From what I heard many people are disregarding IA because lighting damage causes concussed and minor vulnerable, so when I got a charged malestrom lighting staff I was excited to use it on my healer and replace IA with Worm.
Unfortunately though it is very unreliable for me and some times does not proc for a while and distracts me from healing my team.
I usually place elemental blockade and heavy attack. It does work more on trash mobs though, but didnt notice it on bosses, maybe UI not sure.
Is there something I'm missing here? or is it really not reliable?