While you won't find this on DriveThruRPG under an official banner, the "Caverns of Thracia 3.5 PDF" usually refers to high-quality fan conversions found on community sites like Dragonsfoot, ENWorld, or Reddit.
Why is a converted PDF so valuable?
The PDF provides treasure in gold and magic items, but 3.5 expects Wealth by Level. You may need to adjust the magic items. The original has a +5 Sword early on. In 3.5, that breaks the math. Downgrade it to a +1 Keen sword instead.
If you only have the OD&D version, here’s how to convert on the fly:
| OD&D / Basic | D&D 3.5 | |---------------|----------| | AC (descending) | 20 – listed AC = ascending AC | | Hit Dice | Keep HD; add CON mod for important monsters | | Saving throws | Use Fort/Ref/Will by monster type (e.g., humanoid: good Ref) | | Treasure XP | Ignore; use 3.5 CR-based XP | | Traps | Convert to Search DC ~20–25, Disable Device DC ~20–30 |
Example:
While you won't find this on DriveThruRPG under an official banner, the "Caverns of Thracia 3.5 PDF" usually refers to high-quality fan conversions found on community sites like Dragonsfoot, ENWorld, or Reddit.
Why is a converted PDF so valuable?
The PDF provides treasure in gold and magic items, but 3.5 expects Wealth by Level. You may need to adjust the magic items. The original has a +5 Sword early on. In 3.5, that breaks the math. Downgrade it to a +1 Keen sword instead.
If you only have the OD&D version, here’s how to convert on the fly:
| OD&D / Basic | D&D 3.5 | |---------------|----------| | AC (descending) | 20 – listed AC = ascending AC | | Hit Dice | Keep HD; add CON mod for important monsters | | Saving throws | Use Fort/Ref/Will by monster type (e.g., humanoid: good Ref) | | Treasure XP | Ignore; use 3.5 CR-based XP | | Traps | Convert to Search DC ~20–25, Disable Device DC ~20–30 |
Example: