Originally Posted by Demi9OD
I'm new to this but unless you are taking consistent damage I don't believe SL is worth the global or mana to cast.
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Siphon Life has a Damage per Cast Time greater than shadowbolt. Thus, like Immolate, as long as it will run most of its duration, it increases your dps.
It does more damage than a shadowbolt (including crits) and takes 1 second less time to cast. If you are not using it on long boss fights, you are losing dps.
Here is a better question.
How many ticks does it take for dot (X) to become more useful than casting shadow bolts instead?
900 shadow damage
800 fire
10% crit
6% hit
fully talented DoTs
2/5 suppression.
5/5 bane
CoS, misery, and such are factored out, since they amplify everything by the same amount and don't change the calculation.
Corruption and UA will deal about 390 per tick (more for corruption, less for UA, but similar for this approximation)
Shadow bolt does 1440 damage. But it takes 5/3 as long to cast. So corruption and UA need to deal 3/5 of the SB damage to be at least equal. So, this is 864 damage.
If they have only 2 ticks, they are not as good, and if they have 3, they are more valuable.
Corruption takes 9 seconds from time of cast to get 3 ticks, UA takes 10.5.
The dps loss is small if there is only 2 ticks, if you factor in the shadow bolt travel time.
Roughly, the break-even boundary is between 2 and 3 ticks.
CoA: this is harder, since the first 4 ticks are diminished. We would have to reach that same 864 damage before the Mob died to be better than shadow bolt. CoA does 3230 damage with this gear/spec. the middle 4 ticks do 3230/12 = 269 damage. The first ticks will be about 60 damage less each. I am not sure if imp. CoA affects the base damage and the dot damage difference or not (+spell damage is spread evenly over each tick).
Anyhow, that takes about 4 to 5 ticks, or 8 to 10 seconds.
Much like Corruption and UA, if a target lives for 10ish seconds after a cast, it is better than shadowbolt.
What about immolate? Well since its damage is front-loaded, it is even easier to reach the 864 damage barrier compared to a 1440 shadow bolt. However, it will vary depending on curses, shadow weaving, and improved scorch debuffs. Assuming none of these:
The initial damage is about 500, and the ticks are about 225. So, it would take 2 ticks or so to equal shadow bolt. This takes 7.5 seconds.
Ok, lastly siphon life.
1.5 second cast time, 10 ticks 3 seconds apart, and 1634 damage. Each tick does 163 damage. It takes 6 ticks (18 seconds) for it to be more damage per cast time than shadowbolt, unless you had a siphon / shadow and flame build -- which would be odd.
The basics are, for all your Dots and in almost any spec, if the target lives for 10 seconds after you start casting the spell, DoTs are better dps than shadowbolt. The only exception is Siphon Life, which takes 18 to 20 seconds to pay off.
If a target lives between 12 and20 seconds, the most dps is:
CoA>UA>Corr>Immo> SB >SB >SB >SB
Add Siphon if it will run its duration, and switching to another curse doesn't hurt much, especially since you can often do it before you could otherwise dps due to aggro issues.