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EDIT:
Combustion Support does not actually work in any of the ignite builds using it on a utility skill, as figured out by /u/tubexi and confirmed by /u/LocalIdentity1 (via GGG):
So I found out, and what the other person posted is correct. If the skill linked to combustion is not dealing the highest damage ignite then the neg res will not be applied or will be removed if another higher damage ignite is inflicted after the combustion one.
Apparently this was an optimisation ggg made a while ago but they think it should be fixed, just not sure when.
It turns out that it's even more complicated than that - the -10% res of combustion appear to only be overwritten when a stronger Ignite is applied, i.e. if you keep applying the smaller ignite with combustion, then you should be getting the benefits. However there appear to be a bunch of differing results that people are getting:
If this theory of "latest ignite matters for combustion" is true, then the arcanist brand setup I have recommended originally is the one to go with: Arcanist Brand - Combustion Support - Flame Surge - Wave of Conviction/ Purifying Flame
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READ THE ABOVE EDIT FIRST ^
Original post is below:
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Since I still see it on poe.ninja even on really high-level profiles:
Quite a few characters still use the 4L Arcanist Brand - Combustion Support - Flame Surge - Flammability. Combustion Support is a dead link here:
Flame Surge says:
Cannot Ignite
Your damage modifiers don't apply to this burning ground.
Combustion Support says:
Enemies Ignited by Supported Skills have -10% to Fire Resistance
That's why your Arcanist Brand 4L should have Combustion Support Flammability- Wave of Conviction (for exposure) - Flame Surge - Arcanist Brand. You should have time to self-cast your Flammability in most boss fights and if you find that you do not, you'll have to dump it in a 5L or on a ring.
EDIT: Swapped out Purifying Flame for Wave of Conviction
I like running Purifying Flame instead of Wave of Conviction and get my exposure from the Eater of Worlds glove implicit and Purifying Flame gives consecrated ground.
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