The tale of how the Rubric Marines came upon their unique fate is a twisted one. It has its beginnings in the time when the Emperor's Primarchs were mysteriously scattered from their incubation upon Terra. The one who would be called Magnus came to rest upon the remote colony world of Prospero. He could hardly have been more fortunate: Magnus was a ruddy-skinned mutant who would have been feared and most probably slaughtered had he arrived on any other world in the Imperium. Instead, he was delivered upon a hidden planet of kindred spirits, because, as fortune would have it, a commune of outcast human psykers had settled the planet Prospero.