All the dungeon options, full explanation of what the different ban options mean, warnings on how to not get bitten by IR's, holding court, and the traditional role of Judges monitoring the underground.
First of all, you need honour and prestige as you'll be losing them on a regular basis during war time. Ban/execute any infiltrators that are caught in your realm, and your honour/prestige will drop like a tank if there are many of them. Thus, combat may be necessary, or plenty of courtier work.