In medieval times, religious Knights massacre a village of witches and build a Cathedral on top of their mass grave. In present-days, the church's librarian (Tomas Arana) accidentally unleashes the evil which had laid under the edifice since the massacre. This sets off mechanisms built into the infrastructure which trap priests and churchgoers, who all fall prey to the waking demons and satanic spirits.
A film I watched when I was younger purely based on Dario Argento having something to do with it, he didn't direct it he was a producer and was involved in the writing of it and I can remember being disappointed.
Well turns out the film was better than I remembered, nothing special but not bad.
Fairly basic script but well shot and acted, stars a 14 year old Asia Argento and a bloke from Casualty! Some pretty decent FX too.