When I equip Nightbringer, the Maelstrom lightning strikes turn scarlet, which implies full conversion (separately from the weapon’s ~50% global elemental conversion), but the description says nothing about Maelstrom / lightning at all. I tried testing with/without an additional source of lightning to vit conversion, but I couldn’t get the wind devils to use maelstrom from a distance, so couldn’t really tell which of their sub-skills were causing damage.
Appreciate your help as always!
Great question, I’m not sure myself. You can use DPYes to see what damage types and amounts are being dealt to a target and use “pet attack” on a dummy to get the Wind Devils to attack a target and use Maelstrom.
I am inclined to believe not. See below:
Note that item skill modifiers are not listed under Maelstrom on Wind Devil’s skilltree. Modifiers being under a parent skill are how those parent skills get modified.
only item modifier (so far) i’m aware of that actually direct converts maelstrom is acid devil conduit
last i tested morgo this summer mace did not
quick test with dpyes seem to confirm this again
Morgo with maelstrom 
devil’s morgo lightning dps with no maelstrom comparison 
acid conduit pure acid dps 
A similar thing happens with skybreaker circlet for Vire’s might. Despite volcanic stride being just pure fire/burn, the physical to lightning skill conversion on the helmet will convert the visual to sparks instead of lava. The damage is still fire/burn.
Yeah, that tracks. Thank you!
That’s really interesting — thank you!
That means it’s not converted then to vit damage?
So the technology exists for local modifiers to affect subskills. I wish they would all be revised and made to work like the conduit does. Would especially help new players since that is how everyone would expect it to work.
If I had to guess, 
will now correct the error and remove the conversion from the conduit. 
it’s not tech, it’s manually added entries for each modifier onto each of the pets’ skills, the pic Ceno posted demonstrates the tables devs need to add
In the case of the Morgo devil it kinda makes “semantics” sense; there is no actual conversion modifier on the item, the conversion is for phys/cold while maelstrom is lightning
You need global conversion , so standard solution is usually Nightbringer + Ring of Basti
Yeah–I’ve been using Trollheart Waistguard (lightning conversion, craftable) / Lunal’Valgoth’s Girdle (elemental conversion, target-farmable)
just keep in mind that those conversion are multiplicative and not additive (afaik)
If you have enough different sources of global conversion, your damage of the original type goes to zero, though.
Here I have an Archon using the Rotgheist set & Nightbringer, so well over 100% elemental-to-vit conversion, using Vire’s Might with Volcanic Stride. I have around 30 conversion on the chest, shoulders, set, and 50-ish on Nightbringer.
DPSYes is showing 0 fire damage, only vitality and a bit of acid/bleeding.
If the conversion was multiplicative, I’d expect (1 - 0.54) * (1-0.3) * (1-0.28) * (1-0.3) = 0.15% fire damage left. Instead, I get 0, suggesting to me it’s additive.
I tried again without the set and with a Luna girdle with 57% conversion. Still 0 fire damage.
So it seems to me it’s additive.
(Incidentally, I highly recommend the rotgheist + nighbringer archon build, incredibly fun.)
What @GIJW was probably referring to is that Elemental to [other damage type] and [specific damage type] to [other damage type] conversions don’t mix and are multiplicative.
So using an example:
This would first convert the Elemental (if converting Fire) to Aether leaving 50% Fire Damage remaining to be converted. This in turn will be 50% converted to Aether leaving 25% unconverted Fire Damage. So, in this example, ideally you want to have all Elemental to Aether conversion or all Fire to Aether conversion. Hope that helps!
There is also a predetermined order of conversion from equipment slots as outlined by here:
Ah, that makes more sense!
And thanks for sharing that order of operations post, I would never have guessed it would work that way.
yes it was the lightning to vit + elemental to vit conversion I was referring to.
