The zgg blackmoor dungeon book is a really interesting document because it gives great insight into what Dave thought about his dungeon over the years. But, the history given in it seems a little hokey with half a dozen races building it, including dgragons and giants. Wheras if you read the descriptions of the first few levels it's clear arneson thought of those as typical human constructions. So for lower levels to be older and non human in Origen there must have been other cave entrances. So I would simplify the history to something like levels 10-20 were constructed from sea caves up into the rock and into existing caverns with one or two cliff face entrances big enough for a dragon. At some point a band of dragons come along and drive out the sar aigu. They are killed by Rob I and the castle is built and caves sealed. Various barons add deeper and deeper levevls until the lower levels are rediscovered. what do you think?

I think the question of a concise dungeon structure stands or falls with THE REASON BM dungeon was built in the first place.

That reason is never given, and I honestly doubt Mr Arneson had an idea about it when he started the game. :wink: