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Greyhawk
Greyhawk was the brainchild of AD&D creator Gary Gygax and his core group. Names such as Bigby, Mordenkainen, and Tenser -- which populate the spell lists -- hail from the Greyhawk campaign world. Well-detailed from publications and the pages of Dragon magazine, Greyhawk was virtually ignored for a time after the contentious departure of Gygax from TSR. Later, the venerable campaign world was taken up again by new writers, changing Greyhawk into something probably unrecognizable to its original developers.