Alejandro Ulloa, the film's cinematographer, used a fog machine and a soft-focus lens with special filters to give the film an ethereal ambiance.
The film "Conquest" was released in Italy on June 2, 1983, and later in the United States in April 1984. It was noted for its derivative nature and low budget, but some critics found it surprisingly entertaining despite these limitations.
Lucio Fulci said in an interview that the film's quality of being low budget did not detract from its entertainment value. He emphasized the importance of the visual elements, such as the fog-covered lands and the weird denizens that populate the film, which he believed would linger in the viewer's mind as the work of an artist with a distinctive visual style.
Despite being a flop in Italy, the film was well-received in Mexico, where the lead actor George Rivero was popular.
Lucio Fulci's contract with producer Giovanni Di Clemente ended after disagreements during the making of "Conquest," and Fulci left immediately after shooting the film, refusing to complete the contract.