Shot in 21 days.
Matthew Fox has said that he enjoyed making this movie more than any other film, and always wanted to be in a western.
At Fantastic Fest, S. Craig Zahler said that he wanted much of the film's mysticism to remain ambiguous and debatable.
The cave set in the last act of the movie was the same cave set used in Iron Man (2008) where Tony Stark is held captive and constructs the first iron man suit.
After reading S. Craig Zahler's second novel called "Wraiths of the Broken Land" (2013), Kurt Russell stated that "Zahler's a fabulous story teller whose style catapults his reader into the turn of the century West with a ferocious sense of authenticity." The phrase is written on the back cover of the book.
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