Bloodbath at the House of Death (1984)

Storyline:

Bloodbath at the House of Death (1984) Six scientists investigate a strange phenomenon at the creepy Headstone Manor, the site of a mysterious massacre years earlier that took the lives of 18 guests in one night. It turns out that the house is the place of a Satanic cult led by a sinister monk who plans to kill the scientists who are inhabiting this house of Satan.