The sad thing about this combo is that RO’s active only lasts like 2 seconds, so if you use it as you ult as Malphite it will wear off before the stun does. :(

Here is an example of additive multiplication on a stat:

Attack Speed also has some wacky math involved.

And Armor Pen has several different categories of reduction, like for example, Armor Pen itself cannot reduce armor below zero, but Armor Reduction can, and in fact, having negative armor grants bonus damage.

http://leagueoflegends.wikia.com/wiki/Item has links to all the basic effects and the math on them.

I believe armor penetration and reduction is calculated before %.

the wiki one is wrong.

there is a sticky for this on the official forum

http://www.leagueoflegends.com/board/showthread.php?t=3287

Q: What order is armor penetration/MR penetration applied in?

A: From top to bottom

Armor/MR Reduction
Flat/Linear Armor/MR Penetration
% Based Armor/MR Penetration

The Wiki isn’t wrong, the order as stated in the Wiki is:

  1. Percentage Magic Resistance Reduction
  2. Flat Magic Resistance Reduction
  3. Flat Magic Penetration
  4. Percentage Magic Penetration

Percentage MR Reduction is still MR Reduction, not Penetration. And the Wiki lists Nidalee’s Bushwack as the only spell that actually does this for MR, though several %Armor Reduction abilities exist including Jarvan and Urgot.

So those spells effectively cut through a percent of the opponent’s armor before penetration and other reduction effects (usually items like Black Cleaver) are factored in.

I said armor, because the armor penetration wiki use an example…

Examples

You have 30% armor reduction, 20 flat armor reduction, 10 flat armor penetration, and 40% armor penetration.

* Target A has 80 armor.
      o The 80 is reduced to 56 by your 30% armor reduction. 
      o The 56 is reduced to 36 by your 20 armor reduction.
      o The 36 is reduced to 26 by your 10 armor penetration.
      o The 26 is reduced to 15.6 by your 40% armor penetration.
            + 26 - (26 * 0.40) == 26 - 10.4 == 15.6 
      o Target A takes damage as if it has 15.6 armor
* Target B has 18 armor.
      o The 18 is reducted to 12.6 by your 30% armor reduction.
      o The 12.6 is reduced to -7.4 by your 20 armor reduction.
      o The -7.4 is not reduced by your 10 armor penetration (cannot penetrate below 0).
      o The -7.4 is not reduced by your 40% armor penetration (cannot penetration below 0).
      o Target B takes damage as if it has -7.4 armor. 

correct way would be.

example 1 : ((80 - 20) - 10)) * 0.4 = 20.

example 2 : 18 - 20 = -2

so is it:

% armor reduction, followed by flat armor reduction, flat armor pen, % armor pen

OR

flat reduction, % reduction, flat pen, % pen?

Idrisz, you… completely forgot about the 30% armor reduction? The Wiki isn’t wrong, that example is following the dev post.

I mean, you can see the target’s armor after using Urgot’s E or Jarvan’s Q, they will have a debuff and their armor will drop by that percentage. That is the armor that you are now attacking against and which all further calculations from your champ will apply. AFAIK there is no item that does % armor reduction, only abilities that debuff the enemy.

oh yeah, I think I did forget it, hmm there are % armor reduction item/skills?

that sounds OP!

Play someone other than Malzahar some time and you may be surprised at the abilities other champions have, particularly abilities that help other people do damage!

But that would make it harder to kill steal.

Nidalee, Trundle, Urgot and Renekton are the only ones i think.

how can I carry if I don’t play a carry…

just so you know teemo is the Kill stealer one, Malzahar is the “late game omg we lost all lane, let’s team fight” champion.

Every champion in this game can carry.

Oh god, I’m in a ranked game where first thing a guy says “I’m warwick mid.” I say, “that’s a joke, right?” He says nothing the whole time and then with 4th pick takes warwick and says he’s going mid, despite everyone telling him how bad of an idea that is and us having no jungler. This game is going to go well…

Edit: Okay, their Morde never showed up and even if they did I think we would have won easily anyway since we went 21-4. Always an adventure in low Elo.

Did he say this before or after bans? If I had first pick I would’ve banned WW just to spite him.

Before. I should have suggested that.

On a good run of ranked games, 4 in a row. On the 5th TWO people AFK at champ select. Wish me luck folks!

Can’t you queuedodge at that point still for only a 5min penalty?

3 games in a row where someone on the opposing team queue dodged, and then the matchmaker set me up onto that team, and it was fucking obvious why someone queue dodged but I decided to play anyways. Big mistake.

I fucking love Nasus. I get to explode their carries while being completely ignored. So. Much. Fun.

Well, maybe not completely. After the fourth or so teamfight they wised up and the carries focused me down while Malphite and Morde kept my team (feedwick!) busy.