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

		if(!super.invoke(mob,commands,givenTarget,auto,asLevel))
			return false;

		final boolean success=proficiencyCheck(mob,0,auto);
		if(success)
		{
			// it worked, so build a copy of this ability,
			// and add it to the affects list of the
			// affected MOB.  Then tell everyone else
			// what happened.
			final CMMsg msg=CMClass.getMsg(mob,target,this,verbalCastCode(mob,target,auto),auto?"":_("^S<S-NAME> chant(s) to <T-NAMESELF>.^?"));
			if(mob.location().okMessage(mob,msg))
			{
				mob.location().send(mob,msg);
				final Ability A=target.fetchEffect("Chant_StrikeBarren");
				if(A!=null)
				{
					if(A.invoker()==null)
						A.unInvoke();
					else
					if(A.invoker().phyStats().level()<adjustedLevel(mob,asLevel))
						A.unInvoke();
					else
					{
						mob.tell(_("The magical barrenness upon @x1 is too powerful.",target.name(mob)));
						return false;
					}
				}
				mob.location().show(target,null,CMMsg.MSG_OK_VISUAL,_("<S-NAME> seem(s) extremely fertile!"));
				beneficialAffect(mob,target,asLevel,Ability.TICKS_ALMOST_FOREVER);
			}
		}
		else
			return beneficialWordsFizzle(mob,target,_("<S-NAME> chant(s) to <T-NAMESELF>, but the magic fades."));


		// return whether it worked
		return success;
	}