So, I finished running the Secrets of Darkmoon Vale Campaign Arc (D0, D1, D1.5, and D4) for my wife and father-in-law, and the party has decided to track down the other Seals to make sure they're okay. I've decided that the first place they'll be going to look is Kraggodan. They'll be able to find some information leading to one of the seals there, after doing some dungeon-delving. I've used an online Random Dungeon Generator to generate a map or two, but am having trouble deciding what to put in it.
I know there isn't much published information about Kraggodan, why it "fell", and what's down there, so I'm looking for suggestions and advice. Ideally, I'd like to have some sort of "theme" to the encounters, possibly leading toward discovering just why Kraggodan fell in the first place.
Well, Kraggodan is still a viable dwarven settlement present day. It has multiple links to the Darklands below it, so that could be a theme in the bowels of the fortress-city. However, the seal is liable to be in a well-secured location in the central portion of the citadel where it would be heavily protected (both physically and magically) by descendants of the Shining Crusade.
I have plans for my PCs to make a visit to Kraggodan someday in my homebrew campaign, but I hadn't planned for it to be a dungeon delve so I can't help much there sorry. Good luck!