Magic Armor

Magic Armor reduces the amount of damage you take from Magic Damage. Having a positive amount of Magic Armor will reduce Magic damage by a percentage, while negative Magic Armor amplifies it. Magic Armor is independent from Armor, and does not reduce Physical or True damage.

Formula[ | ]

Damage reduction = ((0.06 * MA) / (1 + 0.06 * MA)) * 100 if Magic Armor ≥ 0

Damage increase = 1 − 0.94^−MA if Magic Armor < 0

Magic Armor is calculated the same way as Armor.

Base Magic Armor[ | ]

All heroes have a base amount of Magic Armor, which does not change with levels.

A majority of heroes have a base Magic Armor of 5.5, a 24.8% reduction. Prior to Version 2.6.24, all heroes had a Magic Armor of 5.5.

Hero	Base Magic Armor	Damage Reduction
Aluna, Andromeda, Artesia, Blacksmith, Blitz, Bombardier, Bubbles, Circe, Defiler, Demented Shaman, Doctor Repulsor, Ellonia, Empath, Engineer, Geomancer, Glacius, Goldenveil, Gravekeeper, Hellbringer, Kinesis, Martyr, Moira, Monarch, Myrmidon, Nymphora, Oogie, Ophelia, Parallax, Parasite, Pearl, Plague Rider, Pollywog Priest, Prophet, Puppet Master, Pyromancer, Revenant, Riftwalker, Rhapsody, Skrap, Slither, Soul Reaper, Succubus, Tempest, The Chipper, Thunderbringer, Torturer, Vindicator, Voodoo Jester, Warchief, Witch Slayer, Wretched Hag	6	26.5%
All Other Heroes	5.5	24.8%
Arachna, Blood Hunter, Bushwack, Calamity, Chronos, Dampeer, Emerald Warden, Fayde, Flint Beastwood, Forsaken Archer, Gemini, Grinex, Gunblade, Klanx, Magebane, Master of Arms, Moon Queen, Monkey King, Night Hound, Nitro, Riptide, Sand Wraith, Scout, Shadowblade, Silhouette, Sir Benzington, Soulstealer, Swiftblade, Tarot, The Dark Lady, The Madman, Tremble, Valkyrie, Wildsoul, Zephyr	5	23.1%
Accursed, Amun-Ra, Apex, Armadon, Balphagore, Behemoth, Berzerker, Bramble, Cthulhuphant, Deadlift, Deadwood, Devourer, Draconis, Drunken Master, Electrician, Flux, Gauntlet, Hammerstorm, Ichor, Jeraziah, Kane, Keeper of the Forest, King Klout, Kraken, Legionnaire, Lodestone, Lord Salforis, Magmus, Maliken, Midas, Moraxus, Nomad, Pandamonium, Pebbles, Pestilence, Pharaoh, Prisoner 945, Rally, Rampage, Ravenor, Salomon, Shellshock, Solstice, Tundra, The Gladiator, War Beast	4	19.4%
Predator	3	15.3%

Sources[ | ]

Magic Armor Modifier[ | ]

Only one of these modifiers will be in effect. The highest Magic Armor modifier will take priority.

Item	Magic Armor given
Barrier Idol	10
Shaman's Headdress	10
Mystic Vestments	5
Nome's Wisdom	3
Jade Spire	3

Abilities[ | ]

Unit/Item	Source	Target	Magic Armor given	Duration	Notes
Arachna	Hardened Carapace	Self	10/20/30/40	5 seconds
Booboo	Frenzy	Passive	3	N/A	Requires Level 4 Summon Booboo; also applies to Wildsoul in Bear Form
Devourer	Cadaver Armor	Passive	0/1/2/3/4	N/A
Jade Spire	Aura	Ally Units	2.5	N/A	Does not stack with Nome's Wisdom
Legionnaire	Terrifying Charge	Self	0/2/4/6	While charging	Buff lingers for 1 second after a successful charge
Magebane	Master of the Mantra	Passive	4/8/12/16	N/A
Maliken	Hellbourne Zeal	Passive	0.1 per charge	N/A	Gain 1 charge per 1% Health missing
Myrmidon	Forced Evolution	Self	3/5/7	20 seconds (Toggle)
Nome's Wisdom	Aura	Ally Units	2	N/A	Does not stack with Jade Spire
Shadowblade	Gargantuan's Blast	Self	1/2/3/4	15 seconds	Applies while in Gargantuan Form
Shellshock	Sanctuary Stone	Ally Units (Aura)	1/2/3/4	N/A
Solstice	Blinding Rush	Self	1/2/3/4	While charging	Buff lingers for 3 second after a successful charge

Magic Armor Reduction[ | ]

Hero/Item	Source	Target	Magic Armor reduced	Duration	Notes
Blacksmith	Flaming Hammer	Enemy Units	1/2/3/4	7.5 seconds	Decays after 2 seconds over remaining duration
Harkon's Blade	Toggle	On Attack	5	3 seconds
Hellbringer	Evil Presence	Enemy Units	1/2/3/4	5 seconds
King Klout	Conscription	Enemy Units	0.4/0.6/0.8/1 per charge	3 seconds	Max 5 charges
Myrmidon	Wave Form	Enemy Units	1/2/3/4	6 seconds
Plague Rider	Earthblight	Enemy Units	1/2/3/4	Up to 4 seconds	Applies while tethered
Revenant	Mortification	Enemy Units	1/2/3/4	6 seconds
Shellshock	Sanctuary Stone	Enemy Units (Aura)	1/2/3/4	N/A
Void Talisman	Activation	Self	5.5	4 seconds

Magic Armor Penetration[ | ]

Magic Armor Penetration causes Magic Damage to ignore a certain amount of Magic Armor. Unlike Magic Armor reduction, Magic Armor Penetration benefits only the user. Magic Armor Penetration will only ignore up to how much Magic Armor the target has, and has no effect if Magic Armor value is negative.

Unit/Item	Source	Target	Magic Armor penetration	Duration	Notes
Lodestone	Shatterstorm	Enemy Units & Self	100%	5 seconds
Rhapsody	Arcane Hymn	Ally Heroes (Aura)	0.5/1/1.5/2	N/A
Sir Benzington	Heart Piercer	Passive	1/2/3/4	N/A	Does not apply to items
Spellshards	Passive	Enemy Units	60%	N/A