@Override
	public boolean invoke(MOB mob, Vector commands, Physical givenTarget, boolean auto, int asLevel)
	{
		if(!super.invoke(mob,commands,givenTarget,auto,asLevel))
			return false;

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

		if(success)
		{
			invoker=mob;
			final CMMsg msg=CMClass.getMsg(mob,null,this,verbalCastCode(mob,null,auto),auto?"":_("^S<S-NAME> open(s) the gates of the abyss, incanting angrily.^?"));
			if(mob.location().okMessage(mob,msg))
			{
				mob.location().send(mob,msg);
				final MOB otherMonster=mob.location().fetchInhabitant("the great demonbeast$");
				final MOB myMonster = determineMonster(mob, mob.phyStats().level()+(getXLEVELLevel(mob)+(2*getX1Level(mob))));
				if(otherMonster!=null)
				{
					myMonster.location().showOthers(myMonster,mob,CMMsg.MSG_OK_ACTION,_("^F^<FIGHT^><S-NAME> wrests itself from out of <T-YOUPOSS> control!^</FIGHT^>^?"));
					myMonster.setVictim(otherMonster);
				}
				else
				if(CMLib.dice().rollPercentage()<10)
				{
					myMonster.location().showOthers(myMonster,mob,CMMsg.MSG_OK_ACTION,_("^F^<FIGHT^><S-NAME> wrests itself from out of <T-YOUPOSS> control!^</FIGHT^>^?"));
					myMonster.setVictim(mob);
				}
				else
				{
					myMonster.setVictim(mob.getVictim());
					CMLib.commands().postFollow(myMonster,mob,true);
					if(myMonster.amFollowing()!=mob)
						mob.tell(_("@x1 seems unwilling to follow you.",myMonster.name()));
				}
				invoker=mob;
				beneficialAffect(mob,myMonster,asLevel,0);
			}
		}
		else
			return beneficialWordsFizzle(mob,null,_("<S-NAME> attempt(s) to open the gates of the abyss, but fail(s)."));

		// return whether it worked
		return success;
	}