I believe most of 'them' to be bots. Seen at least 5 different of 'these groups'. All follow one or don't move react unless 'leader' moves. They're mostly all same class/level and with same gear, using same attacks/methods.

These fiends ruin many a games economy and need to be stomped. Why should anyone be able to run around attacking 5~8 at once. When being attacked, having damage spread-out amongst many character and having an extra x-amount of "arms" to back-up 'leader' to heal/rez/buff.. -.-