The Beyond

E tu vivrai nel terrore! L'aldila (lit. And you will live in terror! The afterlife), known in English as The Beyond or 7 Doors of Death, is a 1981 surrealist exploitation horror film directed by Lucio Fulci, loosely based on the works of H. P. Lovecraft and Clark Ashton Smith.

Set in Louisiana, the film opens in 1927 with a painter named Schweick painting a vision of Hell in the basement of the Seven Doors Hotel when a lynch mob breaks in and murders him with quicklime, believing him to be a warlock. Shifting to the "present day", a young woman from New York named Liza Merril (Catriona Maccoll) has inherited the hotel and is renovating it. The activities of the contractors open the Gate of Hell the hotel is built over. Mysterious deaths and incidents ensue, with Liza and a local doctor encountering a mysterious blind girl who wants them to leave the hotel, a mystic tome called the Book of Eibon that supposedly contains the answers to the nightmare at hand, face-eating tarantulas, Schweick's ghoul, and eventually the rising dead. It ends with the two passing into the afterlife, which is depicted as a blank gray wasteland littered with corpses.

Example of:
Cosmic Horror Story