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Question about Last Whisper

Creator: centurion911 April 13, 2012 4:30am
centurion911
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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.
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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.
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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.
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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.
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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.

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lol at my math
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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.


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

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READ THIS FIRST: The Next paragraph was taken from the Fuggernought's Dr. Mundo Guide 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 Whisperwith 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.

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