You have to Beat on the Nests until they break open. Not sure if Blunt weapons work better than Slashing or peircing .. but my Zerker lvl 54 with his epic can break them open. Takes lots of hacking cause you miss so much. But once the nest is open they do agro. I tried a few Spells on my druyid also to hit the nest but the nests resist alot .. never had one do any damage. Druid is lvl 55. I hope this helps you