here dude, a event Hp i made to have 5 spawns when a mob reaches a certain % of hp, it works, so this may give you some idea's 
 
 
sub EVENT_ATTACK {    
   quest::shout("WHO DARES CHALLENGE ME?  I AM THE LESSER OVERKING!!, YOUR QUEST ENDS HERE, MORTALS!");   
   quest::spawn(189142,0,0,($x-10),$y,$z);    
   quest::spawn(189142,0,0,($x+10),$y,$z);    
   quest::spawn(189142,0,0,($x-20),$y,$z);    
   quest::spawn(189142,0,0,($x+20),$y,$z);    
   quest::spawn(189142,0,0,$x,($y+10),$z);    
}    
   
sub EVENT_HP {    
   if($hpevent == 70) {    
      firstevent();    
   }    
   if($hpevent == 30) {    
      secondevent();    
   }    
} 
		
	
		
		
		
		
		
		
			
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