DLE3 Dragon Keep was written by Rick Swan, with a cover by Jack Pennington, and was published by TSR in 1990 as a 64-page booklet with a large color map and an outer folder.
Reception
In the February–March 1990 edition of Games International, Dave Hughes noted that this module was "one of those rarities: a module that is part of a series yet can be played as a stand alone adventure." Noting the high quality and amount of information provided, Hughes concluded by giving it an excellent rating of 9 out of 10, saying, "In addition to being a different and exceptional module, Dragon Keep is exceptional value for money."