Good article. Chose Esperanto because it sounded creepy. The film seems to be cursed:
Ann Atmar, who played one of the film’s succubi, committed suicide shortly after filming ended.
A few months later, Milos Milos, a Serbian actor who played the titular incubus, murdered Barbara Ann Thomason—the estranged wife of comedian Mickey Rooney—and then killed himself in Rooney’s bed.
Then, in 1968, the daughter of another actress in the film, Eloise Hardt, was kidnapped and murdered. Her killer was never identified, but police believed she may have been murdered by members of the Manson family, who would kill actress Sharon Tate a year later. Tate attended the Incubus premiere with her boyfriend at the time, movie director Roman Polanski.
Others involved with Incubus were beset by yet more unfortunate events: Stevens’s production company went under, the music editor was imprisoned for scalping Super Bowl tickets, and most prints of the film itself were destroyed in a fire. Many believed the film was cursed.