: This version was based on a 2002 Gen Con tournament adventure titled "Return to the Caverns of Thracia," run by Clark Peterson. PDF Availability
The original had vague "Find secret door on 1-2 in d6." The 3.5 PDF converts these to specific Spot or Search DCs (e.g., DC 20 to notice the loose stone). It also adds Use Rope and Climb checks for the infamous "Chasm of the Mists." caverns of thracia 3.5 pdf