You can see Thulla's escape route on the second level of the Grymforge she jumps into the lake and swims back. Thulla is wearing Thrinn's missing boots, she was taken along with the others before Thrinn sent Gekh to retrieve her. As for how long the gnomes have been digging there, who can say, we do see a pretty sizable pile of corpses, if you want to be morbid, we might be able to judge it by guessing how many gnomes Nere and Thrinn go through in a day.
To be clear, I see no evidence that the gnomes discovered the Grymforge, unless it was a smaller party lead by Wulbren who was looking for the secret of runepowder.
I don't think you want to get too hung up on which and how many entrances to the Underdark there are, also, lining up the maps shouldn't make much sense considering how much distance there is actually travelling downwards, the Underdark is pretty far down isn't it?
You giving the "literal" definition is maybe the problem, we don't always use words in their literal sense, nor is it wrong to call a run down shack decrepit regardless of age. This particular point is becoming a little febrile.
Last edited by Sozz; 03/12/21 07:17 AM.
