Try running as administrator to edit the default domain policy . That should do it . <| sep |> Well , of course Credence knew about his magical ability . As Newt explains , an Obscurus is created when a young witchwizard tries to suppress herhis magic . Obviously Credence believes in witchcraft , as the Second Salemers are obsessed with it . If his ma finds out about what he can do , then he could be killed . So he suppresses it , creating the Obscurus . It ' s also important to note that this is exactly what happened with Ariana Dumbledore if you recall , at at young age she was attacked by Muggle boys for doing magic , and after that she suppressed her magic until an Obscurus was formed . I don ' t think Credence would tell Graves anything , especially because Graves was acting like the Obscurial was an evil entity or something bad . Credence only lets loose after his mother is dead , because he has nothing left to hide .