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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.

Contents

[edit] Magical Damage

Main Article: Damage types

Magical damage is a special damage type caused mostly by abilities. Unlike physical damage, it isn't reduced by armor. However, it is reduced by magic resistance, and will not affect targets that are magic immune or buildings that are fortified. Ethereal units will also take 40% amplified magical damage.

Mixed damage is similar to magical damage. It is reduced by magic resistance and armor, but ignores magic immunity. Mixed damage does not affect ethereal units.

[edit] Damage Reduction

All Heroes have a natural 25% magic resistance,[1] except for Meepo and his clones, who have 35%[2] and Visage, who has 10%.[3] This means that, by default, for most heroes, all magical damage is reduced by 25%, or only 75% of the ability's damage. Any additional effects, such as the bonus given by Hood of Defiance, will reduce the remaining damage by their resistance.

Actual damage = magical damage × (1 + magic amplification) × (1 + second souce of magic amplification ) × (1 − natural resistance) × (1 − magic resistance of item) × (1 − magic resistance of first ability) × (1 − magic resistance of second ability)

In the formula above, natural resistance is 0.25 for all heroes except 0.35 for Meepo and 0.1 for Visage.

Magic resistance items do not stack. Only the most powerful magic resistance effect in a Hero's inventory will provide a bonus. Stacking magic resistance of different types (natural, from item, from ability) occurs multiplicatively. For example, an Anti-Mage with Spell Shield, and Hood of Defiance will have 73.75% magic resistance (in other words will only receive 26.25% of any magical damage).

[edit] Magic resistance on Units

Unit No items or abilities With Cloak With Hood or Pipe With ability
(at max)
With ability and Cloak With ability and Hood or Pipe
Standard Hero 25% 36.25% 47.5%
Meepo 35% 44.75% 54.5%
Visage 10% 23.5% 37% 67.6% 72.46% 77.32%
Anti-Mage 25% 36.25% 47.5% 62.5% 68.15% 73.75%
Viper 25% 36.25% 47.5% 43.75% 52.19% 60.63%
Phantom Lancer 25% 36.25% 47.5% 40% 49% 58%
Rubick 25% 36.25% 47.5% 40% 49% 58%
Pudge 25% 36.25% 47.5% 34% 43.9% 53.8%
Eidolons 50% - - - - -
Lycan Wolf 80% - - - - -
Familiars 100% - - - - -
Necronomicon units 40% - - - - -

[edit] Sources of Magic Resistance

Anti-Mage - Spell Shield
Spell Shield icon.png
Resistance: 26%/34%/42%/50%
Cloak
Cost 550
Cloak icon.png
Resistance: 15%
Does not stack with other magic resistance items.
Hood of Defiance
Cost 2125
Hood of Defiance icon.png
Resistance: 30%
Does not stack with other magic resistance items.
Huskar - Berserker's Blood
Berserker's Blood icon.png
Resistance: 4%/5%/6%/7% per stack
One stack is gained for each 7% of maximum HP that Huskar is missing.
Medusa - Stone Gaze
Stone Gaze icon.png
Resistance: 100%
Duration: 3
Affects enemies only.
Oracle - Fate's Edict
Fate's Edict icon.png
Resistance: 100%
Duration: 3/4/5/6
Can be cast on allies or enemies.
Phantom Lancer - Phantom Edge
Phantom Edge icon.png
Resistance: 10%/15%/20%
Pipe of Insight
Cost 3625
Pipe of Insight icon.png
Resistance: 30%
Does not stack with other magic resistance items.
Pudge - Flesh Heap
Flesh Heap icon.png
Resistance: 6%/8%/10%/12%
Rubick - Null Field
Null Field icon.png
Resistance: 5%/10%/15%/20%
Aura radius: 900
Viper - Corrosive Skin
Corrosive Skin icon.png
Resistance: 10%/15%/20%/25%
Visage - Gravekeeper's Cloak
Gravekeeper's Cloak icon.png
Resistance: 3%/6%/12%/16% per layer
Layers: 4

[edit] Magic Resistance Reduction

Magical damage can also be amplified through reduced magic resistance, it also stacks multiplicatively. For example, if a target is both Decrepified and under the effect of a Veil of Discord, the total damage the inflicted hero(with normal base magic resistance of 25%) will take is 140.625% (0.75*1.5*1.25). The only exception is Ghost scepter/Ethereal blade with Decrepify. Under the effect of both Ghost scepter/Ethereal blade and Decrepify, only the amplification with higher value counts. (Effect of Ghost scepter and Ethereal blade is consider alike because they are in the same item-tree)

[edit] Sources of Magic Amplification

Ancient Apparition - Ice Vortex
Ice Vortex icon.png
Amplification: 15%/20%/25%/30%
Radius: 275
Duration: 12
Elder Titan - Natural Order
Natural Order icon.png
Amplification: 8%/16%/25%/33%
Radius: 275
Ethereal Blade - Ether Blast
Cost 4900
Ethereal Blade icon.png
Amplification: 40%
Duration: 3 (Enemies) 4(Allies/Self)
Affects both caster and target.
Ghost Scepter - Ghost Form
Cost 1600
Ghost Scepter icon.png
Amplification: 40%
Duration: 4
Affects caster only.
Pugna - Decrepify
Decrepify icon.png
Amplification: 50% (Enemy) 25% (Allies/Self)
Duration: 2/2.5/3/3.5
Skywrath Mage - Ancient Seal
Ancient Seal icon.png
Amplification: 18%/24%/30%/36%
Duration: 3/4/5/6
Veil of Discord - Magic Weakness
Cost 2670
Veil of Discord icon.png
Amplification: 25%
Duration: 25

[edit] Anti-magic Shell

Unlike passive magic resistance, Anti-magic Shell effects absorb a set amount of magical damage and then expires. While the Shell is active, affected units will not take any magical or universal damage, though they can still be affected by a spell's secondary effects such as a stun or slow. Other damage types will bypass the Shell and will reduce its remaining health.

The amount of damage the Shell takes is calculated before magic resistance. Instances of damage exceeding the Shell's remaining health will be reduced by that amount and the remainder will deal damage to the target unit. For example, if a Level 4 Dagon is cast on a unit with a 400 HP Anti-magic Shell, the unit will take 300 magic damage, since it delivers 700 magic damage. Only that 300 damage is further reduced by Magic Resistance, to 225 damage factoring base resistance.

[edit] Sources of Anti-magic Shell

Ember Spirit - Flame Guard
Flame Guard icon.png
Shell Health: 50/200/350/500
Duration: 8/12/16/20
Pipe of Insight - Barrier
Cost 3625
Pipe of Insight icon.png
Shell Health: 400
Duration: 10

[edit] See Also

[edit] References

  1. PlayDotA Mechanics: Damage and Armor - DotA Mechanics
  2. Steam 6.78 Patch Notes: Dota 2 Update - June 4th, 2013
  3. Steam 6.79 Patch Notes: Dota 2 Update - October 21st, 2013