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I changed some some small things, but the main phylosophy was the same.
I have worked on this problem with a friend of mine.
With google formula (to plot math curves) we were able to answer the question.
To put it simple:
imagine damage runes on the one hand and armor penetration runes on the other hand as two math curves. Both are falling because of more and more armor is attached.
There is a point each curves are crossing each other. At start the armor penetration runes are better. If u put up more and more armor at some point the ad runes are better. (that is no mistake!)
BUT!! here was my mistake, with an ad carry u will get very fast a high amount of attack damage and the point of crossing is nearly not reachable. That means because of getting more damage and because with an carry u want to kill the other to carries (with armor at 70-100 max) armor pen is much better! (up to 10% with quints too)
HF playing LOL
FlipFlop
Could u please give me an example calculation why armpen marks are better then flat damage marks?
my example:
me: 50 damage; enemy: 30 armor
when I would have a damage output of 50 and 9 flat damage marks -> 50 + (9 x 0.95 = 8.55) = 58.55 damage
9 armpen marks -> 9 x 1.66 = 15 armpen (14.95)
58 damage on 30 armor -> 58 x (100/130) = 44.6 damage
50 damage on 15 armor left -> 50 x (100/115) = 43.5 damage
next step, the enemy got 35 BONUS armor, same damage and armpen
58 damage on 65 armor -> 58 x (100/165) = 35.15 damage
50 damage on 50 armor left -> 50 x (100/150) = 33.33 damage
If u ask me, armpen is ****, with Pantheon even more...
If I have made a mistake please tell me! I want to by some marks xD