Horus Heresy · atlas

Theme · 4 events

The Red Schism

Mars, the Titans, the Knights. A civil war of institutions, without which the walls have no supply: whoever holds the forges sets the tempo for both sides.

Events of the theme

  1. 005.M31 Schism of Mars · the “Death of Innocence” Traitor victory

    Fabricator General Kelbor-Hal, regarding the Emperor as a false Omnissiah, swore himself to Horus and unleashed the corruption of scrapcode on Mars, setting off the civil war of the Mechanicum (the…

  2. 006.M31 Battle of Magma City Pyrrhic loyalist victory

    Magma City became the focus of the loyalist resistance in the Schism of Mars: Legio Tempestus and the Knights of Taranis came to Koriel Zeth’s aid.

  3. 013.M31 Battle of Beta-Garmon · Titandeath Traitor victory

    At the Beta-Garmon cluster, the “gateway to Terra”, both sides assembled titanic forces. More than a thousand Titans fought on irradiated Beta-Garmon II — the greatest Titan battle in history.

  4. 015.M31 Liberation of Mars Loyalist victory

    After the lifting of the Siege of Terra the Imperium retook Mars from the Dark Mechanicum.

How to look in the atlas
  • “Legions” mode → the “Forces and powers” tab (not “Legiones Astartes”): the Mechanicum and the Titan Legions live there.
  • Time slider 5.4 (the Schism) → 6.005 (Magma City) → 13.2 (Beta-Garmon) → 15.1 (Liberation of Mars) — an arc longer than the Siege.
  • The “World statuses” layer + search “Mars”: the forge changes sides before the Legions reach Terra.
  • Glossary: “Dark Mechanicum”, “Legio Mortis”, “Legio Titanicus”, “Imperial Knights”.

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Open in the atlas

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Permalink: https://astart.es/en/themes/theme-mechanicum/