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

		if(target.fetchEffect(this.ID())!=null)
		{
			mob.tell(_("@x1 is already unbreakable.",target.name(mob)));
			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?_("<T-NAME> appear(s) unbreakable!"):_("^S<S-NAME> chant(s) to <T-NAMESELF>.^?"));
			if(mob.location().okMessage(mob,msg))
			{
				mob.location().send(mob,msg);
				if(!target.subjectToWearAndTear())
					maintainCondition=-1;
				else
					maintainCondition=target.usesRemaining();

				beneficialAffect(mob,target,asLevel,0);
				mob.location().show(mob,target,CMMsg.MSG_OK_VISUAL,_("<T-NAME> is unbreakable!"));
				target.recoverPhyStats();
				mob.recoverPhyStats();
			}
		}
		else
			return beneficialWordsFizzle(mob,target,_("<S-NAME> chant(s) to <T-NAMESELF>, but nothing happens."));
		// return whether it worked
		return success;
	}