The Conjuring 2 replaced a cool devil man design with its scary nun, James Wan explains
Wan showed footage of an unused demon costume that was replaced with The Conjuring 2's nun at the last minute

The Conjuring movies are pretty good, pretty scary demon-centric horror films. As a side effect of being pretty good, pretty scary demon-centric horror films that star ghost-hunting Christian hucksters, they’re also movies that serve a secondary function as nightmare advertisements for the power of Christ to defeat even the scariest ghouls and ghosts.
In light of this, it isn’t surprising that one of the series’ breakout specters is a spooky nun, who first appeared in the second Conjuring to terrify lapsed Catholics with memories of being yelled at by habit-wearing spinsters before she embarked on a solo career with her very own spin-off movie.
As The Conjuring 2 director James Wan explains in a recent Instagram post, this scary nun almost didn’t appear in the movie. She was, in fact, originally meant to be portrayed in the much cooler form of a towering, horned devil man that Wan’s shown off on his Instagram and described as “the best demon I never used.”