Hail Caesar continues in the same vein as Black powder, tweaking the rules set and providing the stats and abilities you  will need to fight battles in the ancient era. (1500BC to 1500AD or thereabouts).

The book itself is excellent. Its hard-cover, full color, and filled with pictures and diagrams. The writing is excellent, and is filled with the same dry wit that set Black Powder apart from its peers. Of particular note are the historical anecdotes that are scattered throughout the book that feature excerpts from famous historical texts and colorful commentary.

Rules wise, the game is very similar to Black Powder, and, in many ways, reads like a more in-depth and detailed version of the Kings of War rules. Units are described in fairly general terms (as should be expected from a game that plans on encompassing dozens, if not hundreds of different armies, and 3000 years of military development) and the number of models in each unit is fairly flexible. Hail Caesar is written to give each group of players a great deal of leeway in what models they collect and exactly how they choose to assemble them into an army.