i sorted
i sorted this out with my sk by adding this line to my combat sub,
/if (${SpawnCount[npc radius 90]}>1) {
/call cast "vilify" gem2 2s
}
( if there are more then 1 mobs in camp he will cast his AE taunt spell ).
not sure what you would do for another class, hope this helps or gives you an idea, tho i havent tryed this in a while i dont use my merc to battle with, just for a res now and then and to get a buff if they drop.