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Damage Reduction Stacking

PatMcGroyn·12/21/2016, 12:50:44 AM·4 votes·1,178 views

I'm wondering how damage reduction stacking works, whether it stacks multiplicative or additive. For example, a build I like to go on Yi is Skirmisher's Bloodrazor, Phantom Dancer, Ninja Tabi, Randuin's, Maw, IE. Lots of damage, but surprisingly tanky.

That's 20% damage reduction from Challenging Smite, 12% damage reduction from Lament, 12% AA damage reduction from Tabi, and 10% crit damage reduction from Omen. Let's say I'm getting auto attacked by a 100% crit ADC; does that mean that I have 54% damage reduction against those auto attacks (disregarding armor & arm pen)?

These game mechanics should be so much easier to figure out, but Riot has always been pretty shitty about making them readily available and understandable.

9 Comments

500000000000000012/21/2016, 1:26:06 AM2 votes

It's multiplicative. so (1-0.2)x(1-0.12)x(1-0.12)x(1-0.1)=0.8x0.88x0.88x0.9=0.557568 Which is about 44% damage reduction total.

But I definitely agree, it should be easier to figure out.

Bhagswag12/21/2016, 2:15:51 AM2 votes

Nope.

If an auto does 100 damage, the challenging smite will take off 20% from it.

So now you have 80 damage left. THEN lament takes 12% of 80 (not 100), so you have 70.4 damage left.

Then Tabi takes 12% off that, and you have 62 damage left. Then Omen takes 10% from 62, and you have 55 damage left.

All that stuff took away 45 out of 100 damage, so about 45% damage reduction.

PatMcGroyn12/21/2016, 1:22:42 AM1 votes

Anybody? Mods?