Question about Last Whisper

[quote=centurion911]It says that it increases Armor Penetration by 40%. Now, does that mean that their Armor amount is reduced by 40% i.e. 200 armor now mitigates as if it were 120 armor when you attack them. Or is it a flat 40% Armor Penetration? i.e. Their armor decreases AD by 50% and it now decreases your AD by 10%. Also, does its effects stack? As in this plus another one plus another one gives me 100% Armor Penetration. I am not trying to build 3 Last Whispers. I would just like to understand its mechanics a bit more.[/quote]

[quote=RaNuD]The wording says "Unique passive: 40% armor pend" which means you can only use this effect once. The "Unique passive" clause is a frequent and IMPORTANT part of items wording :) Your first example is right, it means it'll affect ALL your physical attacks (including physical abilities) so that 200 armor would only mitigate as if there was 120 armor.[/quote]

[quote=Lugignaf]Going off that, if you get the 10% armor pen mastery, it'll only give you 46% armor pen instead of the expected 50% because of how it stacks.[/quote]

[quote=Infectious Lepar]I was under the impression that all stats are compiled before they are applied so basically... 200/(.4 + .1) = 100armor That is how cool-down's are applied so I would assume that armor pen works the same way.[/quote]

[quote=IceCreamy]200/(.4 + .1) = 400 mate. But no, say the enemy has 200 Armor, and you autoattack him holding a Last Whisper. You will attack him as if he has 120 Armor since 40 % of his Armor is negated. Also the 40 % from Last Whisper and the [[Weapon Expertise]] do NOT add up, together they give 46 % I believe.[/quote]

[quote=Infectious Lepar]lol at my math[/quote]

[quote=samgoeslol][quote=Infectious Lepar] I was under the impression that all stats are compiled before they are applied so basically... 200/(.4 + .1) = 100armor That is how cool-down's are applied so I would assume that armor pen works the same way. [/quote] tbh 200/(0.5)=200/(1/2)=200*2=400 its actually armor*(1-armorpen) aka 200*(1-0.4)(1-0.1)=200*0.54=200*(1-.46)=108 armor with effective 46% armor pen interesting thing is: reduction before penetration flat pen before % pen and cooldowns are calculated additively while penetrations are calculated multiplicatively leading to diminishing returns greez sam[/quote]

[quote=Majamorra]---------[b]READ THIS FIRST[/b]: The Next paragraph was taken from the [url=http://www.mobafire.com/league-of-legends/build/pwndo-with-some-new-infos-and-new-build-1-113745]Fuggernought's Dr. Mundo Guide[/url] I send Thanks to thim for make this section. -------- Let's talk about [[Last Whisper]]: When you are farmed or fed you think "Man.. 40% Armor Pen. is ALOT".. let me sat something WRONG!! I'll compare [[Last Whisper]]with [[The black cleaver]]: - [[The Black cleaver]] Shreds up to 45 armor. Lategame, a glasscannon [[Graves]] as 72,6 Armor flat + 30 from max stacks of his passive = 102,6 Armor. [[The black Cleaver]] reduces it to 57,6 Armor. Pretty Decent Reduction. - [[Last Whisper]] grants 40% Armor pen. Taking [[Graves]] 102.6 Armor - 40% of it = 61,56 Armor. "WUTT?" You may ask. "Cleaver shreds more?" Yes it does. So, when you have to chose between buying [[The Black Cleaver]] and [[Last Whisper]], you first need to know the "Sweet Spot" of [[Last Whisper]], when it will penetrate more than Cleaver can shred. 45 Armor Shred of Black Cleaver / 40% Armor Pen of Last whisper = 112,5 Armor The "Sweet Spot", the exact number of Armor the target must have in order for [[Last Whisper]] to be more effective than [[The Black Cleaver]] is 112,5 Armor. When the Target has 112.5 Armor or more, it is more beneficial to buy [[Last Whisper]] in terms of Armor Pen.[/quote]