A man riding a horse in front of a giant dragon

/imagine prompt: Epic fantasy battles across vast plains, Armies of mythical creatures and warriors fight each other, Wielding fantastic weapons, A storm is brewing in the dark sky, Lightning strikes the ground, Flying dragon above, Heroism in troubled times, An artwork of, mixed media, Combine digital painting with traditional painting，for action, Dynamic and detailed, --16:9-5 p.m.'bell