It begins with an exploration of the historical period between 1450 and 1950, then provides rules for creating characters and campaigns that blend realism and fantasy.

[2] The book itself is divided into an introduction and five chapters: Further period background information was made available as a Web Enhancement.

Skills and feats have deviated remarkably from their d20 Modern standards to accommodate for the differences in technology.

For example, certain uses of a skill that were acceptable under a modern standard may no longer apply to a campaign setting where the technologies to perform these actions may not have been available.

Similarly, some feats may represent modern knowledge or techniques that were not available to people centuries prior.