The Imperial Harbingers is a Loyalist Space Marine Chapter of unknown origin that was raised during the 23rd Founding in the 37th Millennium. The Harbingers spend much of their time pursuing one Imperial Crusade after another.
The Imperial Harbingers Chapter was created during the 23rd Founding, the so-called "Sentinel Founding", to help replace the considerable losses suffered by the Adeptus Astartes in the preceding millennia. Along with several other Chapters, the Imperial Harbingers was from the outset conceived as a replacement Chapter that would spend its existence on continuous Crusade and was to be created from the most stable gene-seed stocks available to the Adeptus Mechanicus. Like many of the Space Marine Chapters created during this tumultuous period in Imperial history, its exact progenitor Chapter remains unknown. The Harbingers consider themselves sworn enemies of the Death Guard Traitor Legion.
The Imperial Harbingers primarily wear light grey Power Armour. The Aquila or Imperialis on the chest guard is silver. The black squad specialty symbol (Tactical, Assault, Devastator or Veteran) is designated on the right shoulder plate. A white Roman numeral centred on the squad specialty symbol designates squad number. The colour of the helm indicates company number in accordance with the Codex Astartes -- i.e. White (1st Company), Yellow (2nd Company), Red (3rd Company), Green (4th Company), etc.
The Imperial Harbingers' Chapter badge is a large white skull in profile, engulfed by flames, on a field of light grey.
- How to Paint Space Marines, pg. 89
- Imperial Armour Volume Nine - The Badab War - Part One, pg. 74
- Insignium Astartes: The Uniforms and Regalia of the Space Marines, pg. 54