[trevius]

Personally, I like to run everything from 1 NPC so there is less scripts involved, but sometimes that can get a little tricky and it is probably best for you to start off as simple as possible until you are comfortable moving to more complex stuff.

To run it all from the boss, would take a bit more information. But, a simple example would be like this:

sub EVENT_ATTACK {

	# Get each of the NPC casters:
	my $AddNPC1 = $entity_list->GetMobByNpcTypeID(999425);
	my $AddNPC2 = $entity_list->GetMobByNpcTypeID(999426);
	my $AddNPC3 = $entity_list->GetMobByNpcTypeID(999427);
	my $AddNPC4 = $entity_list->GetMobByNpcTypeID(999428);
	
	# Get a random entry on Laibach's hate list
	my $HateTarget = $npc->GetHateRandom();
	# Get the ID of that hate entry for use with CastSpell
	my $HateTargetID = $HateTarget->GetID();
	
	# Make sure you got him before using $laibach as a pointer
	if($AddNPC1)
	{
		# Cast a spell on the random hate target (Courage in this example)
		$AddNPC1->CastSpell(11, $HateTargetID);
	}
	if($AddNPC2)
	{
		# Cast a spell on the random hate target (Courage in this example)
		$AddNPC2->CastSpell(11, $HateTargetID);
	}
	if($AddNPC3)
	{
		# Cast a spell on the random hate target (Courage in this example)
		$AddNPC3->CastSpell(11, $HateTargetID);
	}
	if($AddNPC4)
	{
		# Cast a spell on the random hate target (Courage in this example)
		$AddNPC4->CastSpell(11, $HateTargetID);
	}

}

That will be run from your boss and you will need to edit the NPC ID for each of the adds that you have, assuming they each have their own unique NPC Type IDs. This version will make it so that each of your adds all concentrate on the same random hate target instead of each of them choosing a separate random hate target. You can get separate random hate targets for each one if you want easy enough though.