Most tribes of northmen do have a patron god, however. They all acknowledge the other three as divine entities, and make offers to them as well-- but the vast majority of northern tribes favor one god over the others to some degree or another.
Warriors are each champions of a specific god-- they are wanderers, removed from their tribes and bound together by the will of a more powerful champion of their shared patron. It's unusual to have Warriors of Nurgle, for example, following a Lord of Tzeentch; but not unheard of. Armies that are a mish-mash of different marks are most easily explained by saying they're part of a greater whole, such as Archaeon's horde.
Warriors are each champions of a specific god-- they are wanderers, removed from their tribes and bound together by the will of a more powerful champion of their shared patron. It's unusual to have Warriors of Nurgle, for example, following a Lord of Tzeentch; but not unheard of. Armies that are a mish-mash of different marks are most easily explained by saying they're part of a greater whole, such as Archaeon's horde.
