Kunzar Ku'Juch - Effectiveness of Aggro?

[Ashimar]

So i bought this weapon for 1k and it procs Engulfing Darkness.
Slight Problem. Since its a lvl 11 Necro spell pretty much every mob
thats above 40 or so resists it, and since it resists, it wont grab aggro will it?

Which leads me to another question, if the mob resists the weapon proc,
will it still have a chance at grabbing the aggro?

Currently i have a SSOY and i replaced the Kisch der Pav with Kunzar Ku'Juch.
Perhaps i should just grab another SSOY? Ringed maces of Ykesha are probably
going to skyrocket so i dont want to get one unless its cheap. Suggestions?