Talk:Kayle/@comment-4881935-20130118012005/@comment-2124153-20130118175559

''Interceptor, ur flawed with ur logic. Armor = effective health. Armor does not grant a linear slope with damage reduction.''

Do the math. Or just look at my post where I did it for you. You get a greater increase in damage dealt via reduction/penetration per point the lower that the base value is to begin with. This is the value of stacking penetration or reduction.

We only care about Armor/MR to the extent that it reduces our damage. If diminishing returns on %reduction doesn't result in diminished damage increases, it is non-synergistic?

In this extreme situation, which champion would get more effectiveness from grabbing this item and why?

This is an irrelevant question. The issue is synergy. Synergy is defined as the whole being greater than the sum of its parts. %Penetration and %Reduction have synergy against high values of Armor and MR in the example that I gave, because the combination of the two is better that the fake scenario where we could just add the two gains together independently (such as with %reudction and flat reduction).

Again: do the math.

But to your extreme situation, I give you another: both champions fight something with 100 billion Armor. Now they get about the same effectiveness from the item.