The nine loyalist Space Marine Legions who survived the Horus Heresy went on to become the First Founding Chapters – each with their own unique heroes, histories, home worlds, and heraldry. First Founding is a lavish 304-page coffee table book full of expansive art and detailed background information that explores these Chapters in depth, written by Guy Haley, John French, Nick Kyme, David Guymer, and Callum Davis.