And it's a "what now" moment for the party - having just finished a big quest, they're finding that events are moving rather quickly, and a war is brewing between humans and Faerie. After sending a "telegram" to warn a kind-of-ally on the borderlands (magpie + speak with & befriend animals + Magic Mouth), what next?
Well, our heroes have some idea they should stop the war, but how? Call it an intriguebox or what you will, but the railway station is far from evident at this point. There were some cautious attempts at intelligence gathering, but still, the realization was heavy that, well, one does not just walk into the Archimandrite's audience room with an audacious plan.
|Get out now, while you can!|
See, in a dungeon, you are confined and channeled ... but so are the monsters. You take things, generally speaking, one thing at a time. In a wilderness, the enemies are all around, but few and far between. But if you seek adventure in a city, there's a web of interconnections and interests all around you. Pull the wrong string, and the city guard, the lynch mob, the thieves' and wizards' and vampires' guilds are all on your tail. Not to mention the guilt of all that collateral damage to innocent citizens as your fireballs and lightning bolts vaporize your foes.
And the dungeon is nice and easy to find your way through. One door, two doors, three doors, dead end. It's even laid out in nice 10 foot squares for your mapping convenience. The city, though ... how do you sift out the adventure location from the rag-picker's house or the vacant lot? How do you follow a trail through tens of thousands of people?
Finally, once you're done with the dungeon, you're done and you move on. But with a city, you want it to stick around for you, with all its possibilities, commerical opportunities, and allies. Wrecking a dungeon is much less consequential than wrecking a city, or otherwise turning it against you.
Hell, get me out of this city, with its taxes and tithes, its envious eyes, its rats and 8% chance of diseases, its teeming masses all looking for a chance to overbear you and roll your corpse for its suspiciously weighty cache of gold pieces and magic items! Put me in a nice, safe, predictable dungeon - that's where I know I can be the adventurer I want to be.