Magic Penetration Question

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Uhmm

Senior Member

06-11-2010

How exactly does magic penetration work? Which is to say, in what order are % and flat reduction applied?

For example:

enemy has 100 magic resist, i have 20 magic pen and 15% MR reduction. how much resist does the enemy effectively have?


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selenvar

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Senior Member

06-11-2010

65 mpen.


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Uhmm

Senior Member

06-11-2010

uhh...how does that work?


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Larias

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Adjudicator

06-11-2010

Quote:
Originally Posted by Uhmm View Post
How exactly does magic penetration work? Which is to say, in what order are % and flat reduction applied?

For example:

enemy has 100 magic resist, i have 20 magic pen and 15% MR reduction. how much resist does the enemy effectively have?
100 - 20 = 80

80 * .85 = 68

68/168 = 40.47% magic resist


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Orange Extract

Senior Member

06-11-2010

A recent patch made the percent apply after the flat. Before that it was percent first.

Old way
100 MR * .85 - 20 = 65 MR
New way
(100 MR - 20)* .85 = 68 MR

% reduction goes from
100/(100+100) = 50%
to
68/(100+68) = 40%

A 20% increase in damage.


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Larias

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Adjudicator

06-11-2010

Quote:
Originally Posted by Uhmm View Post
uhh...how does that work?
Order goes:

Reduction (abyssal scepter, Amumu's passive etc.)
Flat reduction (Any item that gives a flat +penetration number such as Haunting guise)
% reduction (Masteries/Void staff)

To tell if something is a "reduction" all you have to know is that all reduction effects actually change the visible stat on screen.


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0rangeSoda

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Recruiter

06-11-2010

Magic Pen allows for you to ignore a certain amount of Magic resist
while reducing magic resist does almost the same thing
Magic Pen and Magic Resist Reduction are 2 different things


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Uhmm

Senior Member

06-11-2010

thank you Larias very informative.

and thanks to you other folks as well


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Larias

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Adjudicator

06-11-2010

Quote:
Originally Posted by Uhmm View Post
thank you Larias very informative.

and thanks to you other folks as well
Np.

If you have any more questions, I suggest the New Player Forum. The people there are so much more awesome than me.