Not to be confused with the revamped 1982 module with the similar name of Lost Caverns of Tsojcanth, this is the original 1976 Winter Con V module that was used in a tournament context. As was typical of most adventures of this period, it consists of a couple of maps with descriptions of the contents of each room.

There is a description of a general plot involving Iggwilv, an archmage in the Greyhawk setting, but this is a module constructed for tournament play and that is part of what makes it interesting. The game’s dungeon is split into two levels and when a party finishes the first level only one of the player characters moves on to the next level. So, of the six pre-constructed characters only one, who the DM decided was the best player, based on criteria that this module explains, moves on to the next level, together with all the best players from the other groups that played the first level. 

By the time you reach second level you will have weeded out 30 players from 6 different groups of 6 players, and you finally have a second level where the best of the best gets to win the game. The setting is quite fun, with a variety of monsters and even a couple of metallic dragons, but the best part is the last room, bathed in the light of a magic lantern with rays that create different effects on the persons it shines on depending on the color of the glass in front of it, while a beautifully terrifying Vampire Princess sleeps under it. A fun little adventure that literally shines a light on early days of D&D.