Plot details are being kept in the cloister, but Bichir will play a priest named Father Burke who is dispatched by Rome to investigate the mysterious death of a nun.

Wan, who is prepping to shoot Warner Bros.’ massive Aquaman movie, remains deeply involved with the project. He is producing, via his Atomic Monster production label, with Peter Safran and co-wrote the script with Gary Dauberman.

The demonic nun was a character added late in the production of Conjuring 2 during reshoots that occurred just months before its release when Wan had an idea to reconceive a demon — but her scenes' intensity took hold of audiences' fears as the movie scared up $320 million at the global box office on a budget of only $40 million.

The Nun is the second title to spin off from the Conjuring universe, with Annabelle being the first. A sequel to the latter, Annabelle: Creation, is set to open Aug. 11. That movie could propel the franchise — which has grossed over $897 million so far with just three low- to moderately budgeted films — past a billion dollars.

The Nun, meanwhile, has been blessed with a July 13, 2018, release. A shoot in Romania is set for this summer.

Bichir’s performance in the 2011 drama A Better Life earned him an Academy Award nomination as well as noms for an Independent Spirit Award and a SAG Award.

The CAA-repped actor is a multiple nominee and winner of an Ariel Award, the Oscar of his native Mexico, and has Universal’s Lowriders awaiting release. Bichir also will be seen in Ridley Scott’s upcoming Alien: Covenant.