World of Greyhawk

The World of Greyhawk folio edition (1980)

In 1975, Gygax and Kuntz published a booklet called Supplement I: Greyhawk, an expansion of the rules for Dungeons & Dragons based on their play experiences in the Greyhawk campaign. Although it detailed new spells and character classes that had been developed in the dungeons of Greyhawk, it did not contain any details of their Greyhawk campaign world. The only two references to Greyhawk were an illustration of a large stone head in a dungeon corridor titled The Great Stone Face, Enigma of Greyhawk and mention of a fountain on the second level of the dungeons that continuously issued an endless number of snakes.