What's the difference between lowering magic resistance and magic penetration?

#1DustStarPosted 1/20/2010 8:11:09 AM
Like this item Abyssal Scepter says that it lowers enemy magic resistance by 30... what exactly does that do in comparison to having 30 magic penetration?
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#2mafiafunPosted 1/20/2010 9:06:55 AM
That aura actually has to reach them to lower their resistance, while if you have 30 magic penetration, you can be further away and still do full dmg.
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#3DustStar(Topic Creator)Posted 1/20/2010 9:17:03 AM
So is it basically the same increase in magic damage?
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#4CalmOfEmptinessPosted 1/20/2010 10:16:24 AM
That aura actually has to reach them to lower their resistance, while if you have 30 magic penetration, you can be further away and still do full dmg.

That didn't really answer his question.

Anyway, TC, I have no idea. I'll try to find an answer for you.
#5mafiafunPosted 1/20/2010 10:20:34 AM
It's the same thing I believe.
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"If freedom is short of weapons, we must compensate with willpower." - Adolf Hitler
#6CalmOfEmptinessPosted 1/20/2010 10:27:33 AM
Yeah, it's the same thing, but Magic Penetration can't lower the stat below 0.

They're calculated at different times, so basically let's say you have Kayle with 30 Magic Resist.

The Magic Penetration from Sorceror's Boots or Haunting Guise is calculated first, so she has 10 MR. Then Abyssal's reduction is calculated, so then she has -20 MR.

If you have both Haunting Guise and Sorceror's Boots, then you are lowering it to 0, and then Abyssal is calculated to be -30. So, you are losing a bit of efficiency from your Magic Penetration items.
#7DustStar(Topic Creator)Posted 1/20/2010 10:46:14 AM
SPIFFY... ok thanks
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#8Frost_bornePosted 1/20/2010 12:28:32 PM
Magic penetration can pierce resistance that the target already has built up via gear or runes. Reduced resistance can bring resistance all the way down to 0, and past it if enough is stacked (or the target has crappy resistance anyway). As stated above, the reduced resistance auras actually have to touch the target to affect them. Say you use Karthus's ultimate, Requiem (blasts every champion on the field with moderate magical damage). Magical penetration would apply to that because it's actually "built in" to a champion's stats once they aquire gear or runes with it (though it doesn't show up on your characters base stats). But not reduced resistance.
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#9Twinrova225Posted 1/20/2010 4:50:39 PM
The Magic Penetration from Sorceror's Boots or Haunting Guise is calculated first, so she has 10 MR. Then Abyssal's reduction is calculated, so then she has -20 MR.

If you have both Haunting Guise and Sorceror's Boots, then you are lowering it to 0, and then Abyssal is calculated to be -30. So, you are losing a bit of efficiency from your Magic Penetration items.


Unless it was changed in a recent patch, I believe that's incorrect. The order is:

Reduction (Abyssal Scepter, Fiddlesticks passive)
Percentage penetration (Void Staff, Offensive Mastery)
Direct Penetration (Sorcerers Boots, Haunting Guise)

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#10thepotatomanPosted 1/20/2010 5:29:27 PM
But if you use reduction then any team mate can also capitalize while penetration will only work for your attacks, right?