[Rugar]

Started tanking a bit on my paladin lately and was wondering how the damage reduction from my talents, glyphs and armor were calculated.
I have a 6% damage reduction from Imp. Righteous Fury, 3% from Sanctuary, 3% from Shield of the Templar and 3% from Glyph of Divine Plea. Does all these stack and give a total of 15% damage reduction or are they added one by one for a total ~14,2% damage reduction?
And how does the damage reduction from armor figure into this?

Thanks for any help

[jere]

damage = damage_unmitigated*(1-DR_armor)*(1-DR_RF)*(1-DR_BoSanc)*(1-DR_SotT)*(1-DR_DP)

OR

damage = damage_unmitigated*(1-DR_armor)*(1-0.142)

It is essentially your latter explanation (adding one at a time), though in reality, all they are doing is multiplying them together (after subtracting each from 1)

[Pylae]

So for DKs:
60% from armor just for calculation's sake
5% frost presence
2% improved frost presence
5% blade barrier
and 20% icebound fortitude for the heck of it

= .4*.95*.98*.8 = .29792 ~ 70% mitigation?

[Molohk]

Source: Pylae So for DKs: 60% from armor just for calculation's sake 5% frost presence 2% improved frost presence 5% blade barrier and 20% icebound fortitude for the heck of it = .4*.95*.98*.8 = .29792 ~ 70% mitigation?

Yeah, but if you're a tank, you're really getting around 45% from IBF, because of the defense bonus. And of course, armor is not really "damage mitigation" its more like "physical damage mitigation".

Edit: It's 0.93 (5%+2% for FP), not 0.98

The thing to remember is that everything is multiplicative now.

[Pylae]

Ok, I was wondering about this.

No wonder IBF is getting nerfed...I'm still realizing just how good it is.

[Molohk]

It's frost presence that's getting nerfed, not IBF.

[Pylae]

Derr....me smart.

Having an 80 warrior tank and an 80 DK tank...is like...shield block supposed to in some way be comparable to icebound fortitude?

I mean...41% damage reduction for 18 seconds of every minute, or a doubled chance to block ~4000 10 seconds of every 40. Hmm........

Dylae