Blood Sabbath (1972)
A young man named David unknowingly ventures into a land controlled by the powerful witch queen, Alotta, and her coven. Every year the local villagers must offer a child to the queen in order to maintain a pact of peace. But David has fallen in love with a river nymph named Yyala and he cannot have a relationship with her as long as he has a soul. So, he offers his soul to Alotta in exchange for the life of a sacrificial child. Now David and Yyala can be together, but if Yyala ever abandons him, his life belongs to the witch... witch, sale of soul, human sacrifice, coven (akelarre), nymph, pact
ETC.
