A sequel was released in 1999, "Return to the Keep on the Borderlands" for 2nd edition "AD&D". The original B2 publication was generic in terms of setting, while the 1999 "Return" module placed the Keep in Yeomanry, making it a canonical location in the "World of Greyhawk". The placement of the Keep in Greyhawk did not match many details in the sequel, such as several non-Greyhawk deities, nations, and peoples. At least two of the non-player character descriptions refer to details from the Mystara setting rather than Greyhawk.