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Which would be awesome if the effect didn't break after one hit. One 2K Blizzard crit instead of one 1K hit isn't going to make much of a difference compared to the full AOE rotation fire has.
Fire's AoE is truly unimpressive in Heroics. Or, more specifically, it is only slightly more damage for a much higher mana cost. It's good on paper, but terrible in practice--things die too fast for it.
For the past week I've been Fire on my Mage. In heroics, I think I've had maybe 3 LBs actually explode on trash mobs. My AoE when trying to use them has been abyssmal.
And my DpS with 3 FS casts is lower than it was as Arcane in the same instances. The thing is, as Fire spec, your Flamestrikes aren't really more impressive.
Arcane buffs that go to FS: +3% Damage, +3% Spell Damage, +6% haste, 15% of Intellect as Spell Power, +3% crit damage. Add to that increased spirit which translates to crit from Molten Armor.
Now note that ALL of these buffs also buff Blizzard.
Fire buffs that go to FS: 40% damage/4 seconds from crits, +6% crit, +3% damage, +6% crit (again), +10% fire damage, +3% crit. Of these, only +3% crit and +3% damage apply to Blizzard (I may have missed one, to be fair).
Now, let's look at the abilities used in either (or both) rotations:
FS9 is 873 to 1067 damage with 780 over 8 seconds in a small area, with a cast time of 2 seconds. The initial burst gets 23.57% of spell power, and the DoT gets 48.8%.
FS8 is 688 to 842 damage with 620 over 8 seconds in a small area, with a cast time of 2 seconds. The initial burst gets 23.57% of spell power, and the DoT gets 48.8%.
FS 7 is 471 to 575 damage with 424 over 8 seconds in a small area, with a cast time of 2 seconds. The initial burst gets 23.57% of spell power, and the DoT gets 48.8%.
Blizzard is 3408 damage in a large area, channeled over 8 seconds. The entire spell gets 114.29% of spell power as damage.
For this (very simple) comparison, we will be using my Mage. I have 2200 SP in Fire with 20% chance to crit (both rounded down slightly), 1230 Intellect and 600 spirit.
That would give my spells the following values in Fire spec:
FS9 = [((970+519)+(780+1073.6))*1.13]/2 = 1888.23 DpS on a non crit. When it crits, it becomes: [1.4(((2*(970+519))+(780+1073.6))*1.13]/2 = 3402.882 DpS I do not recall if the tics can be criticals or not, but if they can, then we can add 600 to each value (non-crit is 2488.23 overall DpS and a crit is 4K overall DpS).
So, yes, it is decent.
However, take Arcane (same gear, but higher stats due to talents):
***Note, I AM factoring in the 3% from Arcane Empowerment, because we are considering Heroics so it is perfectly conceivably that you may have no one else in the party applying the buff.***
*Arcane's spell power for this comparison is 2385 due to the 15% Int->SP*
FS9 = [((970+562)+(780+1164))*1.06]/1.88 = 1959.9 on a non crit. If the DoTs can crit, we add 660 to this value. If the main strike is a crit, the damage is 2823.66 (with another 660 if the DoT effect can crit).
Even before I go on, it is clear that Fire's AoE is NOT that superior to Arcane's. Fire will only crit 4.x% more of the time than Arcane. My mage had 32% crit as Arcane. So, assuming 32% vs. 36% active crit on FS...
(1888.23)*.64 + (3402.882)*.36 = 1208.467 + 1225.04 = 2433.505 DpS expected from FS over an entire dungeon, if each casts's DoT can run it's course. If the DoT can crit, this is 3K.
With Arcane, it is:
1959.9 *.7 + 2823.66 *.3 = 1371.91 + 847.08 = 2219 DpS from Arcane for the whole run, assuming the Dot can run it's course. With DoT crits, it is 2879 DpS.
So, a whole spec change has only a 121 DpS difference between the two main spells (Fire will have a smaller DpS boost over Arcane as you downrank).
However, Arcane manages to get 1100 or so DpS out of Blizzard, when Fire could only get 960 DpS out of it.
So, we have two options. Fire can do FSx3 and then spam Fireballs or do FSx3 and use Blizzard. Living Bomb isn't an option as it will almost certainly not explode in anything but the Frozen Halls instances. If they choose the first one, Arcane ends up with SUPERIOR AoE DpS. If they choose the latter, they just SLIGHTLY edge out Arcane by being quite a bit more Mana inefficient.
In practice, Fire just isn't the better AoE spec *in heroics*. If you have raid encounters where you can place LB on adds, though, or the trash doesn't die in under 12 seconds, then Fire is superior.
Not to mention that you should see a 2-3K DpS drop from Arcane to Fire, minimum, on bosses due to the loss of CDs (as has been discussed in this thread, I believe, in relation to DKs). If you have a +magic damage buff from DKs, Druids or Locks, that can go up to 4K. Yes. I HAVE done 9K DpS on bosses in Heroics with my Arcane spec due to CDs lasting nearly the whole fight. Once I would have gotten 10K, but those skeleton adds on Prince whatever-his-name-is increased my fight time. :(
Best I've done with Fire is 5.5K so far. Oh, and I was hitting 9-10K BEFORE 2pc T10. I switched to Fire very shortly after getting it and hadn't really tested Arcane with it.
But this wasn't off topic at all--nor was I bored. >.<