Craftsman: Blood Forge

Brothers find ancient relics while camping that pull them into an alternate world amid warring tribes of ancient Ireland. The magic drops them in different places and times and inadvertently resurrects brutal princes who resume an age-old struggle for domination. Separated and hopelessly outnumbered the brothers must unite warring clans to prevent either prince from gaining all five of the aged artifacts, which as a set would give the wielder god-like power and fulfill a dreaded prophecy of world-wide destruction.