Originally Posted by Nyuu
Depending on what the mana situation ends up being like after the patch for arcane, I was wondering if taking incanter's absorption (and maybe the talent for mana shield?) could be a dps gain on any fight where there is a lot of raid damage going on. On something like KT where you can throw up a frostward which absorbs around 3700 if memory serves, (i'm at work and can't check) that should give 555 dmg, 15% of absorbed > spell damage, for 10 seconds. Is that enough to justify using a gcd on the ward as opposed to continuing your rotation?
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It absorbs 1950+80.57%*SPower, coefficient is 1.5/3.5(instant)*1.88("healing" spell).
So with gear, if you absorb 4k for 523 mana, you get 600 SP for 10s, which adds about 9k damage according to Rawr.
You sacrifice 1 GCD, which is about 7k damage. So it's a small gain of 2k damage every 30 seconds.
It becomes a much higher gain when you're casting FW when running of Fire/Blizzard/Void Zone or to a Spine/Portal for more than 1 GCD (the first GCD is always used for Arcane Barrage).
If
[Glyph of Frost Ward] works on the spell in question, the better.
There is also the thing that it actually does something (absorb damage), which the damage junkies will probably consider an irrelevant side effect
So, in completely stationary fights, it's a 1% DPS gain for 3 points, which is bad.
It's never picking worth over a even a semi-DPS talent if you only care about damage.
(I.e. "I never cast Frost Ward if I don't have the talent.")
In mobile fights with enough damage every 30s, it's a 5% DPS gain for 3 points, which is quite good.
It's better than Mind Mastery or Arcane Potency and much better than Arcane Mind, Incineration or Spell Impact.
(It's also much better than Arcane Meditation/Concentration/Meditation in 5 minute fights without JoW, but mana looks much worse in long fights or without 2T7 Mana Gems.)
TLDR on Incanter's Absorption
It's a very good talent if you take consistent damage and either cast Wards on the move or would cast them anyway for your healers.
The best place to take the points for it is Incineration. Or Arcane Mind/Meditation according to Rawr.
It's not worth taking if there is no regular raid damage, or if you would not cast Wards at all.