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A few questions:
** spoiler omitted **
2. I would say groups continue trying to mine and treasure hunt the deeper parts of the mountain until the cave-in. Then maybe much less so. Before then, they likely affect makeshift repairs to the door and increase guards.
3. I need to look at this most recent conversion. I did not convert this one. I wrote the 3.5 Roots, and led the 4e conversion. My answer here, until I get home, is maybe.
4. Yes. And some outside before the weather forced them in. The ventshaft furnaces keep the place tolerantly warm, so fuel is only needed to cook food which requires preparation or for light.
5. The Great Stair is not on the map. It's beyond the door the derro bust through. We did not map it on purpose, so that it could be whatever you need it be. The idea was that the complex was too large, too convoluted to map it all, and so we stuck to the areas that needed it. The Great Stair is discussed a bit at the beginning of Roots.
I think that covers things. I will check on the descriptions when I get home.
-Ben.
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-Ben.