Iron Purity

Origins
Founded after the Horus Heresy, they are a chapter with troubled origins, only a few members of the chapter's staff know who their primogenitor is, although they are increasingly rare to hold this information. Their origins suggest an Ultramarine descent, although this has never been confirmed by any institution of the Imperium or Iron Purity itself. They have been working for Segmentum Ultima for 10,000 years, going where their talents are needed.

Their origins are sufficiently fuzzy to make each chapter master fear the impromptu visit of the Holy Inquisition. Since the almost total loss of their archives, they also lost all traces of their Primogenitor. Their traditions as well as their affinities with certain strategies, reinforce the fear of an unenlightened ancestry among the brothers.