From the introduction:
The Free Kingdom of Drakenfjord [is] a live-action role-playing (LARP) group based in Livingston, Texas. Drakenfjord is affiliated with the High Fantasy Society (HFS), a nationwide LARP organization.
This book deals only with the rules of combat, which comprises roughly one quarter of the game.
Remember: Every persona must be either from an ancient, medieval, or swords-and-sorcery related background.