The Priests of Iron masked vast technological lore behind an outwardly barbaric show of tech-mysticism whose temper - if not form - would do justice to the most obtusely arcane tech-adept of Mars. They were the masters of the armouries, war machines and technological arcana of the Space Wolves Legion. There were several divisions of particular prominence, with the 'Priests of Iron' being one of them. Occluded to outsiders beneath webs of what outwardly seemed superstition and barbarism, they were more than technicians and specialists, but instead the repositories of the Legion's true history, the keepers of its secrets and the masters of its lore.
They were one of several subdivisions within the Priests of Fenris, the interconnected orders which provided for the physical, spiritual and technological needs of the VI Legion. The role of Iron Priest harkens back to the bygone era of the Great Crusade in the last two centuries of the 30th Millennium.