Great. Ty!
So only one debuff of the Voidheart Ring can only be active on the target? If both rings proc at the same time, the debuff will still be applied once?
Or do you mean that each is handled separately (as two procs with -10% resist) and not as one proc with -20% resist?
Yes, only one debuff is active on the target. The percentage chance of activating is increased, not the resist reduction.
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Is that because it’s considered to be the same source or something?
Yeah, two sources of the same granted skill. Two Voidhearts means one granted skill with boosted chance to be activated.
The same applies to granted skills like (granted version of) Doom Bolt, etc.
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to clarify; it’s because it’s specifically a debuff, and same debuff don’t stack
if it was a regular non debuff class granted skill, they could stack
- Plague Bite poison stacks if using 2 swords, as each granted skill is their own source/count as separate DoT source
*it’s also worth to mention, re the doom bolt thing, it’s not on a technical level increasing the chance for “a” skill to proc,
They proc individually and if normal attack/buff proc they will then happen individually/potentially at the same time or in succession even if 1/the first was gone on cooldown.
But as this/Void Heart is specifically a debuff and it doesn’t stack it can be more said it increases the chances for the debuff to be applied
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This is an interesting read but I’ve read elsewhere that
Raging Tempest (-x% elemental R) and Elemental Storm (flat x reduced elemental R for 2 seconds)
don’t stack on a single enemy while according to this thread they should.
Was this changed in a recent patch so that only one RR effect can be active on a single enemy at any given time no matter the wording?
whoever wrote that was incorrect
no, the system has been the same for over 8 years (if not more?)
*it’s been tested and retested and confirmed several times
to the point the original order (provided by the game?) was deemed incorrect
originally it was thought it was -x% n’th reduced then %reduced
after players retested this it was confirmed the true order was as described earlier -x%, %reduced, n’th reduced - the 3 stacking in this very manner the new guide lays out
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Thank you for the clarification!
forgot to link it before, if you want to have a look at the very in-depth examination by our usual mechanic buster Denis Actual Resist Reduction formula
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Thank you!
So n reduced reduction is only effective if the monster has flat RR instead of/additional to percentage based RR?
On a side note:
Raging tempest applies -x % enemy DR. Since there is no duration, this should only count for each hit by the wind devil and not my hits on the same monster.
This would mean I either max the Wind Devils chain or ignore it altogether.
Do I get this right?
no, resist is resist
mathematically there is no distinguishing between -10% elemental res, or 10 reduced elemental res, they both subtract an absolute 10 value
the mechanical interaction purely comes into play when using %reduced, as it happens between the flat subtraction
enemy has 80 res,
-10% ele res monster now has 70
10 reduced ele res, monster now has 60
playing with %reduced
-10% ele res monster now has 70
20%reduced ele res, monster now has 56 res remaining
monster has 80 res
20% reduced ele, monster now has 64 res
10reduced ele res, monster now has 54
all 3
80-10 = 70
70*0.8 = 56
56 reduced by 10 = 46
the -x% and n’th reduced/“flat” RR doesnt’ change in effect or value themselves, but as they interact differenced with %reduced it means %reduced get a highly variable value depending on your existing RR and monster current resist
*this doesn’t mean you should skip -x% to get a higher value out of %reduced, as -x% is abundant, and shredding enemy into negative resist will still be useful
*keep in mind the “elemental” factor/descriptor is only in relation to which type of the resist gets reduced,
unspecified shred like “20 reduced target’s res” just subtract 20 from all dmg res (not CC res/tertiary res),
likewise if the %reduced is unspecified or specified as smoething else, 20% reduced targets physical res naturally then only impacts physical dmg specifically
DR is usually Damage Reduct, RR = resist reduct, slight side note
Raging tempest is applied and reapplied every second, simply because it’s aura debuff, so it ticks everytime devil ticks, non specified duration is normal for auras and debuffs/pseudo dots ticking every second
If you notice there is technically no duration specified on the RR itself for Curse of Frailty, Aura of Censure and Devouring swarm, Thermite Mines, as they all function the same but with varying upkeep.
TLDR, you 1pt devil, max raging tempest/always max your RR, (1pt maelstrom to make it a better devo proccer even if you’re not a lightnign/electrocute or wind devil mained build)
*also do let me know if i just confused the heck out of you instead/muddied the waters or explained things poorly by not being succinct 
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Many many thanks for your explanation, patience and willingness to share your knowledge!
Here’s a little summary of what I think I’ve learned:
RR in general:
-x% reduced is an additive bonus which does stack with the same bonus from other sources.
x% reduced is a multiplicative bonus which doesn’t stack with the same bonus from other sources.
n reduced is an additive bonus which doesn’t stack with the same bonus from other sources.
Raging Tempest:
The RR is a status effect which is more or less constantly applied thus supporting any elemental attack on the affected target.
A special thank you for the hint on Maelstrom to help with those devotion procs. Will respec my lightning Eye of Reckoning char to Wind Devils 1-MAX-1. 
correct 
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This does help a lot.
Thank you for this post, @Gnomish_Inquisition ! This explanation for “dummies” is exactly what I needed. And my conclusion of the math is, that -X% res is a must, Y reduced and Z% reduced are nice to have.
since Y reduced is the same as -x% i would/i generally consider it a must too,
specially since it’s simply always possible to include a source somewhere around minimum 18-20
Btw, for items like Edge of Death, dual wielding them does not means the flat reduction mods for reaping strike to stack and become 36 right?
nope, only the highest one counts, so it’ll still be 18.
Funnily enough, the damage conversion (Markovian’s Advantage and Reaping Strike) is counted twice, if this particular weapon is dual wielded.