Alucarda

Alucarda Spanish title Alucarda, la hija de las tinieblas, or Alucarda, the daughter of darkness is a 1978 Mexican horror film directed by Juan Lpez Moctezuma, and starring Tina Romero in the title role. Often thought to be based on the 1872 novella Carmilla, it revolves around two teenage orphan girls living in a Catholic convent, who unleash a demonic force and become possessed by Satan. Though it is a Mexican Spanish language film, it was originally filmed in English, as evidenced by the fact that the lip movements match the dubbed English dialogue. It was released in theaters across Mexico on January 26, 1978.

While playing in the nearby forest, the girls stumble upon a band of mysterious gypsies and subsequently unleash a demonic force after opening a casket at a nearby burial site. A bloody chain of events follows after both Alucarda and Justine become possessed by the Satanic entity and wreak havoc on the convent and its inhabitants.Alucarda is notorious for its extreme subject matter and themes, which includes that of Satanism, murder, demonic possession, exorcism, orgies, and lesbianism, among other things, within a religious setting. All of these things made the film controversial, especially for the time it was made. Because of its extreme violence, scenes of sacrilege, and perversely defiled religious imagery, it has gained notoriety among fans of the horror genre. Although the film continues to be situated in this genre, it is undergirded by antigovernment and anticlerical sentiments that are manifest in the exaggerated idolatry, representations of clerics as tyrants and persecutors, and overt iconoclasm. ........

Source: Wikipedia