Five Nations offers players a rich source of information about playing and dealing with characters from the Five Nations of the Eberron world. As any play in the Eberron world is likely to involve the Five Nations or characters from them, the book is useful to anyone involved in an Eberron campaign. The individual nation chapters include information on culture, geography (including maps), guilds and factions and, new prestige classes, equipment, creatures, spells, magic items, and adventure sites.