By: Shannon Page Vin Diesel (Fast & Furious 6, Guardians of the Galaxy) carries most of the weight in The Last Witch Hunter, director Breck Eisner’s fantasy-thriller about a medieval warrior (Diesel) cursed with immortality and locked in an eight-hundred year battle against evil magical forces bent on the destruction of humanity. Diesel’s wooden performance does nothing to distract from the fact that the script is tired and obvious, but even the most worn-out premises…