Imperial Armour 7: The Siege of Vraks, part 3 (2009), p141-142 — Forces of Chaos

Lords of Decay
Large Deathguard sub-faction. Multiple encounters with the warband over past millennium. Have formerly been led by the Primarch Mortarion.

The Purge
Nurgle worshippers. Infamous for genocidal campaigns and indiscriminate use of chemical weapons. Post-Vraks campaign location unknown.

The Tainted
Large Deathguard sub-faction. Now connected with the daemon-prince Mamon.

Apostles of Contagion
Led by Necrosius, the self-proclaimed 'Hand of Nurgle'. Thought to be responsible for plague zombie infestations across Vraks. Heavy losses inflicted upon the warband during the Vraks war.