To Bare Our Teeth and Our Hearts
An execution was not exactly on Merlin's bucket list, wasn't even what destiny had intended for him, but it would figure that Uther Pendragon's final act would be one last strike against magic. On the bright side—because Merlin's nothing if not desperate for silver linings—he gets to learn more about magic and its still existing community than the castle he has once called home could've ever offered him. And when he finally returns, things might've just changed enough for all of them to have a chance at a better future than fate had planned.
Arthur, for his part, really wants to catch a break, and to stop thinking about his late manservant. It should probably be less of a shock that it does not work out so neatly. Between concerning dreams, the realisation of just how wrong his father was—about nearly everything, really—and trying to deal with the loss of the person closest to him, Arthur learns a few things about making choices that aren't always easy, but right.
Or sometimes, things have to go downhill first before they get better, and if Uther had known about the eventual outcome, he might've changed his mind for once in his life.