Northern Crown is a d20 System role-playing game of alternate history and fantasy, set in a magical version of seventeenth-century North America.

While only the New World Adventures hardcover is actually required for play in the setting, the additional rules and information presented in the Gazetteer allow for expedited preparation, particularly in regards to inventions and other technology.

As with Africa in the real world, Uropan slavers favor Nyambe, and the several nations in Northern Crown which still use slavery as a source of labor ensure that this practice remains profitable.

Referred to as the Far East Asia is not mentioned by name, although Cathay (China), Xipangu (Japan), and the Moghul Empire and subcontinent of Indi (India) are briefly discussed.

Unlike the core Dungeons & Dragons game, which offers the player a choice of one of several different races, it is assumed that all characters in Northern Crown are- for the most part -human.