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Penetration: A Great Investment

K54·8/25/2015, 2:36:18 PM·2 votes·896 views

My mage rune page consist of +20 magic penetration with +27 armor at level 18. The fact that item 3020 item 3135 item 3151 are in all my builds, I end up with 50 magic penetration after ignoring 41% (including the 6% from masteries).

The most magic resist in a tank is item 3111 item 3065item 3026. With that said, at level 18, tank has 210.4 magic resist with +27 mr from glyphs.

You're ignoring 41% of that mr then penetrating 50, that leaves the tank with 74.136, if you're using a melee APC Fizz Akali Ekko Diana etc, you can add a item 3001 to the mix bringing mr to 54.136

Against any opponent that doesn't have magic resist (base is either going to be 53.4 or 30 at level 18 depending on the champ), their mr will be negative, which multiplies magic damage against them from x1.5 to x2 which is equivalent to an AD champ with 100% critical strikes.

When using Darius MonkeyKing Renekton Vi XinZhao Trundle JarvanIV I go item 3035 item 3071 then full tank for 86% to 100% armor penetration, add in the +20 armor pen runes and every champ (even if their build is item 3047 item 3075 item 3110item 3742 item 3143 item 3026 ) will have a negative armor value which amplifies damage. Who needs critical strikes?

14 Comments

IllllllIIIIlllll8/25/2015, 2:46:39 PM2 votes

magic resist can't go negative. but I agree, magic penetration is a heavily underestimated stat. I get sorc shoes second item and almost always opt for void staff instead of rabadons (did the math here, on most champs you would need 300 ap before rabadon for it be better against someone who doesn't build mr).

kynan1238/25/2015, 10:07:04 PM2 votes

( ͡° ͜ʖ ͡°) P E N E T R A T I O N ( ͡° ͜ʖ ͡°)

Ionian8/25/2015, 2:49:02 PM1 votes

Penetration cannot reduce armor/mr to a negative value. Min is 0. Also the viability of item 3001 item 3151 depends on the champion's kit. Wouldn't really build liandry on a burst mage like Ahri.

Ipols8/25/2015, 4:01:42 PM1 votes

the MR reduction from item 3001 is applied BEFORE the penetrations, as others say, you can't amp. the magic dmg you do by making a resistence negative

FatalHalo8/25/2015, 8:53:05 PM1 votes

% Penetration becomes less effective with Flat Penetration because it applies after Flat Penetration. 200 Armor - 20 Penetration = 180 - 63 = 117 (Flat Penetration With Last Whisper) 200 Armor - 70 = 130 (With Last Whisper) The difference is 13 Armor.

TurquoiseYoshi8/26/2015, 2:28:14 AM1 votes

I always invest in penetration ( ͡° ͜ʖ ͡°)