My group consists of pld/war/sch/whm/mnk/drg/smn/brd. Our paladin is the maintank. The death dancers spawn a specific percent. I believe our warrior has things timed so he has butcher block available as soon as the first lamia spawns. I think he pops unchained as well as berserk. No one pulls off him. Usually the first spawn is dead or near death when the second one spawns (depends if one of the melee wind up with shriek). We typically keep a single renaud up (kited by bard, may try summoner this week).