This expansion to the The Duke core game, adds the atmosphere of the Arthurian mythology, while still maintaining the the major goal of the game, which is to capture the opponent's Duke tile. However, with this expansion the actual Duke tiles are replaced by the opposing characters of Arthur and Mordred. It introduces seven mythical figures taken from the Arthurian legends and stories, as well as a new terrain tile.

This expansion does make some modifications to the starting tile set, including the creation of asymmetrical opposing forces. It also provides one alternate playing scenario for the game using the expansion tiles.

The rulebook for this expansion provides one alternate playing scenario to incorporate these tiles and the Camelot tile into the game. This alternate playing scenario gives the player special advantages whenever their Arthurian tiles are moved into or out of Camelot while its on the board.