La segua (1985)

This rare Costa Rican story takes place at the end of the colonial era and involves superstition, possession and female sorcerers. Encarnacion (Isabel Hidalgo) is a beautiful villager and Petronila (Blanca Guerra) is her jealous, and evil nemesis. When Petronila's love interest, a fetching young Spanish lieutenant, starts to fall for Encarnacion, Petronila gets even by simply destroying his sanity with a vile potion. A similar episode occurs when another stranger comes to look for gold and gets involved with Encarnacion. Finally, Petronila sees Encarnacion herself as the basic problem and begins to delude her with suggestions that she is actually a "segua" or a female spirit that attacks men.