Fan Casting Acolyte

Gellert Grindelwald grooms a young prodigal wizard named Felix to become his personal assassin to assist him in his pursuit for pure blood supremacy. Tasked to assassinate wizards and witches of importance from each Ministry of Magic, he slowly learns of their intentions and even learns about who he really is. (This is separate from Fantastic Beasts as it is more so an alternative story that will focus on the character's eventual involvement in the altercation between Grindelwald and Dumbledore.)