General

Is the extra PDR from purge area applied differently? If so I may change my hypers..

@Rianael: I think they do, but I'm not sure. Purge Area definitely stacks with Threaten from what I've seen, so Demon Cry should also work even though it's an attack.

@TripleBladez: Oh thanks! Never knew, glad I found out though. Can you confirm that Demon Cry and Threaten stack?

@Rianael: Threaten - Enhance doesn't stack additively for a "50%". Threaten (30%) and Threaten - Enhance (20%) are treated as two separate sources.

@fearofoneman: Theoretically, you'd cap at 99%, not 90%. This is without having a skill that ignores all PDR (e.g. Asura, Typhoon Crush, etc).

[quote=kvopka]since most people dont know how PDR works, I'll try to explain it.
1) The PDR% displayed in your stat window means nothing. Ignore that completely. That just sums up all of your PDR but doesn't determine how much %def you ignore.
2)Try to think of boss defense as a number, rather than a %
3) remember big lines (40%/30% >>>> 15%/10% given the same cumulative total PDR%)
4) For any boss with defence of 50 or more, PDR%>Boss% (I don't understand why PDR nebs are less than boss nebs)

Ok. Imagine you're fighting chaos vellum which has 300 defence. You have a bagde with 2 lines, 40% ignore def and 30% ignore def. The total for this is 70% right meaning you vellum only has 0.3 x 300 = 90 defence against you right? WRONG. PDR works like this. The badge with the 2 lines of 40% and 30% means that for the 40% line, you will in fact ignore 40% of the 300 defence -> you are left with 60%. So 0.6 x 300 = 180 defence. Then the 30% line calculation is done using the 180 def left over after the 40% line. So you will ignore 30% of 180 def, meaning 70% of 180 is left ---> 180 x 0.7 = 126 def. This calculation assumes only 2 lines and one source of PDR. So vellum's final def against you will be 126, or if you want to work out a percentage, it will be 126/300 x 100 = 46%Def which remains ---> hence you ignore 54% of ANY BOSS' DEF, and NOT 70% which will be displayed in your stat window.

Now imagine your stat window displays 70% PDR but you have several sources of PDR, all of which are individual 10%'s. Assuming chaos vellum's defence of 300 again, you have 7 x 10% lines. So to calculate your true PDR you have to understand that 10% PDR means that 90% def remains after each line. So 300 x 0.9 x 0.9 x 0.9 x 0.9 x 0.9 x 0.9 x 0.9 = 143 Def remains. Hence to find out what % of vellums def remains, you will do 143/300 x 100 = 48% ----> you ignore 52% of ANY BOSS' def and NOT 70%.

So as you can see, you can never reach true 100% PDR and you keep multiplying existing def by a number >1>0.
Furthermore, I hope I showed that big lines are more important than small ones as 70% PDR from 40% + 30% = 54% true PDR, whilst 70% PDR from 7 x 10% lines = 52% true PDR.

The only possible way to achieve 100% true PDR would be if you have a single line which was 100% PDR.[/quote]

Guy knows what he's talking about

@yoshidude90: If you're talking about the value in the stats window it's incorrect and has been since the Unleashed Patch.

[quote=aeswag]I don't know anything about warrior classes but I can tell you that 100% PDR and over is impossible now. Nexon switched to a multiplicative formula so I'd say if you already have a bunch it wouldn't be worth it unless you got it cheap and would be fine defusing it for a boss neb.[/quote]

It is not impossible i have 116% PDR as we speak

My bam has 108% PDR when my zero up to 180, and my guildies said some bosses have more than 100%.
P/s : chaos vellum 300% PDR, i saw some bucc and mer clips that damage went from 8m to 50m with 40% chance to ignored all def (?)
(My English is bad F3)

[quote=Chuta]I believe you add if it's from the same source ie. same weapon[/quote]

Yes you are correct, however your definition of "source" is mistaken. Each equipment/weapon may have up to 4 sources:

1) Located directly on the weapon
2) Regular Potential
3) Bonus Potential
4) Nebulite

Each of these sources are also combined multiplicatively with secondary weapons, skills, set effects, etc.

As a side note, you also cap at a 90% PDR rate multiplicatively.

@Chuta:

"Can someone explain to me how PDR is going to stack in the future? IIRC, PDR stacks additively, so if I have, lets say, a 15%PDR weapon and a 15%PDR skill, I would have 30%PDR, correct?

More accurately, currently you ignore 30% PDR. So on a 50% PDR boss, you ignore 30% = -15% = 35% PDR left.
After Unlimited, the same boss will have (50%) * (1-.15) * (1-.15) PDR left, or 36.125% PDR left.
It's not a huge shift unless you ignore 100% now, because you'll never be able to ignore all PDR with Unlimited's formula.
I think a typical person would have around 20% PDR left on say Empress post-Unlimited, when they ignore 100% of her PDR now.
This figure only increases on the bosses with even higher PDR% (Chaos PB, 180%, Chaos RA, 300%, etc)."

(http://www.basilmarket.com/forum/2623376/0/New_multiplicative_Pdr_stacking.html)

@Chuta: You're adding. Not multiplying. The new system is multiplicative not additive like is used to be.

I don't know anything about warrior classes but I can tell you that 100% PDR and over is impossible now. Nexon switched to a multiplicative formula so I'd say if you already have a bunch it wouldn't be worth it unless you got it cheap and would be fine defusing it for a boss neb.

I heard there's a threaten stacking glitch right now, too. I had 100% pdr, but when I jumped to 160%, it helped in every way

[quote=abi232]Don't paladins ignore boss defence, making pdr useless?[/quote]

Elemental* but they do technically ignore a lot of PDR anyway with 50% "pdr" decrease from Threaten hyper. I wouldn't go with another PDR neb, important skills like Blast ignore a heck ton of PDR.

Don't paladins ignore boss defence, making pdr useless?