Rahadin is a loyal ally of Strahd who traveled with the waffle crew for a time disguised as Kasimir. Rahadin trapped the group in the Amber Temple, and tried to attack Paultin when he fled Castle Ravenloft.
When the waffle crew traveled into Barovia's past, they encountered Rahadin. Even back then, he was a loyal agent of Strahd. When Rahadin tried to stop Sergei and Tatyana fleeing the wedding in a carriage, he was trampled by horses and half his face was disfigured.The waffle crew gave Rahadin the Tome of Strahd, hoping that he would read it and understand what Strahd would become.