QUOTE (yesferatu @ Mar 17 2014, 12:35 PM)
I'd like to be able to show up at a disturbance, encounter a nasty spirit and stick it in a jar instead of killing it.
Is that kind of thing possible?
First, you have to remember when you defeat a spirit via damage, it's not dead. It's connection to this plane is disrupted and it is forced back to it's own plane.
Now some spirits are big and bad enough that maybe flat out destroying that connection might not be feasible or it's got enough hooks that it wont stay away long, so containment may be a preferable option as along term option.
However, keep in mind which do YOU think will piss off the spirit more, disruption and banishment or Containment/imprisonment?
It's been done before in the fluff/novels, but the practices are fairly obscure and can not imagine they would be easy as you are sort of messing with planar forces.
This could be an interesting metamagic based on the possession traditions, though some other traditions might also look at this as containing evil forces.