The Wizards Three
The Wizards Three were a trio of wizards (usually Mordenkainen, Elminster of Toril and Dalamar of Krynn) who met on a mostly harmless alternate Oerth known as Earth in the dining room of author Ed Greenwood. There, they feasted themselves (at Greenwood's expense) and swapped magical lore, which Greenwood would secretly record and use as fodder for articles in the magazine Dragon, after translating the spells into game terms.
Publishing History
The Wizards Three first appeared in Dragon 188, December 1992, and appeared sporadically throughout the later publishing history of the magazine. In later installments, Dalamar was replaced with a young apprentice of Mordenkainen's, Rautheene. Greenwood would conclude the series by bringing back Dalamar for a final installment in Dragon 350, the final print issue of the magazine.