In the movie I watched, I think there was a man who is killing people at the behest of his mother's spirit, though I'm not sure on that part.
There was a scene where a group of characters communicates with this woman's spirit using dice. One person would ask her a question and then roll dice with letters on them. That person would then make out what words these dice spell out. In one instance, they ask the spirit what they will find at their location, to which the dice spell out "Mors". One of the characters realizes that this means "Death" in Latin just as the spirit drops a chandelier on them, but they manage to dodge it.
Then, the killer tells the others to ask her what is behind his back, and the other characters comply. The spirit's answer is "Knife", at which point I think the killer starts attacking them, though I'm not sure about that either.