Originally Posted by Omegaspirit
Bane of Doom doesn't update itself every tick unlike most other damage over time spells. So for the BoD to gain the benefit of Demon Soul you need to cast it while the buff is up.
This is true with trinket buffs and other such procs as well. That is why Rune of Zeth is in the BiS profile because you can use it every time you need to cast a new Bane of Doom.
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Originally Posted by Notoris
Check the Opening Post's chapter on 'Optimal Opener' for info on DoT behaviour regarding this subject.
Will check if BoD is an exception if nooene beats me to it.
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I did and found that BoD does indeed check up on debuffs on the target each tick simply by applying a CoE after 30 secs of BoD and watching the last 2 ticks go up 8% (no crits).
And as the OP and Morninglory correctly state what happens with your spell after it lands and what you do to buff yourself after are completely different things. Once your dot leaves your hands it only cares for stuff on the target.
As the OP also says there is a curiousity with Shadow Embrace since it though being a debuff on the target acts like it is a buff on those applying stuff to the target instead. So extra stacks of Shadow Embrace do not get accounted for when already applied dots tick.
To clearify:
-You press a hot key to cast corruption on your target
-Dot gathers info on all your data like sp, haste, mastery and so forth and remembers it
-Dot lands on target, checks the target's debuffs and starts timing
-Dot starts ticking checking the target's data and adding your stored info each time it ticks
So the dot gets a pack from you with it that doesn't change and it gets a pack from the target that is prone to change and your dot tick is a result of those.
I hope that makes things more clear and not more complicated
