I really like this ability thematically and visually. But the RNG of it is just terrible. It sucks so fucking bad to watch ANY other class pop an AoE on demand on a pack, only for you to have to pray for a proc... which usually only comes when there are 2 mobs left from a pack of 10.
Crimson Tempest is an option, but again you have to get the CP, then it's an AoE slow ticking DoT.
Meanwhile the mobs have been melted by:
- Bladestorm
- Eye Beam
- Whatever the fuck mages are doing
- etc
It's not a problem just with Assassination AoE, Affliction does have a similar problem. But doesn't it just seem like an obvious fix is to make Poison Vial on demand and tune the numbers so it's not way out of line?