What are the rules when it comes to Duergars owning property on the surface? Does it differ homes vs shops?
In particular, I wanted to better understand the stance for non-settlements like Crow's Nest, Sibayad and the Arcane Tower?
I think there are 4 categories to consider:
[1] Settlements excl Guldorand - almost certainly no?
[2] Guldorand - probably yes, as there's a Duergar NPC with a shop?
[3] Non-settlements (Crow's Nest, Sibayad, Arcane Tower) - probably yes?
[4] Wilderness - yes, as even allowed by monsters?