Wolfgang Holswig-Abenauer

Wolfgang Holswig-Abenauer is the nephew of Karl Franz through his sister.

Wolfgang in Death on the Reik is the nephew who is mentioned in a rumor to be imprisoned within his own castle by the order of Emperor Franz although the cause is not clear as the given reasons are that he has become a Chaos Mutant with a rat tail, has the plague, or is being protected from assassination attempts by his brothers.

In Empire in Flames, a supplement for Warhammer Fantasy Roleplay, Wolfgang is Karl's nephew, and is an extremely mutated Chaos Mutant who has extended eyes like a slug, large bat wings, a bloated and misshapen face, and long claws. This is hidden by another mutation, Illusion of Normalcy, which requires concentration to maintain.