While Keep on the Shadowfell was designed initially for the "points of light" core setting for 4th edition D&D, alterations to the adventure made in an article of Dungeon magazine made it possible to use it as a dungeon for characters in the Forgotten Realms. These changes included changing the focus on Orcus to that of Shar and relocating Winterhaven to a geographical location in Faerûn between Cormyr and Sembia. In April 2009, the adventure was released online at Wizards of the Coast's official website for download.