I was thinking like Newt was badlly abused by his family(not sexually) becoming a obscurial. He controls it trough a spell/ward (he create it) that is anchoring in a ring or neckleace or earing (your joice) and needs to be recharge weekly trough a ritual. Some time after the movie, Newt and the Real!Graves start dating. Graves notices the ritual and sees the singnals of abuse (being a Auror) but doesn't confront Newt. Grindelwald returns, seeking revenge at MACUSA . In the end Newt saves the day by reavealing his condition and accidentlly kills Grindelwald. Everybody is understanding of the condition and fluf happens.