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Classic Modules Today: S4 The Lost Caverns of Tsojcanth (5e)
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Classic Modules Today: S4 The Lost Caverns of Tsojcanth (5e)


In 1982, TSR published the module named “The Lost Caverns of Tsojcanth” with the module code “S4”. It was written by Gary Gygax, and illustrated by Jim Holloway, Erol Otus, Jeff Easley, and Stephen D. Sullivan. It consisted of two 32 page booklets. The first dealt with the wilderness trek to find the caverns, as well as the caverns themselves. The second detailed new monsters and magical items not previously published. In 2004, for the 30th anniversary of the Dungeons & Dragons game, Dungeon magazine ranked this module the 22nd greatest adventure of all time.

This conversion guide allows DMs to run the original module with 5th Edition rules and provides a reference sheet for encounters. It is intended for 5-6 characters of levels 7-10.

To use this conversion guide you will need an original copy of S4: The Lost Caverns of Tsojcanth.

"Classic Modules Today: B4 The Lost City" contains the OpenOffice/LibreOffice source files used to create this PDF. Visit for instructions on creating your own classic module conversions and selling them on the DMs Guild.

Classic Modules Today are a series of products that convert early edition Dungeons & Dragons and Advanced Dungeons & Dragons adventure modules to the Dungeons & Dragons 5th edition rule set. They fully adhere to the rules set forth in the Community Content Agreement of the DMsGuild. The CCA states that adventure conversions must be:

"A streamlined, bare-bones conversion guide for someone who already owns the classic adventure — i.e., encounter-by-encounter conversion notes with any 5E stats needed, leaving out all other content."

For more information, download the free guide "Using Classic Modules Today Conversions".

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Reviews (2)
Discussions (6)
Customer avatar
Mark S June 10, 2018 4:06 am UTC
Stat blocks for the Dracolisk and Mobat have been added to the conversion. At some point I made them, then forgot to add them in. Mea culpa! Thanks to everyone who let me know about issues so I could correct them for you!
Customer avatar
Nod H June 10, 2018 5:19 am UTC
Don't forget to update the Monsters list on page 6.
(Mobat points to Harpy, Dracolisk points to Young Black Dragon)
Customer avatar
Mark S June 11, 2018 12:54 am UTC
I'll make the corrections and update the conversion tonight. Thanks!
Customer avatar
Terrelle S May 18, 2018 8:12 am UTC
Hey Mark, I missed it last time, but i just checked out the latest update, and found that for Drelnza, there are only two legendary actions listed for her, when she should have 3.
Which (probably) is missing a XXX (costs 2 Actions) ??

Thanks for your hard work, i do like the changes you made in the update.
Customer avatar
Mark S June 07, 2018 8:01 pm UTC
The missing third Legendary Action is supposed to be the standard vampire fang attack. I added it in and updated. Thanks for catching that and for the kind words!
Customer avatar
Daniel P March 20, 2018 2:49 am UTC
If you want maps for this, check out my webpage here at (copy/paste link):

Customer avatar
Terrelle S October 09, 2017 5:19 pm UTC
Magic Item i found missing from the 5e update guide:
Wilderness Encounters - Wyvern Roost
1) Elven Chainmail - It probably needs to be updated to "Elven Chain" from pg.168 from DMG
Customer avatar
Mark S October 11, 2017 4:38 pm UTC
Thanks for catching that Terrelle! I'll update the guide to fix it.
Customer avatar
Mark S October 12, 2017 4:42 am UTC
Customer avatar
Nod H January 04, 2017 10:39 pm UTC
The conversion is handy but is missing some sections from the original module.The lettered encounter areas from pages 9-12 are not represented at all in the conversion guide that I could find.
Customer avatar
Mark S January 05, 2017 4:41 am UTC
Thanks Nod H. This was my first conversion and I missed some things. I'll get up updated copy uploaded soon!
Customer avatar
Mark S January 05, 2017 5:34 am UTC
The missing encounter areas have been added, and a new version uploaded.
Customer avatar
Peter B November 27, 2016 6:55 am UTC
The conversion appears to be missing the xeg-yi and xag-ya (from the end boss room). Would it be possible to update the conversion with these? It would be much appreciated, as I'm going to be doing this module soon with my group. Otherwise, fantastic conversion!
Customer avatar
Mark S December 04, 2016 4:51 am UTC
Thanks Peter! Just uploaded an updated conversion with the missing creatures.
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File Last Updated:
June 11, 2018
This title was added to our catalog on April 07, 2016.