So he have perfected combat technology. We have built impenetrable armour. We have chainsaws. But for what? Killing pigs? Even the new strongholds would fall before the nanosaber.
I'm proposing some kind of industrial dungeon, whether it be a very hostile new dimension/planet (only accessible through high tech), or some kind of giant building filled with traps, robots, deathrays, uninsulated hv cables ( is saw a thread for factories a while back...). We need some challenge for our quantum suit.