In the Shadowlands, many tribes and cans are connected through their adulation of the Ruinous Powers, allied in the names of the totemic powers they favour and united by shared beliefs. For many, belonging to one of these sects is the first step upon the Path to Glory, the start of a quest to earn the favour of the Ruinous Powers.
BackSource: Warhammer: The Old World Online Rules Index
Chaotic CultsURL Copied!
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All models that represent members of the Marauder Tribes have the Mark of Chaos Undivided listed among their special rules. Of those, some have the option to replace the Mark of Chaos Undivided with the Mark of a specific Chaos god. Units of Chaos Marauders and Marauder Horsemen instead have the option to belong to a 'Chaotic Cult':
A model cannot belong to more than one Chaotic Cult.
A character with a Mark of Chaos can join a unit belonging to any Chaotic Cult as normal.