User blog comment:ClariS/AD has Diminishing Returns!!/@comment-4929329-20120828162332/@comment-80.15.143.26-20120828230534

....

really?

armor has diminishing return clearly

for armor damage reduction it's 100 / (100 + armor)

you clearly see that the more armor you get the less the bonus reduction is, also last whisper and the offensive tree make stacking shitloads of armor even less effective

look:

you have 50 base armor : add 50 you have 100

at 50 you ignore 34 % roughly

at 100 you ignore 50% so a 16% increase

at 150 you ignore 60% a 10% increase

at 200 you ignore 67 % ( i'm rounding)  a bit less then 7% increase.

so a rammus with his base armor boost will be much harder to kill by an AD champ with a sunfire cape then a frozen heart because once your reach 250+ armor the increase is barely noticeable.

because it's calculated by a division and NOT by substracting damage.

everything get lower results once you stack it too much

i believe there is one thing though  that has 0 diminishing return : CDR since casting 40% fast WILL make your  DPS 40% higher on  casters on the long run.

(although i'm not a maths teacher or anything )