Shaman 11
Ancient Rumblehide, Ancient Thunderhide, Harpy Stormcrafter, Melee Creep, Wildwing 2
Roshan 20
Alpha Wolf, Ancient Black Dragon, Hellbear, Mega Melee Creep, Super Melee Creep 3
Ancient Rock Golem, Centaur Conqueror, Hellbear Smasher, Wildwing Ripper 4
Ancient Granite Golem 8

Summons[edit]

Summons Armor
Astral Spirit, Boar, Greater Treant, Lycan Lane Wolf, Lycan Wolf, Spiderite, Spiderling, Treant, Undying Zombie 0
Familiar 0/1/2
Forged Spirit 0/1/2/3/4/5/6
Fire 0/4/8
Skeleton Warrior, Wraith King Skeleton 1
Storm 2
Eidolon 2/3/4/5
Void 3/4/5
Spirit Bear 3/4/5/6
Earth 3/5/7
Necronomicon Archer, Necronomicon Warrior 4
Hawk 5
Warlock Golem 6/9/12

Main Armor[edit]

Main armor is the armor value shown in white numbers near 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 attribute symbol.png agility, which is gained by leveling up, acquiring certain items, or with the help of certain abilities.

The main armor is defined as

With RM being the index of Main Armor, RB being the index of Base Armor and l being the index of the hero's level.

Hero Armor
Hero Base Level 1 Level 15 Level 25 Level 30
Abaddon icon.png Abaddon -1 2.83 6.33 8.83 10.08
Alchemist icon.png Alchemist -1 2.67 6.17 8.67 9.92
Ancient Apparition icon.png Ancient Apparition -1 2.33 7.47 11.13 12.97
Anti-Mage icon.png Anti-Mage -1 3 9.53 14.2 16.53
Arc Warden icon.png Arc Warden -1 1.67 7.5 11.67 13.75
Axe icon.png Axe -1 2.33 7.47 11.13 12.97
Bane icon.png Bane 1 4.67 10.73 15.07 17.23
Batrider icon.png Batrider 1 3.5 7.7 10.7 12.2
Beastmaster icon.png Beastmaster -1 2 5.73 8.4 9.73
Bloodseeker icon.png Bloodseeker 2 5.67 13.6 19.27 22.1
Bounty Hunter icon.png Bounty Hunter 4 7.5 13.57 17.9 20.07
Brewmaster icon.png Brewmaster -1 2.17 6.83 10.17 11.83
Bristleback icon.png Bristleback 1 3.83 8.03 11.03 12.53
Broodmother icon.png Broodmother 0 2.5 9.5 14.5 17
Centaur Warrunner icon.png Centaur Warrunner 0 2.5 4.83 6.5 7.33
Chaos Knight icon.png Chaos Knight 2 5 8.27 10.6 11.77
Chen icon.png Chen -1 1.5 6.4 9.9 11.65
Clinkz icon.png Clinkz 0 3.67 9.97 14.47 16.72
Clockwerk icon.png Clockwerk 0 2.17 7.53 11.37 13.28
Crystal Maiden icon.png Crystal Maiden -1 1.67 5.4 8.07 9.4
Dark Seer icon.png Dark Seer 2 5 9.2 12.2 13.7
Dark Willow icon.png Dark Willow -1 2 5.73 8.4 9.73
Dazzle icon.png Dazzle -1 2.5 6.47 9.3 10.72
Death Prophet icon.png Death Prophet 1 3.33 6.6 8.93 10.1
Disruptor icon.png Disruptor 0 2.5 5.77 8.1 9.27
Doom icon.png Doom 0 1.83 3.93 5.43 6.18
Dragon Knight icon.png Dragon Knight 0 3.17 7.83 11.17 12.83
Drow Ranger icon.png Drow Ranger 0 3.33 10.1 14.93 17.35
Earth Spirit icon.png Earth Spirit 0 2.83 8.43 12.43 14.43
Earthshaker icon.png Earthshaker 2 4 7.27 9.6 10.77
Elder Titan icon.png Elder Titan 0 2.33 6.53 9.53 11.03
Ember Spirit icon.png Ember Spirit -1 2.67 8.73 13.07 15.23
Enchantress icon.png Enchantress 1 4.17 8.37 11.37 12.87
Enigma icon.png Enigma 2 4.33 6.67 8.33 9.17
Faceless Void icon.png Faceless Void 0 3.17 10.17 15.17 17.67
Grimstroke icon.png Grimstroke 0 3 7.43 10.6 12.18
Gyrocopter icon.png Gyrocopter 2 6.33 14.73 20.73 23.73
Hoodwink icon.png Hoodwink 0 4 12.4 18.4 21.4
Huskar icon.png Huskar -1 1.5 5.7 8.7 10.2
Invoker icon.png Invoker 0 2.33 6.77 9.93 11.52
Io icon.png Io 1 3.33 7.07 9.73 11.07
Jakiro icon.png Jakiro 1 2.67 5.47 7.47 8.47
Juggernaut icon.png Juggernaut 0 5.67 12.2 16.87 19.2
Keeper of the Light icon.png Keeper of the Light -1 1.5 5.23 7.9 9.23
Kunkka icon.png Kunkka 1 3.33 6.37 8.53 9.62
Legion Commander icon.png Legion Commander 0 3 6.97 9.8 11.22
Leshrac icon.png Leshrac 0 3.83 10.37 15.03 17.37
Lich icon.png Lich -1 1.5 6.17 9.5 11.17
Lifestealer icon.png Lifestealer 1 4 9.6 13.6 15.6
Lina icon.png Lina 0 3.83 8.03 11.03 12.53
Lion icon.png Lion 0 3 6.5 9 10.25
Lone Druid icon.png Lone Druid -2 1.33 7.87 12.53 14.87
Luna icon.png Luna 2 6 13.93 19.6 22.43
Lycan icon.png Lycan -1 1.67 4 5.67 6.5
Magnus icon.png Magnus 1 3.5 9.33 13.5 15.58
Mars icon.png Mars -1 2.33 6.77 9.93 11.52
Medusa icon.png Medusa -1 2.67 11.07 17.07 20.07
Meepo icon.png Meepo 3 5.83 10.03 13.03 14.53
Mirana icon.png Mirana -1 2 10.63 16.8 19.88
Monkey King icon.png Monkey King 2 5.67 14.3 20.47 23.55
Morphling icon.png Morphling -2 2 12.03 19.2 22.78
Naga Siren icon.png Naga Siren 3 6.5 14.67 20.5 23.42
Nature's Prophet icon.png Nature's Prophet 0 3.67 12.07 18.07 21.07
Necrophos icon.png Necrophos 1 3 6.03 8.2 9.28
Night Stalker icon.png Night Stalker 2 5 10.37 14.2 16.12
Nyx Assassin icon.png Nyx Assassin 1 4.17 10 14.17 16.25
Ogre Magi icon.png Ogre Magi 5 7.33 10.83 13.33 14.58
Omniknight icon.png Omniknight 1 3.5 7.7 10.7 12.2
Oracle icon.png Oracle 0 2.5 6.47 9.3 10.72
Outworld Destroyer icon.png Outworld Destroyer 3.5 7.17 10.9 13.57 14.9
Pangolier icon.png Pangolier 1 4 11.47 16.8 19.47
Phantom Assassin icon.png Phantom Assassin 1 4.83 12.77 18.43 21.27
Phantom Lancer icon.png Phantom Lancer 0 4.33 11.8 17.13 19.8
Phoenix icon.png Phoenix -1 1 4.03 6.2 7.28
Puck icon.png Puck -3 0.67 6.5 10.67 12.75
Pudge icon.png Pudge -1 1.33 4.6 6.93 8.1
Pugna icon.png Pugna 0 4 7.03 9.2 10.28
Queen of Pain icon.png Queen of Pain 0 3.67 9.5 13.67 15.75
Razor icon.png Razor -1 2.67 8.73 13.07 15.23
Riki icon.png Riki 3 6 9.27 11.6 12.77
Rubick icon.png Rubick 0 3.83 9.67 13.83 15.92
Sand King icon.png Sand King -1 2.17 6.37 9.37 10.87
Shadow Demon icon.png Shadow Demon 0 3 8.13 11.8 13.63
Shadow Fiend icon.png Shadow Fiend 0 3.33 11.5 17.33 20.25
Shadow Shaman icon.png Shadow Shaman 2 4.67 8.4 11.07 12.4
Silencer icon.png Silencer -1 2.67 8.27 12.27 14.27
Skywrath Mage icon.png Skywrath Mage -2 0.17 2.03 3.37 4.03
Slardar icon.png Slardar 3 5.83 11.43 15.43 17.43
Slark icon.png Slark 0 3.5 7.47 10.3 11.72
Snapfire icon.png Snapfire 0 2.67 7.1 10.27 11.85
Sniper icon.png Sniper -1 3.5 10.97 16.3 18.97
Spectre icon.png Spectre 0 3.83 8.73 12.23 13.98
Spirit Breaker icon.png Spirit Breaker 2 4.83 8.8 11.63 13.05
Storm Spirit icon.png Storm Spirit 2 5.67 9.63 12.47 13.88
Sven icon.png Sven 1 4.5 9.17 12.5 14.17
Techies icon.png Techies 5 7.33 10.37 12.53 13.62
Templar Assassin icon.png Templar Assassin 1 4.83 12.3 17.63 20.3
Terrorblade icon.png Terrorblade 7 10.67 21.87 29.87 33.87
Tidehunter icon.png Tidehunter 0 2.5 6 8.5 9.75
Timbersaw icon.png Timbersaw -1 1.67 5.4 8.07 9.4
Tinker icon.png Tinker 2 4.17 6.97 8.97 9.97
Tiny icon.png Tiny 0 0 0 0 0
Treant Protector icon.png Treant Protector -1 1.5 6.17 9.5 11.17
Troll Warlord icon.png Troll Warlord -1 2.5 10.2 15.7 18.45
Tusk icon.png Tusk 1 4.83 9.73 13.23 14.98
Underlord icon.png Underlord 3 5 8.73 11.4 12.73
Undying icon.png Undying 1 2.67 4.53 5.87 6.53
Ursa icon.png Ursa 1 4 9.6 13.6 15.6
Vengeful Spirit icon.png Vengeful Spirit 0 3.33 12.2 18.53 21.7
Venomancer icon.png Venomancer 0 4.33 11.8 17.13 19.8
Viper icon.png Viper -2 1.5 7.33 11.5 13.58
Visage icon.png Visage -2 -0.17 2.87 5.03 6.12
Void Spirit icon.png Void Spirit -1 2.17 7.3 10.97 12.8
Warlock icon.png Warlock 1 2.67 5 6.67 7.5
Weaver icon.png Weaver 0 2.33 9.57 14.73 17.32
Windranger icon.png Windranger -1 1.83 5.1 7.43 8.6
Winter Wyvern icon.png Winter Wyvern -1 1.67 6.1 9.27 10.85
Witch Doctor icon.png Witch Doctor 0 2.17 5.43 7.77 8.93
Wraith King icon.png Wraith King -1 2 5.97 8.8 10.22
Zeus icon.png Zeus 1 2.83 5.63 7.63 8.63

Bonus Armor[edit]

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 armor granting item or armor increasing ability shows a +Value Armor, e.g. Blade Mail icon.png Blade Mail +6 Armor, it increases the bonus armor of the affected unit.

Probably the most important 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. Some abilities like Marksmanship and Natural Order also only affect main armor.

Modifying Armor[edit]

A lot of abilities and items have abilities that grant or reduce armor. These changes always affect bonus armor, and never added to the main armor.

Armor Increasing Abilities[edit]

The following abilities increase armor:

Armor increasing abilities
Armor increasing items

Armor Reducing Abilities[edit]

Armor Corruption's icon

The following heroes have a talent that causes their attacks to reduce armor of the attacked target. This is also known as Armor Corruption.

The reduction lasts 10 seconds. Multiple sources of Armor Corruption do not stack.

Bonus Level 10 Level 15 Level 20 Level 25
Left Right Left Right Left Right Left Right
Armor Corruption: Reduces armor on attack. Armor Corruption
  • Visage minimap icon.png -3
  • Hoodwink minimap icon.png -3
  • Phantom Assassin minimap icon.png -3

The following abilities reduce armor:

Armor reducing abilities
  • Acid Spray icon.png
    Armor reduction: 4/5/6/7
    Duration: 16
    Aura, affects enemies within the target area. The debuff lingers for 0.5 seconds.
  • Battle Hunger icon.png
    Enemy Armor Reduction: 0 (Upgradable by Aghanim's Scepter. Lua error: Error: No field named "value4_aghs" found for any of the specified database tables..)
  • Viscous Nasal Goo icon.png
    Base armor reduction: 2
    Armor reduction per stack: 1.4/1.9/2.4/2.9
    Max stacks: 4 (Upgradable by Aghanim's Scepter. Lua error: Error: No field named "value3_aghs" found for any of the specified database tables..)
    Hero Duration: 5
    Creep Duration: 10
    Affects the target enemy. Multiple casts increase the stack count, and refresh the duration of existing stacks.
  • Reality Rift icon.png
    Armor reduction: 3/4/5/6
    Duration: 6
    Affects the target enemy.
  • Bad Juju icon.png
    Armor reduction per cast: 2/2.25/2.5 (Talent 2.5/2.75/3)
    Duration: 8
    Affects nearby enemies whenever casting a spell. Multiple casts increase the stack count, and refresh the duration of existing stacks.
  • Melting Strike (Forged Spirit) icon.png
    Armor reduction per stack: 1 (Talent 3)
    Max stacks: 20 (Talent 60)
    Duration: 5
    Passive. Affects the attacked enemy. Multiple attacks increase the stack count, and refresh the duration of existing stacks.
  • Howl icon.png
    Armor reduction: 5/6/7/8
    Duration: 5/6/7/8
    Affects nearby enemies, and all enemies around each Lycan Wolf icon.png Lycan Wolf that is alive.
  • Rip Tide icon.png
    Armor reduction: 0% (Talent )
    Duration: 0
    Passive, has a chance to trigger on attacks. Affects nearby enemies.
  • Lucky Shot icon.png
    Armor reduction: 3/4/5/6
    Duration: 2/3/4/5
    Has a chance to proc on attack, affecting the attacked enemy.
  • Eye of the Storm icon.png
    Armor reduction per strike: 1
    Max duration: 30
    Strikes the lowest health enemy within range. Does not reduce armor of hit buildings. The armor duration of each strike is based on the storm's remaining duration.
  • Presence of the Dark Lord icon.png
    Armor reduction: 4/5/6/7 (Talent 8/9/10/11)
    Aura, affects nearby enemies. The debuff lingers for 0.5 seconds.
  • Corrosive Haze icon.png
    Armor reduction: 10/15/20 (Talent 14/19/24)
    Duration: 18
    Affects the target enemy.
  • Meld icon.png
    Armor reduction: 5/6/7/8 (Talent 8/9/10/11)
    Duration: 12
    Affects the attacked enemy.
  • Gush icon.png
    Armor reduction: 4/5/6/7 (Talent 8/9/10/11)
    Duration: 4
    Affects the target enemy (Upgradable by Aghanim's Scepter. affects all hit enemies).
  • Wave of Terror icon.png
    Armor reduction: 3/4/5/6 (Talent 4/5/6/7)
    Duration: 8
    Affects all hit enemies.
  • The Swarm icon.png
    Armor reduction per interval: 1 (Talent 1.4)
    Duration: 16
    Affects all hit enemies. The beetles reduce armor in 1.15/1.0/0.85/0.7 second intervals. The reduction lasts as long as the beetles do.
Armor reducing items

Armor Negating Abilities[edit]

Some abilities negate a unit's armor by reducing or increasing armor based on the unit's armor, effectively removing a percentage of the armor on the target. This Armor negation only affects the armor value of units, their armor type is unaffected and still reduces damage normally.

The following abilities negate armor:

Armor negating abilities
  • Marksmanship icon.png
    Main armor negation: 100%
    Has a chance to completely ignore the target's main armor value on attack, dealing damage as if they had 0 main armor.
  • Natural Order icon.png
    Main armor negation: 40%/60%/80%/100%
    Aura, affects nearby enemies. The reduction is based on the enemies' main armor. The debuff lingers for 1 second.

Armor Granting Talents[edit]

The following heroes have a talent that grants them bonus armor.

Bonus Level 10 Level 15 Level 20 Level 25
Left Right Left Right Left Right Left Right
Armor
  • Batrider minimap icon.png +4
  • Night Stalker minimap icon.png +4
  • Spirit Breaker minimap icon.png +4
  • Witch Doctor minimap icon.png +5
  • Bloodseeker minimap icon.png +6
  • Clockwerk minimap icon.png +4
  • Leshrac minimap icon.png +4
  • Pudge minimap icon.png +4
  • Silencer minimap icon.png +5
  • Underlord minimap icon.png +5
  • Bane minimap icon.png +6
  • Beastmaster minimap icon.png +6
  • Earthshaker minimap icon.png +6
  • Mars minimap icon.png +6
  • Anti-Mage minimap icon.png +8
  • Dark Seer minimap icon.png +6
  • Earth Spirit minimap icon.png +6
  • Warlock minimap icon.png +8
  • Abaddon minimap icon.png +8
  • Juggernaut minimap icon.png +8
  • Nature's Prophet minimap icon.png +8
  • Razor minimap icon.png +8
  • Tinker minimap icon.png +8

Besides these, the following heroes have talents which increase the armor of the units they summon

Armor Granting Items[edit]

Armor granting items
Item Value Item cost Cost per value point
Arcane Ring icon.png Arcane Ring 2 N/A N/A
Armlet of Mordiggian (Inactive) icon.png Armlet of Mordiggian 5 2475 495
Assault Cuirass icon.png Assault Cuirass 10 5075 507.5
Blade Mail icon.png Blade Mail 6 2225 370.83
Broom Handle icon.png Broom Handle 3 N/A N/A
Chainmail icon.png Chainmail 4 550 137.5
Cloak of Flames icon.png Cloak of Flames 4 N/A N/A
Crimson Guard icon.png Crimson Guard 6 3800 633.33
Dragon Scale icon.png Dragon Scale 5 N/A N/A
Ex Machina icon.png Ex Machina 25 N/A N/A
Guardian Greaves icon.png Guardian Greaves 4 5250 1312.5
Helm of Iron Will icon.png Helm of Iron Will 5 925 185
Helm of the Dominator icon.png Helm of the Dominator 1 6 2350 391.67
Helm of the Dominator 2 icon.png Helm of the Dominator 2 8 6000 750
Lotus Orb icon.png Lotus Orb 10 3950 395
Medallion of Courage icon.png Medallion of Courage 5 1025 205
Mekansm icon.png Mekansm 4 1875 468.75
Nullifier icon.png Nullifier 8 4725 590.63
Phase Boots icon.png Phase Boots 4 1500 375
Platemail icon.png Platemail 10 1400 140
Ring of Protection icon.png Ring of Protection 2 175 87.5
Shiva's Guard icon.png Shiva's Guard 15 4850 323.33
Solar Crest icon.png Solar Crest 8 3725 465.63
Soul Ring icon.png Soul Ring 2 740 370
Spirit Vessel icon.png Spirit Vessel 2 2940 1470
Urn of Shadows icon.png Urn of Shadows 2 840 420
Witch Blade icon.png Witch Blade 6 2600 433.33
Wraith Band icon.png Wraith Band 1.5 510 340

Damage Multiplier[edit]

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

For any real-valued armor, the damage multiplier is defined as

With DM being the index of Damage Multiplier and RM being the index of Main Armor.

The damage multiplier limits are 2 and 0, for infinitely negative and positive armor, respectively.

Examples
Armor (+) Multiplier Armor (-) Multiplier
1 94% -1 106%
2 89% -2 111%
3 85% -3 115%
4 81% -4 119%
5 77% -5 123%
6 74% -6 126%
7 70% -7 130%
8 68% -8 132%
9 65% -9 135%
10 63% -10 138%
11 60% -11 140%
12 58% -12 142%
13 56% -13 144%
14 54% -14 146%
15 53% -15 147%
16 51% -16 149%
17 50% -17 150%
18 48% -18 152%
19 47% -19 153%
20 45% -20 155%
21 44% -21 156%
22 43% -22 157%
23 42% -23 158%
24 41% -24 159%
25 40% -25 160%
26 39% -26 161%
27 38% -27 162%
28 37% -28 163%
29 36% -29 164%
30 36% -30 164%
31 35% -31 165%
32 34% -32 166%
33 34% -33 166%
34 33% -34 167%
35 32% -35 168%
36 32% -36 168%
37 31% -37 169%
38 30% -38 170%
39 30% -39 170%
40 29% -40 171%
41 29% -41 171%
42 28% -42 172%
43 28% -43 172%
44 27% -44 173%
45 27% -45 173%

Effective HP[edit]

Relationships between effective HP%, damage multiplier and armor

The total amount of physical damage a unit can take due to the armor it has is known as effective HP (or EHP). 16.66 armor adds 100% to EHP. This means a unit with 1000 health and 16.66 armor can take 2000 physical damage. The formula adds 6% EHP per point of armor regardless of the previous armor value.

However, EHP value is of a diminished benefit as a player gaining 1 armor from 0 armor would increase EHP from 100% to 106%, while a player gaining 1 armor from 50 armor would increase EHP from 400% to 406%. On the other hand, the effectiveness of armor is much lower at negative values (refer to graph). Total EHP trends downwards towards 50%, meaning a unit with 1000 health and infinitely low armor would still be able to take 500 physical damage. At this point, losing or gaining 1 armor has essentially no effect.

Armor -40 -30 -20 -10 0 10 20 30 40
Effective HP 586.21 608.7 647.06 727.27 1000 1600 2200 2800 3400

This definition of EHP assumes all damage taken is physical. EHP against magical damage (such as Lina minimap icon.png Lina's or Lion minimap icon.png Lion's ultimate) is modified by magic resistance.

Effective HP against physical damage is defined as

With C being the index of Current Health and D being the index of Damage Manipulation.

Example 1
A Level 25 Sven minimap icon.png Sven has a total health of 2176 and 12.5 points of armor. What is his effective HP against physical damage?


Sven minimap icon.png Sven's effective HP against physical damage in this example is 3808.
Example 2
The same Level 25 Sven minimap icon.png Sven from previous example (has a total health of 2176) is affected by a Level 3 Corrosive Haze, and his armor is now -7.5. What is his effective HP against physical damage?


Sven minimap icon.png Sven's effective HP against physical damage in this example is 1660.63.

Armor Types[edit]

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.

Attack damage dealt against armor type is defined as

With A being the index of Attack Damage, D being the index of Damage Multipler and R being the index of Armor Type Multiplier.

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 Armor Type Multiplier (R)
Hero Basic Pierce Siege
Hero Death Ward, Earth, Familiar, Fire, Roshan, Spirit Bear, Storm, Tempest Double, Void, Warlock Golem 100% 75% 50% 100%
Basic Alpha Wolf, Ancient Black Dragon, Ancient Black Drake, Ancient Granite Golem, Ancient Prowler Acolyte, Ancient Prowler Shaman, Ancient Rock Golem, Ancient Rumblehide, Ancient Thunderhide, Animal Courier, Astral Spirit, Beetle, Boar, Centaur Conqueror, Centaur Courser, Courier, Dark Troll Summoner, Eidolon, Fell Spirit, Flying Courier, Forged Spirit, Frozen Sigil, Ghost, Giant Wolf, Greater Treant, Harpy Scout, Harpy Stormcrafter, Hawk, Healing Ward, Hellbear Smasher, Hellbear, Hill Troll Berserker, Hill Troll Priest, Hill Troll, Homing Missile, Ice Spire, Ignis Fatuus, Kobold Foreman, Kobold Soldier, Kobold, Lycan Lane Wolf, Lycan Wolf, Mega Melee Creep, Mega Ranged Creep, Melee Creep, Mud Golem, Necronomicon Archer, Necronomicon Warrior, Nether Ward, Nimbus, Observer Ward, Ogre Bruiser, Ogre Frostmage, Phantom, Phoenix Sun, Plague Ward, Power Cog, Proximity Mine, Psionic Trap, Ranged Creep, Remote Mine, Satyr Banisher, Satyr Mindstealer, Satyr Tormenter, Sentry Ward, Serpent Ward, Shard Golem, Skeleton Archer, Skeleton Warrior, Spiderite, Spiderling, Spin Web, Stasis Trap, Super Melee Creep, Super Ranged Creep, Tombstone, Tornado, Treant, Undying Zombie, Vhoul Assassin, Wildwing Ripper, Wildwing, Wraith King Skeleton 100% 100% 150% 100%
Structure Ancient, Effigy Building, Fountain, Melee Barracks, Outpost, Ranged Barracks, Siege Creep, Super Siege Creep, Tier 1 Tower, Tier 2 Tower, Tier 3 Tower, Tier 4 Tower 50% 70% 35% 250%
Example 1
Sven minimap icon.png Sven with 100 damage attacks a siege creep which has 0 armor and deals 50 damage to it. 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 gained 5 armor, how much the 100 damage attack would deal?
Siege Creep's Base Armor for this example is 5.
The siege creep damage multiplier is 0.76923.


The armor type multiplier is 0.5 because the attack type "hero" deals 50% less damage against the armor type "structure".
Therefore in this example, Sven minimap icon.png Sven's 100 damage attack to the siege creep with 5 armor would be 38.4615. The same attack would deal 76.923 damage to a unit with any other armor type, since attack type hero deals full damage to them.

Trivia[edit]

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.
  • In DotA 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 minimap icon.png Visage) or 65% (Meepo minimap icon.png Meepo). Nowadays, in Dota 2 magic resistance works independently from armor.
  • In 6.86 Armor types were renamed and some other types were removed.
    • The following armor types were renamed: Unarmored ➜ Soft, Light ➜ Weak, Medium ➜ Basic, Heavy ➜ Strong and Fortified ➜ Structure.
    • Weak and Basic armor types were removed. Units who previously uses the Weak and Basic armor type now use the Soft and Strong armor type respectively.

Negative Armor Disparity[edit]

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 defined as

With a being the index of armor.

Comparison table

Recent Changes[edit]

Main Article: Armor/Changelogs

References[edit]