Merlin: Season 4, Episode 10

4 - 10: A Herald of the New Age

The Camelot Knights stumble across a ghostly shrine deep in the forest, its eerie atmosphere betraying a dark history better left undisturbed. By ignoring Merlin's warning, Elyan's actions spark a chain of events more frightening than anyone could possibly have imagined. Can a grievous wrong be put right before past demons change the future forever?