Heh. It is an updating and improvisational take on the uppermost levels of the original Undermountain. If it was a Hollywood movie, it would say "inspired by" …and I don't mind in the slightest. A lot of what's in the new book is FUN. It provides a different take on what I…
— Ed Greenwood (@TheEdVerse) December 2, 2018
And yes, Undermountain was my original dungeon. With immediate offshoots like the Dungeon of the Crypt, Skullport, and the Citadel of the Black (later Bloody) Hand.
— Ed Greenwood (@TheEdVerse) December 2, 2018