I only saw it once, but remember if vividly.

There is a large group of people at this castle type house high on a hillside. One by one, they start dying. Each death is related to one of the 7 Deadly Sins. ((The glutton is poisoned, greed is smothered in a pile of gold, ect))

The mistress of the house, who turns out to be something like the devil, makes a deal with a priest. He agrees to stay at the house with her, in exchange for letting everyone go.

I'm a little sketchy, but I'm pretty sure the movie ends with everyone back on the bus driving away from the castle type house and there is a nasty accident where everyone is killed except the devil lady and the priest.

Anyone else see this movie and know what I'm talking about?

Think you're looking for this:
La Plus longue nuit du diable (The Devil's Nightmare)(Vampire Playgirls)(Castle of Death) - Rotten Tomatoes

The Devil's Nightmare - Wikipedia, the free encyclopedia

La plus longue nuit du diable (1971) - IMDb

Yep, that is it exactly. Thank you.

I was much younger when I saw it, and I certainly don't remember it looking that... cheesy, lol. But word on the vine is a remake is in the works, so I can enjoy it all over again.

Thanks again!

:)