Originally Posted by
Ronark
Thats ok.
Assuming you used DS in the tank group and that you have 30k HP as a DPS, the following would happen:
Maximum damage absorbed: 30k*0.4*5 = 60,000.
0 seconds: DG is cast
1 seconds: Tank takes 28,000 damage (12k redirected), 6000 from Gaseous Blight is redirect as well (1500 from 4 players) (18k total)
2 seconds: Tank takes another 28,000 damage, and another 6000 from Gaseous Blight redirected (32k total): If the paladin gets no heals, the effect stops prematurely and only prevents some damage.
3 seconds: Tank takes another 28,000 damage, and another 6000 from Gaseous Blight redirected (54k total)
4 seconds: Tank takes another 28,000 damage, and another 6000 from Gaseous Blight redirected: If the paladin gets heals, the effect stops here somewhere, however, only some damage is prevented.
Total amount of healing redirected: 60,000, minus the healing needed to heal the paladin, you actually prevent around 30,000 damage (You can argue that this "extra healing" can be negated with a holy paladin's Beacon of Light, but we are assuming that for any fight that beacon is being used to heal another tank, etc.).
Compare this value to the amount absrobed via AM for 6 seconds.
Using the Resistance formula: 100% * (Resistance shown on character sheet) / (K + Resistance shown on character sheet)
Where K is a value of 510 on level ??? (Boss) mobs.
When running base Shadow Aura, a player will on average take 20.3125% less damage.
When running Master Shadow Aura, a player will on average take 33.7662% less damage.
Rank 1 Gaseous Blight deals 3k damage to all players every second. Over a 6 second interval with no resistances, this is equal to 75,000 damage a second for a total of 450,000 damage.
With base Shadow Aura, each player takes 2391 damage every second, for a total of 358,650 damage.
With Master Shadow Aura, each play takes 1987 damage every second, for a total of 298,050 damage.
The damage difference is 60,600 FLAT damage reduction. Now, compare this to the 30,000 damage saved above.
Obviously, AM reduced provided more damage reduction than DSac- HOWEVER, this damage is not "controlled" like Dsac is.
The TL;DR version:
AM is better than Dsac when you want to reduce Magical damage dealt to all Raid members within a 6 second period.
Dsac is better to use in conjunction with a healer to provide controlled damage reduction for a specific person.
The end result, however, is that in EACH case, they BOTH provided about the same damage reduction (60k) available in this tier of gear.