To get the achievement for killing the boss without killing any guardians. Clear the path down to him. Have your tank stand on the water fountain above his room. Then use a hunters MD to pull the boss. After the boss is engaged run all the way back to the platform at the entrance (the one that run down the web right as you zone in). You can hear the emote for the adds spawning but they never actually get to you. Turns this fight into an easy tank and spank. Plus you get the achievement. Can provide video or pictures if needed.