Incubus (1966 film)

Incubus Esperanto Inkubo is a 1966 blackandwhite American horror film filmed entirely in the constructed language Esperanto. It was directed by Leslie Stevens, creator of The Outer Limits, and stars William Shatner, shortly before he would begin his work on Star Trek. The films cinematography was by Conrad Hall, who went on to win three Academy Awards for his work on the films Butch Cassidy and the Sundance Kid, American Beauty and Road to Perdition.

The film is set in the village of Nomen Tuum Latin, your name, which has a well that can heal the sick and make a person more beautiful. Because of the latter, many conceited or corrupt individuals come to the village for this cosmetic effect. The village has notoriety for its magical water, as well as being a ground for darkness and demons. Along the village, succubi entice the tainted souls who come to Nomen Tuum and lead them to their deaths in order to offer their souls to Hellthe God of Darkness. A prominent young succubus named Kia Allyson Ames loathes the routine of herding sinners to hell. Kia claims her powers are being wasted, and needs somethingsomeone more stimulating as her prey. Her sister succubus, Amael Eloise Hardt, warns Kia of the danger that a pure soul will bring love. Kia persists anyway and attempts to find a clergyman to seduce into darkness. After watching their behaviour however, she realizes these men are just as iniquitous and shrewd as her previous victims.She soon stumbles upon a suitable victim Marc Shatner, a young soldier, who with his sister Arndis Ann Atmar comes to the sacred water in order to heal his battlewounds. Kia then continues to follow the siblings and pretends to be lost. After a brief eclipse, Kia convinces Marc to accompany her to the sea. During the eclipse, Arndis becomes blind from looking into the sky. Disoriented, she stumbles around in order to find Marc. Marc and Kia quickly become attracted to each other. ........

Source: Wikipedia