@Override
	public boolean invoke(MOB mob, List<String> commands, Physical givenTarget, boolean auto, int asLevel)
	{
		MOB target=mob;
		if((auto)&&(givenTarget!=null)&&(givenTarget instanceof MOB))
			target=(MOB)givenTarget;

		if(target.fetchEffect(this.ID())!=null)
		{
			mob.tell(target,null,null,L("<S-YOUPOSS> skin is already hard."));
			return false;
		}

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

		boolean success=proficiencyCheck(mob,0,auto);

		if(success)
		{
			invoker=mob;
			final CMMsg msg=CMClass.getMsg(mob,target,this,verbalCastCode(mob,target,auto),auto?L("<T-YOUPOSS> skin hardens!"):L("^S<S-NAME> chant(s) to <T-NAMESELF> and <T-HIS-HER> skin hardens!^?"));
			if(mob.location().okMessage(mob,msg))
			{
				mob.location().send(mob,msg);
				success=beneficialAffect(mob,target,asLevel,0)!=null;
				target.location().recoverRoomStats();
			}
		}
		else
			return beneficialWordsFizzle(mob,target,L("<S-NAME> chant(s) to <T-NAMESELF>, but nothing happens"));

		// return whether it worked
		return success;
	}