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Once again according to D&D classics site; "Though "Tharizdun" was labeled as WG4, there were no previous "WG" adventures (and never would be). In the Glossography for the World of Greyhawk boxed set (1983), TSR indicated that T1: "The Village of Hommlet" (1979) was meant to be WG1 and that S4: "The Lost Caverns of Tsojcanth" was meant to be WG3. Meanwhile, in Dragon #71 (March 1983), Gygax revealed that the adventure formerly known as T2: "The Temple of Elemental Evil" was to be WG2 - but he now said it was to be published in two parts.
The over all look and feel of WG4 is completely Weird Tales. From the cover art and interiors all the way to the essence of the adventure. There's a uniformity of Lovecraftian horror about The Forgotten Temple. According to D&D Classics there are several key reasons for this;"Temple of Tharizdun" was reportedly produced very quickly by Gygax himself, rather than the company's design department. Much of the work was done by Gygax's new Greyhawk cadre. Thus Eric Shook drew the maps, while Shook's mother, Karen Nelson, drew the evocative artwork. Gygax later said that he choose Nelson's artwork to highlight the "melodrama and pathos" of the adventure. An adventure being done by someone other than the design department was very unusual by 1982, as was having a single artist illustrate an adventure - that is, rather than the usual teamwork illustration done by TSR's art department"
Gary Gygax borrowed the god Tharizdun from Kuntz's Kalibruhn campaign and you can get more of the back history on that here This is one of the modules that I've DMed and played since the Seventies and it was a gift from a family friend whose now long gone. Because of this module's connections with the Southern Yatil Mountains its been a fairly easy fit to customize the entire module to other campaign settings one of the reasons for this was;" It is a combined wilderness and dungeon adventure set in the Southern Yatil Mountains, focused on a temple dedicated to the evil and insane Greyhawk god Tharizdun" Because of this WG4 The Forgotten Temple of Tharizdun can easily be used within the confines of AS&SH with a bit of work, this module could be used as a part of the centerpieces of the Spiral Mountains. Gods exist in multiple planar locations enabling a DM to port them into a wide variety of old school campaign setting set pieces. In fact I've connected Ksarul, Ancient Lord of Secrets, Doomed Prince of the Blue Room, Master of Magic and Grammarie from Empire Of The Petal Throne to Tharizdun













































