‘The Northman’ goes heavy on blood-soaked style and light on substance

Part “Hamlet,” part “Conan the Barbarian” and a whole lot of “Vikings,” “The Northman” is a gorgeously shot exercise in visceral thrills that goes heavy on atmospherics and very, very light on story. Director/co-writer Robert Eggers (“The Lighthouse”) has sought to make the definitive Viking movie, and while the film issues a guttural cry for theatrical viewing, it is built around such a basic revenge plot as to blunt those simple charms.