I need Lol Math help

BeatzBoyFTW·Oct 16, 2015·2 votes·1,123 views

So let's say I have the following:

Ryze's Q deals 100 AP AP Runes of 50 AP AP Penetration of 30 Enemy's Magic Resist is 50

And Ryze's damage would be about 150 AP right? (Assume ratio is 1.0)

But since the enemy's magic resist is 50, it would block 50 AP damage, therefore total damage dealt is** 100** instead.

And after that, I now input my 30 AP penetration, so now my damage to that same enemy would now be 130.

Is my math here correct? I'm trying to sort out new rune pages.

6 Comments

5000000000000000Oct 16, 20151 votes

That's not how resistances work.

50 MR means that you gain 50% bonus effective health against magic damage. If you have 1000 HP and 50 MR, it takes 1500 magic damage to kill you. If you have 2000 HP and 50 MR, it takes 3000 magic damage to kill you. That means that having 100 MR halves the incoming magic damage.

Magic penetration makes it so that you ignore a portion of MR.

Zair UmbrasOct 16, 20151 votes

That's... That's not how you should look at it. It does 'seem' to work out like that, but that doesn't mean you should do it like that. o.o Just use the normal equation which is (MR Or Armor)/(MR or Armor + 100). It's typically easier to just do that equation to find the actual percentage of reduction rather than factoring in your healthbar.

DarkwindOct 16, 20151 votes

It doesn't "seem" to work out like that, it actually does that.

You're both right in what you're saying, but one isn't more right than the other. The damage multiplier is given by MR/(MR+100), and each point of MR also increases your effective magical health by 1%. So there's no reason that one way would be better than the other, they just give different information.

5000000000000000Oct 16, 20151 votes

The "effective health" helps you calculate if you're tanking and the formula is more helpful if you're a primary damage dealer.

Zair UmbrasOct 16, 20151 votes

Resistances work as Resistance divided by Resistances plus 100. This means if you have 50 Resist, you have 50/150, which is 1/3, about 33.33% reduction. With his 30 Pen, his target has 20 resist, so it's 20/120 instead, which is 1/6, which equates to about 16.67% reduction. IF his Q would do 150 damage, it would instead do 17%ish less, totaling 124 damage.

The more MR and Armor some one has, the less flats work, but the LESS MR and Armor they have, the MORE effective your Flats are and less effective your percents are. Which is why Ghostblade is such a good item for assassins who attack low armor targets.

DrCyanideOct 16, 20151 votes

{quoted}

Ryze's Q deals 100 AP

There's no such thing as dealing 100 AP. You have an AP Scaling and you have a Base Damage, and it deals Magic Damage, Physical Damage, or True Damage.