The AT-43 rulebook introduces the universe and rules of AT-43. It is divided into two main parts.
The first part presents the history of Ava and the four armies at war forty three years after the Trauma, it also introduces factions for each army that will be developed in future dedicated publications.
The second part details all the game rules. There is a section dedicated to each of the game phases and all the important rules are gathered into thematic chapters – shooting, close combat, etc. This second part also contains six exclusive missions usable with any AT-43 army.
The appendixes contain a glossary of game terms, as well as gaming aids to help players use the rules in game. The appendixes also contain exclusive excerpts from the dedicated publications for the White Stars of the U.N.A. and for the Therian Project.