In the brand new season of Merlin, Camelot stands on the brink of a golden age. But its birth will not be an easy one. For the forces of evil are gathering and the darkest hour is just before the dawn. Merlin faces his greatest challenge yet when the sorceress Morgana, at the peak of her powers, unleashes mighty forces from another world in her bid to destroy Arthur’s destiny. When Arthur discovers that swords and shields won’t be enough to protect his beloved kingdom, it will fall to Merlin to make the ultimate sacrifice. Friendship and loyalty must be tested by metal and fire, before Camelot —and the world as Merlin and Arthur know it— is changed forever.