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									Horned rat I think is just the ideology of the hooded man who supposedly created the Skaven according to the history of them but I don't think the 'horned rat' while it might have been something chaos may have had a part in, isn't actually anything directly linked to chaos.
  
  It would be uncharacteristic of the great 4 to hide behind the guise of a hooded / horned rat and see there forces separate from one another.
  
  As for who the hooded man in there background is, could quite easily of been a servant of chaos placing a curse that merely went beyond his control. At the same time though it could of been any number of people, could even of been Sigmar after he vanished to the north (if the timeline cooperates) its really hard to tell.
							 
							
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