 The rulebook is based on the D20 rules system used by the third edition of "Dungeons and Dragons", also published by Wizards of the Coast, and follows a similar layout and format to the D&D core rulebooks.However, the term 'Dungeon Master' is not used (as this is reserved for D&D products only), being replaced by the more generic 'gamemaster' to refer to the player running the game.The game does not use different races, as in the novels there are only two sentient, naturally-evolved species, namely humans and Ogier (optional rules for playing an Ogier are provided).