### Do %pen items amplify -reduction percentages?

Eberzelius

Recruiter

The max reduction, with fiddle+abyssal is 36, and everybody get more than that by the start. The only reason I can see, is that Riot will probably implement a way to negate the enemy's MR.

Drake Tseng

Senior Member

Quote:
Originally Posted by Fbsunny
No, but you are also doing your maths wrong. Neither flat penetration nor %pen can make an enemies MR go negative, nor will they decrease the MR of an enemy who is already negative.

Abyssal Scepter reduces MR by 20. Sorc shoes and guise each penetrate 20. Meaning if you have all 3 of these items.
An enemy with <20 MR will go negative
An enemy with 20<x<60 will go to 0
An enemy with >60 will have their MR-60

The %pen from void staff is applied after the -MR of abyssal, and before the flat penetration of Guise/sorc shoes. With all 4 of these items the following would happen
An enemy with <20 MR will go negative
An enemy with 20<x<87 will go to 0
An enemy with >87 will have their (MR-20)*.6-40 which will be >0

And for further clarity on this subject, %pens are additive not multiplicative, so with archaic knowledge it would be 55% penetration and the table would look like this.
An enemy with <20 MR will go negative
An enemy with 20<x<109 will go to 0
An enemy with >109 will have their (MR-20)*.45-40 which will be >0

In general you only want the abyssal scepter if you or a teamate has other -MR skills (Fiddle, Amumu, Ryze and probably some I am forgetting), otherwise flat penetration or % penetration is cheaper/more effective.

Poruku

Senior Member

Fbsunny has is explained. If you didn't quite get it, I have smore explanation in my guide, just skip the fiddle stuff.
http://leaguecraft.com/strategies/gu...er+Go+Negative!
If you skip to the magic penetration and reduction section, it explains everything there, rather clearly.

Avloren

Senior Member

Quote:
Originally Posted by Drake Tseng