@Override
	public boolean invoke(MOB mob, List<String> 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)
		{
			int much=mob.phyStats().level();
			final CMMsg msg=CMClass.getMsg(mob,target,this,CMMsg.MSK_MALICIOUS_MOVE|CMMsg.TYP_UNDEAD|(auto?CMMsg.MASK_ALWAYS:0),auto?"":L("^S<S-NAME> clutch(es) <T-NAMESELF>, and drain(s) <T-HIS-HER> life!^?"));
			if(mob.location().okMessage(mob,msg))
			{
				mob.location().send(mob,msg);
				mob.curState().adjMana(-much,mob.maxState());
				if(msg.value()>0)
					much = (int)Math.round(CMath.div(much,2.0));
				CMLib.combat().postDamage(mob,target,this,much,CMMsg.MASK_ALWAYS|CMMsg.TYP_UNDEAD,Weapon.TYPE_GASSING,L("The drain <DAMAGE> <T-NAME>!"));
			}
		}
		else
			maliciousFizzle(mob,target,L("<S-NAME> attempt(s) to drain life from <T-NAMESELF>, but fail(s)."));

		// return whether it worked
		return success;
	}