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aresius
10-27-2011, 12:01 PM
Small question regarding prot pally cd mechanics.
I was reading around some forum (forgot which) the other day and came by a guy stating that Argent defender and divine protection stacked additively when used simultaneously (20%+20% = 40%). I alweys beleived all cooldowns stacked multiplicatively (20% of total damage, then 20% of remaining). He said that GoAK stacked multiplicatively with each of them, its just additive when its between those two specificly.
I just wanted to ask you guys if you could confirm/deny this information.

Fetzie
10-27-2011, 01:16 PM
Multiplicatively (god that is an aweful word)

Say we have a 100 damage swing and a tank stacks AD and unglyphed DivP. AD will reduce its damage to 80. Divine Protection (unglyphed) will reduce it to 64 damage.

Quinafoi
10-27-2011, 03:46 PM
Deleted my prior post cause it wasn't entirely accurate and I can explain things better.

What effects are additive?

Combat table events.
Hit, Crit, Miss, Dodge, Parry, and Block are all additive. A talent for instance which increases your chance to Crit by a flat percentage will always have that exact effect such as Nature's Majesty (http://www.wowhead.com/spell=35364). The ability Shield Block (http://www.wowhead.com/spell=2565) adds (up to) exactly 25% chance to block. This applies to both offensive and defensive combat events.
Damage reduction (static).
Shields which absorb a static amount of damage add to the total amount shielded. If a Power Word: Shield (http://www.wowhead.com/spell=17) were cast on you that will absorb 20,000 damage, and you had Blood Shield (http://www.wowhead.com/spell=77513) for 5,000 damage these two effects combined would absorb exactly 25,000 damage.
What effects multiply by each other?
Haste.
All sources of haste are evaluated independent of each other. A 5% casting increase from a Moonkin Form (http://www.wowhead.com/spell=24858)'s aura is multiplied by say a 10% Haste you have from Haste Rating to get a net effect of 15.5% Haste. Note that Haste stacks multiplicatively however buffs to Haste Rating such as a trinket proc do not because such a buff isn't independent, it effects a value you were already accounting for (it changes that 10% to something higher before it was multiplied by everything else).
Damage / healing (percent).
All percentage based damage reductions are multipliers. If you have 50% reduction from armor then a physical attack does 50% less damage. If you also blocked that attack with a shield you take 35% of the unreduced amount (50% * 70%). If you are in Defensive Stance that also took 10% more damage off reducing it to 31.5% of the original damage (50% * 70% * 90%). If you were also under the effect of Shield Wall it would drop to 18.9% of the original damage (50% * 70% * 90% * 60%). This also applies on the other end of the spectrum for throughput. Tree of Life which is a 15% healing buff stack multiplicatively with Master Shapeshifter which is a 4% healing buff to net a 19.6% effect.
Movement speed.
Effects which increase movement speed multiply together (provided they are not mutually exclusive). For example, Crusader Aura (http://www.wowhead.com/spell=32223) will increase the speed of a +60% speed mount by less than it would for a +310% speed mount.

Fetzie
10-27-2011, 03:49 PM
I am very sure that Crusader Aura is not a flat 20% movement speed, and various addons as well as the blizzard character pane UI say that my 310% flight (310% on top of the standard 100% when running) is actually 492% movement speed, not 430%.

410 x 1.2 = 492.

So the mounted speed increase is additive, like you said, but the aura speed increase is multiplicative.

Quinafoi
10-27-2011, 04:01 PM
And of course my browser is freaking out at me again while I'm trying to edit that post. I'm trying to fix that. I must have missed when the change was applied to movement speed increases. They made it so they don't stack like they used to a long time ago so I'm not sure exactly when they changed it from additive to multiplicative.
*edit*
Fixed the original list.

Fetzie
10-27-2011, 04:14 PM
Crusader Aura has been multiplicative since my paladin has been my main character (end of TBC to present day) if I am not totally mistaken. It may have been like this before, I don't know.