The second module ever written for Dungeons & Dragons was a 1976 game convention tournament adventure written by Gary Gygax: The Lost Caverns of Tsojconth. In 1982, TsojcOnth would be heavily re-worked and released as the classic module S4: TsojcAnth. Why did the spelling change? I have no idea. What was the first D&D module?…
Source: D&D Ultra-rare: Lost Caverns of Tsojconth (1976) – The Original Edition of AD&D Module S4
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