Is The Terror on Netflix? The Terror currently hasn't announced plans for its streaming home. Only Amazon is carrying the show with weekly drops on its video on demand service. You can find it through the AMC channel on Amazon but it's not part of the Prime subscription.
The Nun movies are actually prequels to The Conjuring series. While The Nun and its sequel take part in the 1950s, The Conjuring is set in the 1970s. Valak torments a young nun throughout the series, and it's only when Lorraine encounters Valak two decades after that we see the demon defeated.