Thiên mệnh anh hùng (天命英雄), known as Blood Letter and Sword of the Assassin in English, is a 2012 Vietnamese martial arts action fantasy directed by Victor Vu, produced by Phuong Nam Films and Saiga Films, in association with BHD. One of the most expensive Vietnamese films ever made, Blood Letter is considered the first film of its kind, Kiem Hiep (Sword fighter Adventures) in Vietnam. It was released theatrically in Vietnam on January 20, 2012 by Megastar Media. The film was going to be the official submission for Vietnam to the 86th Academy Awards for Best Foreign Language Film. However, on 19 September 2013, the National Cinema Department announced that the film did not meet the AMPAS criteria for distribution.