Magic-Resistant Heroes

Magic Resistant Heroes by Role:

Pipe Carrier / Offlane:  Centaur?  Elder Titan?  Pudge?

Carry:  Meepo / Ember / Anti-Mage (Lifestealer  - Rage?))

Supports:  Rubick + Visage (Omniknight – Repel?)

Mid:  Huskar / Viper

Other items:  Infused Raindrops

Example:

With Rubick + Pipe Aura…

Formula =

1 - (1 – Base Hero Resistance) × (1 – Ability Added Resistance) × (1- Pipe Aura) x (1- Rubick Bonus) = XX.X resistance

Anti-mage would have (L4 Spell Shield):

1 - (1 - 0.25) × (1 - 0.5) × (1-0.10) x (1-0.22) = 73.7% resistance

Huskar would have (at or below 10% hp, L4 Berserkers Blood):

1 - (1 - 0.25) × (1 – 0.5) × (1-0.10) x (1-0.22) = 73.7% resistance

Viper would have (L4 corrosive skin):

1 - (1 - 0.25) × (1 - 0.25) × (1-0.10) x (1-0.22) = 60.5% resistance

Visage would have (L4 Gravekeeper Cloak, max layers):

1 - (1 - 0.10) × (1 - 0.64) × (1-0.10) x (1-0.22) = 77.3% resistance

Add: Glimmer Cape = 81.8% resistance

Base Formula (http://dota2.gamepedia.com/Magic_resistance )

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

Note:  While magic resistance % increase shows diminishing returns, effective HP vs. magic damage still increases in a linear fashion.