Fourscore and seven years ago our fathers brought forth on this planet, a new hive, conceived in labor, and dedicated to the proposition that all men are created equal. But they were wrong...
The chosen of Mortarion are a particularly deadly breed of heretic. Unlike the World Eaters and Emperor's Children, which descended into anarchy, or the Thousand Sons, which seem to have disappeared altogether, the Death Guard have retained much of their previous structure. When facing off against the forces of the Death Guard, we cannot rely on their lack of organization to provide exploitable weakness, as we can against other traitors. Although followers of Chaos, they possess a strange order...
-Excerpt from the Reports of Inquisitor Corrigan, 3 226 765.M38