Armor

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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 (with agility heroes gaining more than other heroes), talents, certain items, and some abilities. Armor of any unit can also be temporarily increased or reduced with some abilities.

Each point of agility increases a hero's armor by 0.16.

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
Drow Ranger, Puck -3
Arc Warden, Brewmaster, Lone Druid, Monkey King, Morphling, Pudge, Skywrath Mage, Viper, Visage -2
Abaddon, Alchemist, Ancient Apparition, Anti-Mage, Axe, Beastmaster, Chen, Crystal Maiden, Dark Willow, Dazzle, Doom, Ember Spirit, Huskar, Keeper of the Light, Lich, Lion, Lycan, Mars, Medusa, Mirana, Phoenix, Razor, Sand King, Silencer, Sniper, Timbersaw, Treant Protector, Troll Warlord, Windranger, Winter Wyvern, Witch Doctor, Wraith King -1
Batrider, Broodmother, Centaur Warrunner, Clinkz, Clockwerk, Death Prophet, Disruptor, Dragon Knight, Earth Spirit, Elder Titan, Faceless Void, Grimstroke, Invoker, Juggernaut, Legion Commander, Leshrac, Luna, Oracle, Phantom Lancer, Pugna, Queen of Pain, Rubick, Shadow Demon, Shadow Fiend, Slark, Spectre, Tidehunter, Tiny, Tusk, Vengeful Spirit, Venomancer, Weaver 0
Bane, Bristleback, Chaos Knight, Enchantress, Io, Jakiro, Kunkka, Lifestealer, Lina, Magnus, Necrophos, Nyx Assassin, Pangolier, Phantom Assassin, Shadow Shaman, Sven, Templar Assassin, Undying, Ursa, Warlock, Zeus 1
Outworld Devourer 1.5
Bloodseeker, Earthshaker, Enigma, Gyrocopter, Nature's Prophet, Night Stalker, Omniknight, Snapfire, Spirit Breaker, Storm Spirit, Tinker 2
Void Spirit 2.66
Bounty Hunter, Dark Seer, Meepo, Naga Siren, Riki, Slardar, Underlord 3
Techies 5
Ogre Magi 6
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 Wolf, Spiderite, Spiderling, Treant, Undying Zombie 0
Familiar 0/1/2
Forged Spirit 0/1/2/3/4/5/6
Fire 0/3/6
Skeleton Warrior, Wraith King Skeleton 1
Storm 2
Eidolon 2/3/4/5
Earth 3
Spirit Bear 3/4/5/6
Necronomicon Archer, Necronomicon Warrior 4
Hawk 5
Warlock's 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, which is gained by leveling up, acquiring certain items, or with the help of certain abilities.

The formula to calculate a hero's main armor is:

main armor = base armor + agility * 0.16

Hero Armor
Hero Base Armor Starting Armor Max Main Armor
Abaddon icon.png Abaddon -1 2.68 8.44
Alchemist icon.png Alchemist -1 2.52 7.13
Ancient Apparition icon.png Ancient Apparition -1 2.2 10.65
Anti-Mage icon.png Anti-Mage -1 2.84 14.36
Arc Warden icon.png Arc Warden -2 0.4 9.62
Axe icon.png Axe -1 2.2 10.65
Bane icon.png Bane 1 4.68 14.66
Batrider icon.png Batrider 0 2.4 8.16
Beastmaster icon.png Beastmaster -1 1.88 8.02
Bloodseeker icon.png Bloodseeker 2 5.52 18.58
Bounty Hunter icon.png Bounty Hunter 3 6.36 16.34
Brewmaster icon.png Brewmaster -2 1.52 9.2
Bristleback icon.png Bristleback 1 3.72 10.63
Broodmother icon.png Broodmother 0 2.4 13.15
Centaur Warrunner icon.png Centaur Warrunner 0 2.4 6.24
Chaos Knight icon.png Chaos Knight 1 3.24 8.62
Chen icon.png Chen -1 1.4 9.46
Clinkz icon.png Clinkz 0 3.52 13.89
Clockwerk icon.png Clockwerk 0 2.08 10.91
Crystal Maiden icon.png Crystal Maiden -1 1.56 7.7
Dark Seer icon.png Dark Seer 3 4.92 11.83
Dark Willow icon.png Dark Willow -1 1.88 8.02
Dazzle icon.png Dazzle -1 2.36 8.89
Death Prophet icon.png Death Prophet 0 2.24 7.62
Disruptor icon.png Disruptor 0 2.4 7.78
Doom icon.png Doom -1 0.76 4.22
Dragon Knight icon.png Dragon Knight 0 3.04 10.72
Drow Ranger icon.png Drow Ranger -3 0.2 11.34
Earth Spirit icon.png Earth Spirit 0 2.72 8.48
Earthshaker icon.png Earthshaker 2 3.92 9.3
Elder Titan icon.png Elder Titan 0 2.24 9.15
Ember Spirit icon.png Ember Spirit -1 2.52 12.5
Enchantress icon.png Enchantress 1 4.04 10.95
Enigma icon.png Enigma 2 4.24 8.08
Faceless Void icon.png Faceless Void 0 3.68 15.2
Grimstroke icon.png Grimstroke 0 2.88 10.18
Gyrocopter icon.png Gyrocopter 2 5.04 18.86
Huskar icon.png Huskar -1 1.4 6.78
Invoker icon.png Invoker 0 2.24 9.54
Io icon.png Io 1 3.24 9.38
Jakiro icon.png Jakiro 1 2.6 7.21
Juggernaut icon.png Juggernaut 0 5.44 16.19
Keeper of the Light icon.png Keeper of the Light -1 1.4 7.54
Kunkka icon.png Kunkka 1 3.24 8.23
Legion Commander icon.png Legion Commander 0 2.88 9.41
Leshrac icon.png Leshrac 0 3.68 12.51
Lich icon.png Lich -1 1.4 9.08
Lifestealer icon.png Lifestealer 1 3.88 13.1
Lina icon.png Lina 1 4.68 11.59
Lion icon.png Lion -1 1.4 7.16
Lone Druid icon.png Lone Druid -2 1.2 11.95
Luna icon.png Luna 0 2.88 16.7
Lycan icon.png Lycan -1 1.56 5.4
Magnus icon.png Magnus 1 3.4 13
Mars icon.png Mars -1 2.2 9.5
Medusa icon.png Medusa -1 2.52 16.34
Meepo icon.png Meepo 3 6.84 13.75
Mirana icon.png Mirana -1 1.88 16.09
Monkey King icon.png Monkey King -2 1.52 15.73
Morphling icon.png Morphling -2 1.84 18.35
Naga Siren icon.png Naga Siren 3 6.36 19.8
Nature's Prophet icon.png Nature's Prophet 2 5.52 19.34
Necrophos icon.png Necrophos 1 2.92 7.91
Night Stalker icon.png Night Stalker 2 4.88 13.71
Nyx Assassin icon.png Nyx Assassin 1 4.04 13.64
Ogre Magi icon.png Ogre Magi 6 8.24 15.54
Omniknight icon.png Omniknight 2 4.4 11.31
Oracle icon.png Oracle 0 2.4 8.93
Outworld Devourer icon.png Outworld Devourer 1.5 5.34 13.02
Pangolier icon.png Pangolier 1 3.88 16.17
Phantom Assassin icon.png Phantom Assassin 1 4.68 17.74
Phantom Lancer icon.png Phantom Lancer 0 4.64 16.93
Phoenix icon.png Phoenix -1 0.92 5.91
Puck icon.png Puck -3 0.52 8.97
Pudge icon.png Pudge -2 0.24 6
Pugna icon.png Pugna 0 2.56 7.55
Queen of Pain icon.png Queen of Pain 0 3.52 13.12
Razor icon.png Razor -1 2.52 10.58
Riki icon.png Riki 3 5.88 11.26
Rubick icon.png Rubick 0 3.68 13.28
Sand King icon.png Sand King -1 2.04 8.95
Shadow Demon icon.png Shadow Demon 0 2.88 11.33
Shadow Fiend icon.png Shadow Fiend 0 3.2 16.64
Shadow Shaman icon.png Shadow Shaman 1 3.56 9.7
Silencer icon.png Silencer -1 2.52 11.74
Skywrath Mage icon.png Skywrath Mage -2 0.08 3.15
Slardar icon.png Slardar 3 5.72 14.94
Slark icon.png Slark 0 3.36 9.89
Snapfire icon.png Snapfire 2 4.56 11.86
Sniper icon.png Sniper -1 2.36 15.42
Spectre icon.png Spectre 0 3.68 11.74
Spirit Breaker icon.png Spirit Breaker 2 4.72 11.25
Storm Spirit icon.png Storm Spirit 2 5.52 11.28
Sven icon.png Sven 1 4.36 12.04
Techies icon.png Techies 5 7.24 12.23
Templar Assassin icon.png Templar Assassin 1 4.68 16.97
Terrorblade icon.png Terrorblade 7 10.52 28.95
Tidehunter icon.png Tidehunter 0 2.4 8.16
Timbersaw icon.png Timbersaw -1 1.56 7.7
Tinker icon.png Tinker 2 4.08 8.69
Tiny icon.png Tiny 0 0 0
Treant Protector icon.png Treant Protector -1 1.4 9.08
Troll Warlord icon.png Troll Warlord -1 2.36 15.03
Tusk icon.png Tusk 0 3.68 11.74
Underlord icon.png Underlord 3 4.92 11.06
Undying icon.png Undying 1 2.6 5.67
Ursa icon.png Ursa 1 3.88 13.1
Vengeful Spirit icon.png Vengeful Spirit 0 3.2 17.79
Venomancer icon.png Venomancer 0 4.16 16.45
Viper icon.png Viper -2 1.36 10.96
Visage icon.png Visage -2 -0.24 4.75
Void Spirit icon.png Void Spirit 2.66 5.7 14.15
Warlock icon.png Warlock 1 2.6 6.44
Weaver icon.png Weaver 0 2.24 16.06
Windranger icon.png Windranger -1 1.72 7.1
Winter Wyvern icon.png Winter Wyvern -1 1.56 8.86
Witch Doctor icon.png Witch Doctor -1 1.08 6.46
Wraith King icon.png Wraith King -1 1.88 8.41
Zeus icon.png Zeus 1 2.76 7.37

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 item or skill shows a +armor value, e.g. Blade Mail icon.png Blade Mail (+5 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 spells like Natural Order also only affect main armor.

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

damage multiplier = 1 - ((0.052 × armor) ÷ (0.9 + 0.048 × |armor|)).

The damage multiplier limits are 25/12 (roughly 2.08) and 0, for infinitely negative and positive armor, respectively.

Examples
Armor (+) Multiplier Armor (-) Multiplier
1 95% -1 105%
2 90% -2 110%
3 85% -3 115%
4 81% -4 119%
5 77% -5 123%
6 74% -6 126%
7 71% -7 129%
8 68% -8 132%
9 65% -9 135%
10 62% -10 138%
11 60% -11 140%
12 58% -12 142%
13 56% -13 144%
14 54% -14 146%
15 52% -15 148%
16 50% -16 150%
17 48% -17 152%
18 47% -18 153%
19 45% -19 155%
20 44% -20 156%
21 43% -21 157%
22 42% -22 158%
23 40% -23 160%
24 39% -24 161%
25 38% -25 162%
26 37% -26 163%
27 36% -27 164%
28 35% -28 165%
29 34% -29 166%
30 33% -30 167%
31 32% -31 168%
32 32% -32 168%
33 31% -33 169%
34 30% -34 170%
35 29% -35 171%
36 29% -36 171%
37 28% -37 172%
38 27% -38 173%
39 27% -39 173%
40 26% -40 174%
41 26% -41 174%
42 25% -42 175%
43 25% -43 175%
44 24% -44 176%
45 24% -45 176%

Effective HP[edit]

Relationships between effective HP%, damage multiplier and armor

The total damage a unit can take due to armor is known as its effective HP (or EHP) for physical damage. At 0 armor, 1 armor adds roughly 5.5% to EHP. This means a unit with 1000 health and 1 armor can take 1054 physical damage. At 30 armor, this figure scales upwards to 7.7%, meaning armor is more effective at higher values.

On the other hand, the effectiveness of armor is much lower at negative values (see graph). Total effective HP trends downwards towards 48%, meaning a unit with 1000 health and infinitely low armor would still be able to take 480 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 575.51 600 641.38 726.32 1000 1604.65 2268.29 3000 3810.81

This definition of effective HP assumes all damage taken is physical. In Dota 2, magical damage (such as Lina minimap icon.png Lina's or Lion minimap icon.png Lion's ultimate) is modified by magic resistance.

Calculating effective HP
effective HP = current HP ÷ damage multiplier
Example 1
A level 25 Sven minimap icon.png Sven has a total HP of 2176 and 12.04 points of armor. What is his effective HP vs physical damage?
EHP = 2176 ÷ ( 1 - (12.04 × 0.052) ÷ (0.9 + 12.04 × 0.048) ) = 2176 ÷ 0.576378 = 3775.3
Sven can tank 3775.3 physical damage.


Example 2
The same Sven from previous example is hit by a maxed Corrosive Haze. His armor is now -7.96. What is his effective HP vs physical damage?
EHP = 2176 ÷ ( 1 - (-7.96 × 0.052) ÷ (0.9 + 7.96 × 0.048) ) = 2176 ÷ 1.32285 = 1644.93
Sven can tank 1644.93 physical damage.

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.

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 * 0.7719298245614 * 0.5) = 38.59649122807 damage. The same attack would deal 77.19298245614 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 Death Ward, Earth, Familiar, Fire, Roshan, Spirit Bear, Storm, Warlock's 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, 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, Ignis Fatuus, Kobold Foreman, Kobold Soldier, Kobold, 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, Tempest Double, 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, Shrine, Siege Creep, Super Siege Creep, Tier 1 Tower, Tier 2 Tower, Tier 3 Tower, Tier 4 Tower 50% 70% 35% 250%

Modifying armor[edit]

A lot of abilites and items have abilities that grant or reduce armor. These changes are always 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]

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.
  • Viscous Nasal Goo icon.png
    Base armor reduction: 2
    Armor reduction per stack: 1.4/1.9/2.4/2.9
    Max stacks: 4 (Talent 10)
    Affects the target enemy. Multiple casts increase the stack count, and refresh the duration of existing stacks.
  • 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
    Max stacks: 10
    Duration: 5
    Passive. Affects the attacked enemy. Multiple attacks increase the stack count, and refresh the duration of existing stacks.
  • Rip Tide icon.png
    Armor reduction: 2/4/6/8 (Talent 8/10/12/14)
    Duration: 4
    Passive, has a chance to trigger on attacks. Affects nearby enemies.
  • Armor Corruption icon.png
    Armor reduction: 4
    Duration: 10
    Requires a Talent talent. Affects the attacked enemy.
  • Eye of the Storm icon.png
    Armor reduction per strike: 1
    Max duration: 40/55/70
    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 9/10/11/12)
    Aura, affects nearby enemies. The debuff lingers for 0.5 seconds.
  • Corrosive Haze icon.png
    Armor reduction: 10/15/20
    Duration: 18
    Affects the target enemy.
  • Meld icon.png
    Armor reduction: 2/4/6/8 (Talent 6/8/10/12)
    Duration: 12
    Affects the attacked enemy.
  • Gush icon.png
    Armor reduction: 4/5/6/7 (Talent 9/10/11/12)
    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 1.5)
    Duration: 16
    Affects all hit enemies. The beetles reduce armor in 1.25/1.1/0.95/0.8 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
  • Desecrate (Ancient Prowler Shaman) icon.png
    Main armor negation: 50%
    Duration: 6
    Affects nearby enemies on cast. The reduction is based on the enemies' main armor.
  • 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 seconds.

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 +5
  • Spirit Breaker minimap icon.png +5
  • Bloodseeker minimap icon.png +6
  • Kunkka minimap icon.png +6
  • Witch Doctor minimap icon.png +6
  • Clockwerk minimap icon.png +5
  • Leshrac minimap icon.png +5
  • Lycan minimap icon.png +5
  • Silencer minimap icon.png +6
  • Bane minimap icon.png +7
  • Outworld Devourer minimap icon.png +6
  • Earthshaker minimap icon.png +7
  • Mars minimap icon.png +8
  • Nature's Prophet minimap icon.png +10
  • Beastmaster minimap icon.png +7
  • Abaddon minimap icon.png +8
  • Earth Spirit minimap icon.png +8
  • Io minimap icon.png +15
  • Dark Seer minimap icon.png +10
  • Juggernaut minimap icon.png +10
  • Magnus minimap icon.png +10
  • Razor minimap icon.png +10
  • Sand King minimap icon.png +10
  • Tinker minimap icon.png +10

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

Armor granting items[edit]

These items grant bonus armor to the hero who has them equipped.

Armor granting items
Item Value Item cost Cost per value point
Arcane Ring icon.png Arcane Ring 3 N/A N/A
Armlet of Mordiggian (Inactive) icon.png Armlet of Mordiggian 5 2380 476
Assault Cuirass icon.png Assault Cuirass 10 5150 515
Blade Mail icon.png Blade Mail 6 2200 366.67
Broom Handle icon.png Broom Handle 3 N/A N/A
Chainmail icon.png Chainmail 4 550 137.5
Craggy Coat icon.png Craggy Coat 13 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 6 4950 825
Helm of Iron Will icon.png Helm of Iron Will 5 900 180
Helm of the Undying icon.png Helm of the Undying 6 N/A N/A
Iron Talon icon.png Iron Talon 2 N/A N/A
Lotus Orb icon.png Lotus Orb 10 4000 400
Medallion of Courage icon.png Medallion of Courage 5 1100 220
Mekansm icon.png Mekansm 6 1950 325
Nullifier icon.png Nullifier 5 4700 940
Phase Boots icon.png Phase Boots 4 1480 370
Platemail icon.png Platemail 10 1400 140
Ring of Protection icon.png Ring of Protection 2 150 75
Shiva's Guard icon.png Shiva's Guard 15 4750 316.67
Solar Crest icon.png Solar Crest 8 3900 487.5
Spirit Vessel icon.png Spirit Vessel 2 2965 1482.5
Urn of Shadows icon.png Urn of Shadows 2 865 432.5

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). Nowdays in Dota 2 magic resistance works independently from armor.
  • The Basic armor type was referred to as Medium armor in DotA.
  • The deprecated Light damage type used to be called Chaos damage in DotA.
  • The deprecated Weak armor type used be called Light armor, Soft was referred to as Unarmored, and Strong was known as Heavy armor type.

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 calculated from this formula:

Damage increase = 1 - 0.94^(-armor)

Comparison table

Update history[edit]

Version
Description
  • Siege damage against heroes increased from 85% to 100%.
  • Changed the Armor formula from ( 0.05 * Armor ) / ( 1 + 0.05 * Armor ) to ( 0.052 * Armor ) / ( 0.9 + 0.048 * Armor )
  • Changed the Armor formula from ( 0.06 * Armor ) / ( 1 + 0.06 * Armor ) to ( 0.05 * Armor ) / (1 + 0.05 * Armor )
  • Armor per agility rescaled from 1/7 to 1/6.
  • Fixed the armor damage multiplier being 0.07 since 7.06, instead of 0.06.
  • Armor now shows decimal places in the hover tooltip
  • Changed piercing damage to heavy armor to 75% from 100%.
  • Chaos damage now does 40% damage to fortified (down from 50%).
  • Chaos Damage now does same as hero damage to structures, 50% instead of 100%.

References[edit]