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Excommunicate Traitoris is the term used in reference to Space Marine Legions or Chapters that have betrayed the Imperium through heresy, mutation or any other act the

Stamp of the Excommuncate Traitoris

Imperium deems unforgivable. Several forces have been deemed Excommunicate, such as the Traitor Legions¹, the Flame Falcons, the Relictors and the Soul Drinkers². They are also known as Renegade chapters.

This fate may also befall individuals whom commit similar acts of heresy³.

Sources

• ¹ Codex: Space Marines (3rd Edition)
• ² Soul Drinkers (Novel Series) by Ben Counter
• ³ Dark Heresy: Ascension