Full rules and lore for the original version of the "Space Dwarves" before they were largely removed from later editions (and eventually returned as the Leagues of Votann). Finding a Warhammer 40k Codex Imperialis PDF
There are two primary ways the term "Codex Imperialis" is used in the Warhammer 40k universe: warhammer 40k codex imperialis pdf
In recent 10th Edition lore, the Primarch Roboute Guilliman is currently writing a "Codex Imperialis". Unlike the Codex Astartes (which focused on military tactics), this new document focuses on civilian matters, political reorganization, and providing an accurate, propaganda-free history of the Imperium. Content of the Classic 2nd Edition Codex Full rules and lore for the original version