I just had a great campaign idea. A BBEG sets up a bunch of small dungeons with "keys" that when put together will access his main base for the party to break into.
The twist is these "keys" have clues that just lead to other "keys" and dungeons. The BBEG doesn't have a lair but is trying to rid the empire/continent of their best heroes so it's easier to take over.
There can be clues for the party like groups of dead adventurers in the dungeon or an easy one like a "key" just leads back to the start of the dungeon loop again.
I got this idea after seeing a lemmy post about ant death circles.
nice, infinite dungeons. how will you deal with information about where the bbeg is located? wont the players want to know where the layer is to prepare or try a breakin without all keys? or is he just sitting around in a hidden hut until everyone is dead?
This was just part of an idea I thought I'd post since it sounded fun. I replied to the other commenter with similar questions but I'm not currently DMing otherwise I would figure that out.