The classical Hack series is designed to be specific to particular periods in time. In this instance Hack in the dark focuses on the period 250 A.D. to 1000 A.D. This period began with the beginning of the fall of Rome and ends at the turn of the new millennium. The period begins in a time of darkness but ended in the creation of the brilliant era of the Middle Ages.
The game system is easy to understand in which you can recreate history in miniature, The book includes the rules, illustrations and army lists by people and periods.