Magic resistance

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Magic resistance is an attribute of heroes, extremely similar to armor. Instead of reducing physical damage, it reduces magical damage. All heroes, except Meepo, 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.

[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]. 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.

magical damage × ( 1 + magic amplification ) × ( 1 - 0.25 natural resistance ) × ( 1 − magic resistance of item ) × ( 1 − magic resistance of first ability ) × ( 1 − magic resistance of second ability ) = actual damage

In the formula above, replace the 0.25 natural resistance with 0.35 if targeting Meepo.

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	25%	36.25%	47.5%	73%	77.05%	81.1%
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%	37%	46.45%	55.9%
Eidolons	50%	-	-	-	-	-
Lycan Wolf	50%	-	-	-	-	-
Familiars	96.25%	-	-	-	-	-
Necronomicon units	40%	-	-	-	-	-

[edit] Sources of Magic Resistance

Anti-Mage - Spell Shield

	Resistance: 26/34/42/50%

Cloak 550

	Resistance: 15% Does not stack with other other magic resistance items.

Hood of Defiance 2125

	Resistance: 30% Does not stack with other magic resistance items.

Huskar - Berserker's Blood

	Resistance: 4%/5%/6%/7% per stack One stack is gained for each 7% of maximum HP that Huskar is missing.

Medusa - Stone Gaze

	Resistance: 100% Duration: 3 Affects enemies only.

Oracle - Fate's Edict

	Resistance: 100% Duration: 3/4/5/6 Can be cast on allies or enemies.

Phantom Lancer - Phantom Edge

	Resistance: 10/15/20%

Pipe of Insight 3628

	Resistance: 30% Does not stack with other magic resistance items.

Pudge - Flesh Heap

	Resistance: 4/8/12/16%

Rubick - Null Field

	Resistance: 5/10/15/20% Aura radius: 900

Viper - Corrosive Skin

	Resistance: 10/15/20/25%

Visage - Gravekeeper's Cloak

	Resistance: 3/6/12/16% per layer Layers: 4

[edit] Magic Amplification

Magical damage can also be amplified, it also stacks multiplicatively. For example, if a target is both Ethereal and under the effect of a Veil of Discord, the total amplification will be 75% (1.4*1.25); taking into account 25% magic resistance the damage increase amounts to 31.25% (1.4*1.25*0.75).