✅ : Look for the d20 version by Necromancer Games (published 2005-ish). It is fully 3.5-compatible and the closest you’ll get to an official PDF.
For those looking for a digital copy, the history is somewhat fragmented: caverns of thracia 3.5 pdf
This adventure is designed for a party of 1st-level characters and is intended to take them on a thrilling journey through the caverns, navigating treacherous terrain, avoiding deadly traps, and battling formidable foes. ✅ : Look for the d20 version by
If you only have the OD&D version, here’s how to convert on the fly: navigating treacherous terrain