I just got a nice shiny new legendary gem. Bane of the Trapped, to be exact. Which has, as its primary effect:
Increase damage against enemies under the effects of control-impairing effects by X.
Obviously, it's in my best interest to ensure my enemies are under at least one of these effects at all times, for a constant boost to damage. My question is, what statuses count as control-impairing? I'm guessing slow does, as that's what the gem itself will give once it gets to rank 25, but until that point, I'm going to need something else to hit them with.
So what can I use to ensure this gem's damage boost gets as much uptime as possible?