Cha +2 isn't the point. The wand is given out as part of a task to get the Dromeks to talk to you. When used on the *specified* Dromeks, they will freeze (even if they have already started beating on you) and respond to a hail(completing a task stage).
... and *then* you can kill them.
Have your Bandolier ready to switch back to melee weapons quickly and beware of adds (upon which the wand will probably not have the same effect).