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Percentual damage reduction?

Creator: caspercom June 16, 2011 2:40pm
caspercom
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Ok, so we have all kinds of abilities/items/masteries etcetera that reduce incoming damage by a set percentage. My question is: how do these stack?

Example:
    I'm playing Galio and I use my ult, reducing incoming damage by 30%.
    My defensive mastery tree is built up to the highest rank, giving me 4% reduced damage.
    Because my killstealing skills are awesome, my leviathan has 20 stacks, reducing damage by 15%.
    Our ever friendly allied Maokai uses his ult around me, adding 20% damage reduction.

Does this mean I have 69% damage reduction or do they stack differently? And if they do, in what order?

Lugignaf
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I think they stack multiplicatively.
So you would get about 57% reduction if my math is right and they do indeed stack how I think they do.
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Nighthawk
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Nah. As far as I know they stack additively.

Essentially if you have 100% reduction, you take no damage. However it could be that i'm thinking of percent armor reduction or something...


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They stack multiplicatively.
54.3%reduction.
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It's .7 (100%-30%), .96 (100%-4%), .85 (100%-15%), .8 (100%-20%)

So, .7*.96*.85*.8 = .45696

So you would have 54.304% damage reduction.

Basically, this would apply after armor/MR.

With your base of 85 Armor, you would have 79% Damage reduction against physical attacks.
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