I'm studying different effects on the dps of mercs. In a controlled environment Well I'd like to, but I know you can't get them to attack the dummies in the guild hall. Do they have the parse guys in the arena you can spawn on test, or is that just betas ? If so can you get mercenaries to attack them? Otherwise I think the best option is that guy in the first Shards Landing mission, right?
what are you trying to find out? just the dps of mercs? you can do that on any trash mob really. i do know wizard mercs are better dps than the melee ones.