Infernal Battlefield of Acheron

Publisher's blurb: The secrets of the Infernal Battlefield of Acheron ... won at last! The mythical Codex of the Infinite Planes is a massive book containing information on the very planes of existence. Too many for one document to tackle, so it's been divided up into volumes covering individual planes. Crack open the codex in this continuing volume and learn about the Infernal Battlefield of Acheron, a plane of great metal cubes clanging together and massive armies moving against one another in open warfare!