The Lost Caverns of Tsojcanth

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The Lost Caverns of Tsojcanth is an adventure module for the Dungeons & Dragons fantasy role-playing game. It was written by Gary Gygax and published by TSR in 1982 for the first edition Advanced Dungeons & Dragons rules. The 64-page adventure bears the code "S4" and is set in the Greyhawk campaign setting. It is divided into two parts, a 32 page adventure, and a 32 page booklet of monsters and magic items. The plot involves the player characters investigating rumors of lost treasure. After traversing a wilderness and two levels of dungeons, the players face Drelzna, the vampiric daughter of long-deceased archmage Iggwilv.
The Lost Caverns of Tsojcanth was published in 1982 and is a revised and expanded version of The Lost Caverns of Tsojconth, a tournament adventure that Gygax wrote for 1976 WinterCon V gaming convention. Gygax expanded the tournament adventure by adding a wilderness area, with part of it based on earlier work by Rob Kuntz. Work on the adventure delayed the completion of The Temple of Elemental Evil, another Gygax adventure. The Lost Caverns of Tsojcanth was included in the 1987 supermodule Realms of Horror, and updated for v3.5 in an online edition in 2007.