Horus Heresy · atlas

010.M31 · The Road to Terra · date approximate

Defence of Ryza

Place: Ryza · Segmentum Tempestus

Fig. 1 · Place on the map

Loyalist victory The Warlords of Legio Crucius (2:1) repel the Dark Mechanicum and the Chaos Knights.

The Dark Mechanicum and the Chaos Knights fell upon the plasma forge world of Ryza. The loyalist Legio Crucius (the “Warlords”), outnumbered roughly two to one, met the Despoilers of Legio Vulturum at the Salvation Isthmus. Ryza held, preserving for the Imperium its unrivalled plasma production.

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Loyalists

Special forces

Traitors

Special forces

Type
Siege
Scale
2 of 5

Significance

A forge world unsurpassed in plasma is held for the Imperium.

Disputed in the canon

  • The exact year is not fixed — during the Heresy. The plasma forge world of Legio Crucius.

Sources

  1. Lexicanum: Defence of Ryza
  2. Fandom: Legio Crucius
  3. Atlas compilation · source check 2026

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