My idea on the layout of The Crater.

I figured that it's been so long since we never really had an clear view of the inside of the Crater (with the exception of the live action short film promo, in which the exterior doesn't even match in the game).  So, I decided to put down what I see as the layout of the interior of The Crater, being inspired by the few accounts of Dungeons & Dragons players and Dungeonmasters who created their own layouts and campaigns for table gameplay.