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Magic resistance

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Null Field icon.png
Magic resistance is an attribute of heroes, similar to armor. Instead of reducing physical damage, it reduces magical damage. All heroes, except Meepo and Visage, possess 25% magic resistance from their armor type. This percentage is completely independent of their amount of armor. Certain Hero summons, such as Enigma's Eidolons, also possess intrinsic magic resistance.

Magical damage[edit]

Main Article: Damage types

Magical damage is a special damage type caused mostly by abilities. Unlike physical damage, it is not affected by armor. However, it is affected by magic resistance dealing more or less damage, depending on the unit's current magic resistance. Besides magic resistance, magical damage, just like physical and pure damage, is also affected by damage manipulation.

Mechanics[edit]

All Heroes have a basic 25% magic resistance, except for Meepo and his clones, who have 35% and Visage, who has 10%. This means that, by default, for most heroes, all magical damage is reduced by 25%, or only 75% of the ability's damage is dealt. Most non-hero units have a 0% base magic resistance.

Stacking[edit]

There are multiple abilities and items which can increase a unit's magic resistance. These bonuses stack diminishinly, means the higher a unit's magic resistance currently is, the lower the effects of another bonus will be, making it impossible to reach 100% magic resistance. It is also possible to reduce a unit's magic resistance with the help of several abilities. These reductions also stack diminishingly, means the higher a unit's magic resistance is, the less effective magic resistance reductions will get.

Example: The following table shows the diminishing effectiveness of multiple Hood of Defiance icon.png Hood of Defiance on a hero with 25% base magic resistance. As seen in the table, when acquiring 6 hoods, the 6th hood only effectively grants about 3.7% magic resistance, making it about 6 times less effective than the first acquired hood.

Number of Hoods Total magic resistance Effectiveness of last hood
No hood 25%
1 hood 47.5% 22.5%
2 hoods 63.25% 15.75%
3 hoods 74.275% 11.025%
4 hoods 81.9925% 7.7175%
5 hoods 87.39475% 5.40225%
6 hoods 91.176325% 3.781575%

Formula for magical damage after magic resistance reductions/amplifications:

Actual damage = magical damage × (1 − natural resistance) × (1 − first resistance bonus) × (1 − second resistance bonus) × (1 + first resistance reduction) × (1 + second resistance reduction)

Formula for total magic resistance of a unit (mutliply the result by 100 to get the percentage value):

Total magic resistance = 1 − (1 − natural resistance) × (1 − first ristance bonus) × (1 − second resistance bonus) × (1 + first resistance reduction) × (1 + second resistance reduction)

100% magic resistance[edit]

As one can conclude from the stacking rules above, it is not possible to reach 100% magic resistance. However, there are several abilities which grant 100% magic resistance. Because of the stacking rules, this abilities prevent a unit's magic resistance to be reduced, as the formula will always result in 100%, no matter how big the magic resistance reduction.

Formula example with one magic resistance source being a 100% bonus:

magical damage × (1 − natural resistance) × (1 − 1) × (1 + first resistance reduction) × (1 + second resistance reduction) = 0 total magical damage
(1 − (1 − natural resistance) × (1 − 1) × (1 + first resistance reduction) × (1 + second resistance reduction)) × 100 = 100% magic resistance

Magic resistance on units[edit]

Unit No items or abilities With Cloak icon.png Cloak With Hood of Defiance icon.png Hood of Defiance
or Pipe of Insight icon.png Pipe of Insight
With ability
(at max)
With ability and Cloak icon.png Cloak With ability and Hood of Defiance icon.png Hood of Defiance
or Pipe of Insight icon.png Pipe of Insight
Standard Hero 25% 36.25% 47.5% - - -
Meepo icon.png Meepo 35% 44.75% 54.5% - - -
Visage icon.png Visage 10% 23.5% 37% 67.6% 72.46% 77.32%
Anti-Mage icon.png Anti-Mage 25% 36.25% 47.5% 62.5% 68.15% 73.75%
Viper icon.png Viper 25% 36.25% 47.5% 43.75% 52.19% 60.63%
Rubick icon.png Rubick 25% 36.25% 47.5% 40% 49% 58%
Pudge icon.png Pudge 25% 36.25% 47.5% 34% 43.9% 53.8%
Enigma icon.png Enigma's Eidolons 50% - - - - -
Lycan icon.png Lycan's Wolves 80% - - - - -
Necronomicon icon.png Necronomicon summons 40% - - - - -
Warlock icon.png Warlock's Golem 33% - - - - -

Sources of Magic Resistance Bonus[edit]

Anti-Mage - Spell Shield
Spell Shield icon.png
Magic Resistance Bonnus: 26%/34%/42%/50%
Cloak
Cost 550
Cloak icon.png
Magic Resistance Bonus: 15%
Hood of Defiance
Cost 2125
Hood of Defiance icon.png
Magic Resistance Bonus: 30%
Huskar - Berserker's Blood
Berserker's Blood icon.png
Magic Resistance Bonus per Stack: 4%/5%/6%/7%
First stack is gained at 100% 87% of Huskar's maximum health. Each following stack is added for each 7% max health missing.
Pipe of Insight
Cost 3525
Pipe of Insight icon.png
Magic Resistance Bonus: 30%
Pudge - Flesh Heap
Flesh Heap icon.png
Magic Resistance Bonus: 6%/8%/10%/12%
Rubick - Null Field
Null Field icon.png
Magic Resistance Bonus: 5%/10%/15%/20%
Radius: 900
Is an aura, affecting all nearby allies.
Lone Druid - Spirit Bear - Demolish
Demolish icon.png
Magic Resistance Bonus: 33%
Viper - Corrosive Skin
Corrosive Skin icon.png
Magic Resistance Bonus: 10%/15%/20%/25%
Visage - Gravekeeper's Cloak
Gravekeeper's Cloak icon.png
Magic Resistance Bonus per Layer: 3%/6%/12%/16%
Max Layers: 4
Layer Recharge Time: 6
If Visage receives damage from a player, one layer is removed, and takes time to recover.

Sources of Magic Resistance Reduction[edit]

Ancient Apparition - Ice Vortex
Ice Vortex icon.png
Magic Resistance Reduction: 15%/20%/25%/30%
Radius: 275
Vortex Duration: 16
The effect lingers for 0.5 seconds after leaving the affected area.
Elder Titan - Natural Order
Natural Order icon.png
Magic Resistance Reduction: 12%/19%/26%/33%
Radius: 275
The aura's debuff lingers for 0.5 seconds after getting out of range.
Ethereal Blade - Ether Blast
Cost 4900
Ethereal Blade icon.png
Magic Resistance Reduction: 40%
Enemy Duration: 3
Ally Duration: 4
Does not stack with the reduction of Ghost Scepter icon.png Ghost Scepter and Decrepify icon.png Decrepify, the one with higher value takes priority.
Ghost Scepter - Ghost Form
Cost 1600
Ghost Scepter icon.png
Magic Resistance Reduction: 40%
Duration: 4
Does not stack with the reduction of Ghost Scepter icon.png Ghost Scepter and Decrepify icon.png Decrepify, the one with higher value takes priority.
Pugna - Decrepify
Decrepify icon.png
Enemy Magic Resistance Reduction: 50%
Ally Magic Resistance Reduction: 25%
Duration: 2/2.5/3/3.5
Does not stack with the reduction of Ghost Scepter icon.png Ghost Scepter and Decrepify icon.png Decrepify, the one with higher value takes priority.
Skywrath Mage - Ancient Seal
Ancient Seal icon.png
Magic Resistance Reduction: 30%/35%/40%/45%
Duration: 3/4/5/6
Veil of Discord - Magic Weakness
Cost 2670
Veil of Discord icon.png
Magic Resistance Reduction: 25%
Duration: 25

Sources of 100% magic resistance[edit]

These abilities grant 100% magic resistance to the affected units, reducing every magical damage they take to 0, and ceasing the effects of magic resistance reductions.

Black King Bar - Avatar
Cost 3975
Black King Bar icon.png
Duration: 10/9/8/7/6/5 (decreased by each use)
Brewmaster - Earth - Spell Immunity
Spell Immunity (Brewmaster) icon.png
Duration: Permanent
Huskar - Life Break
Life Break icon.png
Duration: Whole leap duration or up to 1 second, whichever is shorter
Juggernaut - Blade Fury
Blade Fury icon.png
Duration: 5
Juggernaut - Omnislash
Omnislash icon.png
Duration: 0.8/2/3.2 (2/3.2/4.4*)
Provides immunity until Omnislash stops. Does not dispel any buffs and debuffs.
Lifestealer - Rage
Rage icon.png
Duration: 3/4/5/6
Medusa - Stone Gaze
Stone Gaze icon.png
Duration: 3
The affected unit's hud does not reflect the bonus granted by Stone Gaze.
Non-Hero Units - Spell Immunity
Spell Immunity icon.png
Duration: Permanent
Omniknight - Repel
Repel icon.png
Duration: 6/8/10/12
Note: Can be purged.
Oracle - Fate's Edict
Fate's Edict icon.png
Duration: 3/4/5/6

Magical damage barrier[edit]

A magical damage barrier absorbs a set amount of magical damage. It absorbs the damage before it is reduced by magic resistance, unless the resistance is provided by spell immunity.

This means that when for example a hero with a 25% magic resistance and a 300 health damage barrier gets hit by 400 magical damage, the shield will absorb 300 of that. The exceeding 100 are not absorbed and are now reduced by the 25% magic resistance down to 75. So in this scenario, the hero takes 75 damage. This means a barrier is more effective the lower a unit's magic resistance is, similar to how damage block is more effective, the lower the armor is.

Sources of magic damage barriers[edit]

Ember Spirit - Flame Guard
Flame Guard icon.png
Barrier Health: 50/200/350/500
Duration: 8/12/16/20
Pipe of Insight - Barrier
Cost 3525
Pipe of Insight icon.png
Barrier Health: 400
Duration: 12

See also[edit]