My understanding is that they will not stack from the same caster. Sadly.
@Hakeswell
Union Ilservian, Evinlea
Defiant Expeditor, Hakeswell
Arc: 70119 Hellion Initiation
The -regen on Evenom stacks, but that's the only bit of the two that does. (It's worth it, two applications is -100% regen >.>
They're sick enough as is though!
Holy [censored] I'm glad you posted this thread. I've been stacking debuff poison attacks assuming that they worked. You know, because it just makes sense that they would. Does this mean that most debuff attacks don't stack? (Like Infridge from Cold Domination?)
-jared
PS: Forgive the newbie-ness, but where do you find this info?
Found it off tests done on the US servers, I can't think of a debuff that does stack but I won't rule it out. I just know that bar the -regen poison debuffs don't stack with themselves, it'd be insane if they did!(So spread that love around ^^)
Noxious gas and evenom do overlap though on the -def and -res, and god I love it when I can get both on something, they drop like rocks 
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PS: Forgive the newbie-ness, but where do you find this info?
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Or here. Some of it not fully updated, but fairly reliable.
CoX 50s: <ill/rad> <ice/ice> <fire/kin> <grav/sonic> <ice/storm> <earth/kin> <kin/elec> <cold/psy> <thugs/dark> <fire/dark> <dark/elec> <night widow> <EM/ninj> <mind/icy>
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Found it off tests done on the US servers, I can't think of a debuff that does stack but I won't rule it out. I just know that bar the -regen poison debuffs don't stack with themselves, it'd be insane if they did!(So spread that love around ^^)
Noxious gas and evenom do overlap though on the -def and -res, and god I love it when I can get both on something, they drop like rocks
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Any LBAoE stacks with itself.
Tar Patch
Disruption Arrow
Being the only two I can think of at this very moment
"Well, they found my diary today.
They were appropriately appalled
at the discovery of the eight victims
They're now putting it all together.
Women wrapped in silk
with one leg missing
Eight legs, one body, silk,
spider, brilliant!"
I though the single target -slow -recharges also stack with eachother? At least the Council ice snipe shot do stack 
(-dmg/spd from siphon damage/speed also i believe).
aka, i thought everything outside acc/res/def/regen (and 1 i most probably forgot) stack from 1 power.
50)Sinergy X/(50)Mika.
(50)MaceX/(50)Encore
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You could be right, the -slow from Ice Blast seems to stack with itself.
The only powers I am sure stack with themselves are LBAoEs though, as they're each treated as a pet, a seperate entity and not just a power used by the same character
"Well, they found my diary today.
They were appropriately appalled
at the discovery of the eight victims
They're now putting it all together.
Women wrapped in silk
with one leg missing
Eight legs, one body, silk,
spider, brilliant!"
Hi guys
Here is my question : there is 2 big single target debuff in this line, called Envenom and Weaken.
I'd like to know if you cast several Envenom or Weaken on one target, the effect of each of those powers stack (I mean if i manage to cast 2 weaken on one target for example, this target get twice the debuff effects)
Thanks for ur answers and good game all