Undivided, and the vast majority of his troops celebrate Chaos in its purest, undiluted form. An army led by Crom the Conqueror has the following special rules:

• Units of Chaos Warriors or Knights bearing any Mark other than Chaos Undivided count as Special units. Any unit of Chaos Warriors or Knights bearing any Mark other than Chaos Undivided which has been upgraded to Chosen counts as a rare choice.

• Daemons of all types also count as Rare units.

• All Marauder and Marauder Horsemen units may have the Mark of Chaos Undivided for free. They may not be given any other Marks