Albeit an obvious plot, this is a nice film.
In a blender, put ¼ Lord of the Rings, ¼ Pirates of the Caribbean, ¼ Game of Thrones, and ¼ of whatever you may find about the Arthurian myth.
Mix at maximum speed.
Throw the blender into a tornado, in case of it's not fucked up enough.
Then you have this ridiculous film.