Curse doll. Only place where I dont feel bad for using it so far.
The description for the curse doll doesn't do the effect justice. It doesn't just "weaken" the enemy, it makes it so they do no damage when they hit you and take like 3x more damage from attacks. It basically makes them a punching bag that just staggers you once a while.
Im not sure if you can use it though if you sided with Inquisition. But then again if you have a musket it should be pretty easy anyway.