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In 010M31, Forge Worlds in the Belt of Iron, spanning sectors on the borders of Segmentums Tempestus and Pacificus, declare either for or against Horus. The Forge Worlds of Incunabula, Urdesh, Valia-Maximal, and Kalibrax declare for Horus and the Fabricator General. The forges of Graia, Arl'Yeth, and Atar-Median declare for the Emperor. Arachnis and Jerulas Station fall into civil war on the matter. Many surrounding worlds become battlegrounds for this conflict.