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As title goes the Wight King does not have access to his Barded Horse in campaign. I turned off all mods with the exception of "Adventuring Party - All-in-one" so I can easily spot which mod affected the Wight king. I doubt that mod affects the Skill trees so I'm assuming the issue arose when CA streamlined mount level requirements for all characters as the Barded Horse was previously a second tier to the skeletal horse rather than a second skill.