Spell Resistance Stats from highest to lowest
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Heroes without spell resistance skills:
No Items: 25%
Cloak only: 36.25%
Hood only: 47.5%
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Anti-Mage:
Spell Shield level 4 gives 40% more spell resistance
No Items and skills: 25%
Cloak only: 36.25%
Hood only: 47.5%
Spell Shield only: 55%
Cloak and Spell Shield stacked: 61.75%
Hood and Spell Shield stacked: 68.5%
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Netherdrake:
Corrosive Skin level 4 gives 20% more spell resistance
No Items and skills: 25%
Cloak only: 36.25%
Corrosive Skin only: 40%
Hood only: 47.5%
Cloak and Corrosive Skin stacked: 49%
Hood and Corrosive Skin stacked: 58%
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Pudge:
Flesh Heap level 4 gives 16% more spell resistance
No Items and skills: 25%
Cloak only: 36.25%
Flesh Heap only: 37%
Cloak and Flesh Heap stacked: 46.45%
Hood only: 47.5%
Hood and Flesh Heap stacked: 55.9%
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Appendix A: Formula
How to calculate for the spell resistances:
A.) 2 Sources
This is for heroes without resistance skills or the 3 that do have it but do not choose to stack
Spell Resistance = (1 - (1 - S1) * (1 - S2)) * 100
The first source (S1) will always be your natural resistance of 0.25. The second source (S2) will be 0.15 for Cloak, 0.30 for Hood, 0.4 for Spell Shield, 0.2 for Netherdrake and 0.16 for Flesh Heap.
Example: Any hero with Hood
S1 = 0.25
S2 = 0.30
Spell Resistance = (1 - (1 - 0.25) * (1 - 0.30)) * 100
Spell Resistance = (1 - (0.75) * (0.70)) * 100
Spell Resistance = (1 - 0.525) * 100
Spell Resistance = 0.475 * 100
Spell Resistance = 47.5%
B.) 3 Sources
This is for Magina, Netherdrake and Pudge if they choose to stack an item with their resistance skill.
Spell Resistance = (1 - (1 - S1) * (1 - S2) * (1 - S3)) * 100
The first source (S1) will always be your natural resistance of 0.25. The second source (S2) will be 0.15 for Cloak or 0.30 for Hood. The third source (S3) will be 0.40 for Spell Shield, 0.20 for Corrosive Skin and 0.16 for Flesh Heap.
Example: Netherdrake with Cloak and Corrosive Skin
S1 = 0.25
S2 = 0.15
S3 = 0.20
Spell Resistance = (1 - (1 - 0.25) * (1 - 0.15) * (1 - 0.20)) * 100
Spell Resistance = (1 - (0.75) * (0.85) * (0.80)) * 100
Spell Resistance = (1 - (0.6375) * (0.80)) * 100
Spell Resistance = (1 - 0.51) * 100
Spell Resistance = 0.49 * 100
Spell Resistance = 49%
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