Dungeon Delve is basically 30 mini-dungeons. Think a 2-5 page adventure with the stats and maps.While I know nothing about the product -- isn't Dungeon Delve (about to be released next month) supposed to be a massive dungeon that you could use for all levels as a giant dungeon with many levels, or in pieces as needed for your own plot?
(But I could be completely off )
I guess I'd be remiss if I didn't point out that my own Ptolus product is pretty much the setup you describe (city with a massive dungeon beneath it which hooks up to the underdark with dark elves, etc.). While it has a lot of material about that dungeon, however, it is mostly about the city above.
Here's another question, for those DMs that have run mega-dungeons: Did your players map it as they went? Or was that too time-consuming? And if they didn't map it, how did they get out? (Or didn't they?!)
Well I can say that I'd love to buy a copy of Ptolus, but darn it all, it's almost impossible to find!![]()
Any chance that there will be a reprinting at some point?
(Please accept my apologies if this has been asked/answered to death, my Googling has failed to retrieve the specific answer I seek...)
While I always seem to come back around to Rappan Athuk in curiosity (or maybe it is the name), I've been a bit off-put by it, reading comments like it is a "killer dungeon" in which entire party death is inevitable, sort of like how I remember feeling about Tomb of Horrors back in the day.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.