The Exorcist: Believer doesn’t have much going on in terms of demons, but there is one blink-and-you’ll-miss-it moment with a giant demon that almost played a larger role in the movie.

The demon is called Lamashtu, and while it doesn’t get much of a shoutout in the movie itself, according to Believer’s special makeup effects head, Christopher Allen Nelson, it was one of the most intricate and complicated pieces of the entire production.

The Intricate Design of Lamashtu

“You see [Lamashtu] very abstractly in the final exorcism,” Nelson explained. “But we did an entire head-to-toe prosthetic suit, harness, wings, horns, a full realization of Lamashtu which I’m very, very proud of and was very difficult. It was five and a half hours of makeup in, about an hour and a half makeup out, including a 12-hour shoot day.”