@Override
	public boolean invoke(MOB mob, Vector commands, Physical givenTarget, boolean auto, int asLevel)
	{
		final Room target=mob.location();
		if(target==null) return false;

		if(target.fetchEffect(this.ID())!=null)
		{
			mob.tell(mob,null,null,_("Projectiles are already slow here!"));
			return false;
		}
		if(!super.invoke(mob,commands,givenTarget,auto,asLevel))
			return false;

		final boolean success=proficiencyCheck(mob,0,auto);
		if(success)
		{
			final CMMsg msg=CMClass.getMsg(mob,target,this,verbalCastCode(mob,target,auto),auto?"":_("^S<S-NAME> incant(s) slowly.^?"));
			if(mob.location().okMessage(mob,msg))
			{
				mob.location().send(mob,msg);
				beneficialAffect(mob,target,asLevel,0);
			}
		}
		else
			beneficialWordsFizzle(mob,target,_("<S-NAME> attempt(s) to invoke a field of slowness, but fail(s)."));

		return success;
	}