This is the map of the Upper Catacombs beneath the surface ruins of the monastery. It's not part of the "true" dungeon levels, but I really like it. Combined with the ruins themselves, the Lower Catacombs, and the Hermit Caves, there's plenty to do at Urheim before descending into the maw of Chaos itself. I'm really pleased by this set-up, since lots of lateral movement and meaningful choices about how best to proceed are an important part of designing a good megadungeon.
Thanks, as ever, to the talented Fr. David for his cartographic work.