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Classic Modules Today: B4 The Lost City

Classic Modules Today: B4 The Lost City

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In 1982, TSR published the module named "The Lost City" with the module code "B4". It was written by Tom Moldvay and illustrated by Jim Holloway. This 32-page booklet had an outer folder containing maps. In addition to an extensive dungeon complex, the module provided guidance on expanding and creating additional levels and encounters for the adventure. In 2004, for the 30th anniversary of the Dungeons & Dragons game, Dungeon magazine ranked this module the 28th greatest adventure of all time.

This "B4 The Lost City" conversion guide allows DMs to run the original module with 5th Edition rules. Also included in this guide is a handy two-page reference sheet for encounters and factions along with monster and magic item conversions, all on one two-sided sheet.

To use this conversion guide you will need a copy of "B4 The Lost City", originally available in hard-copy and now for sale in Digital format at

This product also contains the OpenOffice/LibreOffice source files used to create the PDF. Visit for instructions on creating your own classic module conversions and selling them on the DMs Guild.

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Reviews (3)
Discussions (7)
Customer avatar
Stan S December 20, 2016 10:27 pm UTC
Good point. I'll review those rules and consider an update.
Customer avatar
Terrance G December 21, 2016 10:56 pm UTC
I have some additional suggestions and can send them to you, if you like. May not happen until after the holidays though.
Customer avatar
Stan S December 24, 2016 7:37 pm UTC
Love to hear them! If easier, you can email me directly at :-)
Customer avatar
Carl J December 13, 2016 3:22 pm UTC
Wouldn't it make sense to use the rules for Green Slime and Yellow Mold on DMG 105 instead of treating them as Gray Ooze and Violet Fungus?
Customer avatar
Stan S November 06, 2016 8:49 pm UTC
Hi Terrance! Thanks for the catch. We've updated the document to include conversion for the Baboon stats.
Customer avatar
Terrance G October 31, 2016 11:09 am UTC
I also wish you would have included the map numbers on the trap listings, like they did in the original. For example, you list the Crossbow Trap (p. 5), however the original has 5 different trap situations described. As a DM, I'm already shuffling back and forth during play, without having to read the entire page to figure out which one is the Crossbow Trap. In the original it is 1a, which corresponds to the map placement.
Customer avatar
Terrance G October 31, 2016 10:55 am UTC
I cannot find the stats for the Rock Baboon (Wandering Monster: Tiers 3 & 4) [listed on pg 4 and 8 in your guide]
Customer avatar
September 12, 2016 8:27 pm UTC
I am so happy to see these original modules converted!!! I never played Dragonlance any chance this might be on your to do list?
Customer avatar
Jeffrey K January 24, 2016 11:47 pm UTC
Why does the title on this page say "The Lost Temple" when it's "The Lost City"?
Customer avatar
Stan S January 26, 2016 3:11 pm UTC
Ah, good catch! Typo. I submitted the change; should show up soon.
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File Last Updated:
November 06, 2016
This title was added to our catalog on January 23, 2016.