Create an image of a Viking soldier standing triumphantly on a battlefield, raising his bloody axe high in the air. The soldier should have a fierce expression, with his mouth open in a victorious battle cry, conveying his triumph. He should have one foot placed firmly on the chest of his defeated opponent, emphasizing his dominance. The background should depict a dramatic night sky filled with dark clouds and flashes of lightning, enhancing the intensity of the scene. Incorporate elements like fallen shields and weapons scattered across the ground to reflect the chaos of battle.