» Mon Dec 12, 2011 9:47 pm
For strict destruction DPS purposes, it shouldn't be too difficult to determine what the most efficient combination is. I'm going to make a lot of assumptions to avoid getting too in-depth.
We'll ignore magic cost (since it will probably be close to zero), the +50% bonus (since it buffs all DPS proportionally), as well as any extra damage being on fire causes (all fire spells cause burning anyway). I'm also going to assume that single-shot spells are fired once a second (makes the math easier), ignore dual casting (Fire Storm takes two hands, so halve it if you want).
Lets consider the fire spells. We can get the base damage, and use that to calculate the DPS. Since the cloak spells last for 60 seconds, I'm going to use a total damage possible over 60 seconds.
(single, 60 s total)
Flames - 8 / 480
Fire Bolt - 25 / 1500
Fire Rune - 50 / 3000
Fireball - 40 / 2400
Flame Cloak - 8 / 480 + Other
Incinerate - 60 / 3600
Wall of Flames - 50 / 3000
Fire Storm - 150 / 1800
There are obviously some issues with the assumptions (Fire Rune can be cast beforehand, but has unreliable DPS; the AOE spells can hit more than one creature, Flame Cloak can be combined with other spells but has a short range, bolt spells can cause stagger, dual casting bonuses, Fire Storm takes two hands and a charge up, etc.), but we can make some observations:
Against a single target, Flames, Fire Bolt, and Fire Rune are all trounced by Incinerate; it does more damage faster. Incinerate is better than Fireball and Wall of Flames unless there is more than one target in range.
Flame cloak can be combined with other spells to (almost) add 480 damage to the 60 s total assuming that enemies are constantly in its range. Admittedly, though, it's usually better to not have enemies at close range for 60 seconds, so this one is probably a pass.
Wall of Flames and Fireball are close in multiple target damage, though I'll probably give Fireball the win because it can stagger and doesn't require the enemy to stand in the effect. Otherwise, Wall of Flames trounces Fire Rune (it's almost a rune hose).
Fire Storm is useless tripe.
To conclude, I'd say that the go-to destruction spells are the fire/frost/shock equivalents of Incinerate and Fireball, depending on the targets. Wall of Flames also might be useful if you can ensure it is reliably doing damage. Everything else is a waste.