Beast of Blood

Beast of Blood, released in the UK as Blood Devils, is a 1970 Filipino horror film. A sequel to The Mad Doctor of Blood Island, it was directed by Eddie Romero. It was the fourth in a series of four Filipino horror films, produced by Romero and Kane W. Lynn, known as the "Blood Island" series, which also included Terror Is a Man, Brides of Blood and The Mad Doctor of Blood Island. It was also Romero's last film for Lynn's Hemisphere Pictures, as the two went their separate ways after this film was completed.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.

Poster © the film's rights holders.