In 1996, TSR released the module named “Undermountain: The Maddgoth's Castle” with the product code “TSR 9528.” It was the second adventure for the newly-conceived product line called The Dungeon Crawl Series. Written by Steven Schend, the module aimed to flip the script on the massive dungeons of Undermountain by shrinking the heroes down to fit the dollhouse-sized magical castle, presenting some unusual challenges. “Maddgoth's Castle” consisted of a 36 page adventure set in the lower depths of Undermountain.
This conversion guide allows DMs to run the original module with 5th Edition rules and provides a reference sheet for encounters.
To use this conversion guide, you will need a copy of "Undermountain: Maddgoth's Castle", originally available in hard copy and now for sale in digital format at DMsGuild.com.
"Classic Modules Today: B4 The Lost City" contains the OpenOffice/LibreOffice source files used to create the PDF. Visit Classicmodulestoday.com for instructions on creating your own classic module conversions and selling them on the DMs Guild.
What this Conversion Is, and What it Is Not:
This conversion is for the original module, as it was written. Classic Modules Today conversions are designed to convert the magic items, monsters, traps, and other key statistics from the original module into 5th edition. These guides set the adventure in the Forgotten Realms, and may offer some additional notes on running the adventure, or suggestions for extra encounters, but they are primarily conversions that are faithful to the original module.
Per guidelines from One Book Shelf and Wizards of the Coast, we are not permitted to revise or reinvent these adventures; we may only convert the above elements over to their corresponding 5th Edition counterparts.