Dream of demons

I'm dressed in a black jacket with a short sword in my hand fighting a large man with a mohawk and wearing a grey trench coat on top a mountain while an army of demons fight my human soldiers below. There are grey skies over head and thunder booming, we are fighting over something a book or a ring. Then the dreams splits to show if i win, the world gets peace forever and i live below the mountain but if he wins the devil takes over the world and kills all humans