The Forgotten Temple of Tharizdun (WG4), Greyhawk adventure for AD&D 1st edition, by Gary Gygax
“An Adventure set on Greyhawks’s world for Character Levels 5-10.
This special module is a combined wilderness and dungeon adventure scenario. It contains background information, referee’s notes, encounter keys, outdoor and dungeon level maps, and new monsters and treasures. While it is designed to interface with THE LOST CAVERNS OF TSOJCANTH, this module is capable of standing alone. Likewise, while it is placed within the Greyhawk Campaign, it can easily be adapted to play in any individual campaign which employs the ADVANCED DUNGEONS & DRAGONS game system.”