Running a pre-written megadungeon is a challenging undertaking. Combing through a setting built by another person that spans kingdoms and continents is in many ways easier. There are large swathes of terrain left undetailed in the latter. You can write up and plop in just about anything your devious mind can imagine, as the writers of campaign settings make sure to leave plenty of space in the margins for just such a thing. In a megadungeon, it's very different. It has all the elements of a normal dungeon, sure. Rooms, corridors, encounters, NPCs. But in a normal dungeon, you're in and out in a few sessions. Then the space is left behind to molder and rot until you need it again, if you ever do. With a megadungeon, you're there for quite a long time. The goal is to have the dungeon be the campaign. So you sort of have to choose the right dungeon and then prepare to live and breathe that space. I've been running Stonehell for only thr...