I am thinking about getting the following Necklace
<Death Bracelet Necklace>
Attacking has a 5% chance to decrease target's HP -324 every second; lasts 10 sec
As they've already said the keyword is Attacking
, the fact that the effect itself is a dot, doesn't change the situation. And no, dots can't activate an attack even if the effect is a dot: so parasite won't trigger that proc.
Also mind that some of the descriptions (Expecially for higher level items) are incorrect, so some procs on attack are actually procs on attack AND cast (I don't think it's your case). To test it I get in party with as many ppl as I can and spam purify wind, if it procs it's on cast as well, if it doesn't after 20 winds it's on attack only.
: Autoattacks, and every skill (physical or magical) that deals direct damage (burning metal is NOT an attack, Oil Bomb couts as an attack)
: Buff, debuff, dot, heals...: I think the rule is every skill that doesn't inflict direct damage, but since it's usually cast+attk, it's harder to say what's cast only and not cast and attack
I was told that Procs trigger at the moment of cast; and with some (like sadness ring that doubles the very hit that procs it and not the next one) it's indeed this way: but I can't confirm that in every case trigger is at cast/attack before the skill/attack hits even if I do beilive that it works this way