I believe none of the Necro skill have poison in them, I'm not 100% sure though. I believe the skill you have spreads Disease, which is quite different from poison even if they have the same color degen.
So your poison Hilt would not extend the duration of the Disease that you cast on the foe.
And if someone else has poisoned them I believe the axe would extend the duration since you're attacking the foe that matches the condition description.
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