The Casket of Avalon

Cain, the last descendant of Merlin’s bloodline, accidentally activates the ancestral Box of Arthur, which opens a portal to Camelot of the 6th century AD. He uses modern technology and knowledge to save Queen Guinevere under siege. Yet the rift collapses, leaving him wandering for a thousand years in search of her. At long last, he is reunited with the Dragon-Blood Queen, who has waited for him for fifteen hundred years.