When The Nun wrapped, many fans thought the story with Valak was over. It showed how Valak possessed Frenchie and ended up marking Lorraine Warren to kickstart the first Conjuring movie years later. Interestingly, The Nun II is expanding on Frenchie's possession and what Valak truly craves.
Source：https://www.cbr.com/how-the-nun-2-connects-the-conjuring/
