Destined to Rule

When Merlin starts having peculiar visions about a land he never saw before, he decides to investigate. But little does he know that when he sneaks out to find this land and help its endangered people, Arthur followes him. Throughout the journey the Prince of Camelot doesn't only learn new things about Merlin, but about himself and their joined destinies, as well.
Who knows, they might even swap roles and Merlin becomes king, while Arthur is just a knight?