Tomb of the Werewolf

In order to maintain her youth and beauty, Elizabeth Bathory made a pact many years ago with Satan that requires her to sacrifice young women and bathe in their blood. Among her many atrocities, Elizabeth is also reputed to have tricked Count Waldemar Daninsky into trading his mortal soul to save the life of his wife Eleanor, who was dying of the plague, only to slay her himself when the curse of the werewolf came upon him. (imdb)