From the introduction:
This module was inspired by the re-release of the Moldvay Basic Edition of the world’s most famous FRPG and is the culmination of a project to imagine what that Basic Edition would look like had the monster section only included creatures found in my favorite folio of fiends (often referred to as the FF). Since the boxed set of the Moldvay Basic Edition came with the second installment of the B-series of adventure modules, it follows that I should re-image that introductory module as if it would have appeared in the FF version of the Moldvay Basic Edition.
This adventure is written for the retro-clone Labyrinth Lord™, an excellent emulation of the Moldvay Basic Edition. Therefore, this adventure is not only compatible with that edition, but requires almost no conversion to use with any of the older editions of the world’s most famous FRPG.
This scenario is available as a free download. (see links section below)
This module is the designer's personal variation on the caves of Chaos:
One of my most popular series of posts was an intellectual exercise to see how Moldvay’s Basic Edition would look like if the monster section only had creatures from the Fiend Folio. Although I did end up making Wandering Monster Tables and I did stock a dungeon using them, I never took the whole exercise to the next level: producing a version of the Caves of Chaos that would have come with that Fiend Folio’d version of Moldvay’s Basic Edition.
Given the popularity of both B2 and Moldvay’s wonderful little red book, I decided to take on the task. I can’t speak for other folks who write adventures, but there are those that fight you every inch of the way (my continuing struggles with my version of The Chateau des Faussesflammes immediately comes to mind) and those that seem to write themselves. When I started thinking about re-imaging the Caves of Chaos infested with Fiends from my favorite Folio, the adventure definitely fell into the latter category. (attrib: Blood of Prokopius:Gamer ADD: Fiend Folio + The Caves of Chaos)