void main(){

  effect eSwarm;
  object oPC = GetLastUsedBy();
  if (!GetIsPC(oPC)) return;


 object oTarget;
 oTarget = GetObjectByTag("PC_swarm_location");


  eSwarm = EffectSwarm(TRUE,"dmvrock001");
  ApplyEffectToObject(DURATION_TYPE_INSTANT,eSwarm,oTarget,120.0f);
}