文字忍受者

A chain of lesser Forge Worlds spanning sectors on the border of Segmentums Tempestus and Pacificus, including Incunabula, Urdesh, Valia-Maximal, Kalibrax, Graia, Arl'Yeth, Atar-Median, Arachnis, and Jerulas Station. At the start of the Horus Heresy in 010M31, roughly half declare for Horus and half for the Emperor. The reulting conflict is dubbed the Cataclysm of Iron.