Hee! I thought you'd already caught that, Lavi! Oh, well.
My most adventurous tactic for taking out these guys was when I was the Thief for one of my Multiplayer games: I transferred all the good equipment to myself, booted everyone else out of the party, and took out the entire floor solo, using Arrows of Detonation, the Dagger of Venom, and the Boots of Speed. Ohhhhh, that yummy EXP! Then I got everybody back on the team and we went our merry way.