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Thunderdelve Mountain is a solo scenario for a midlevel dwarf player character, and involves a mission to defeat a red dragon in its own lair. The module includes new monsters, and instructions for running the scenario as an adventure for a group.
XS2 Thunderdelve Mountain was written by William Carlson, with a cover by Larry Elmore, and was published by TSR in 1985 as a 40-page booklet with an outer folder.