Realms of Horror is a large scale adventure module for Advanced Dungeons & Dragons RPG. It revises four previously published modules: Tomb Of Horrors, White Plume Mountain, Expedition To The Barrier Peaks, and The Lost Caverns Of Tsojcanth. The adventure is designed for Intermediate level characters, and the revisions are to make it easier for "a gung-ho, let's-do-it-all-at-once campaign".
The pack contains an 80pg booklet, a 48pg illustration booklet (handled by a variety of artists and styles), and a 16 page booklet of maps and inscriptions, all in B&W, wrapped in a colour cover slip. The modules present detailed and complex dungeons to explore, using all the classic elemnts of AD&D. The third module was originally written for an unpublished Sci-Fi RPG and presents the PCs with robots and computers.