Trama

Morgana takes the dying Morgause to the Isle of the Blessed where she unwittingly tears the veil to the spirit world, unleashing the Dorocha, invisible ghosts that begin to attack the kingdom. At Camelot, where a weakened Uther has given over much of his rule to his scheming brother-in-law Agravaine, Merlin senses what is happening but finds his magic inadequate to stop it. As Camelot fills with refugees, Gaius reasons that, as one death opened the portal, only another will close it. Arthur offers himself as the sacrifice and travels to the Isle of the Blessed with Merlin and a group of young knights. Here, after Arthur has finally praised him for his bravery, Merlin appears to have a fatal encounter with one of the Dorocha.—don @ minifie-1

Morgana will take the wounded Morgause to the Isle of the Blessed, Merlin is to face his toughest challenge yet when Morgana's blind determination puts at risk Arthur's future as well as the very balance of the world. Morgana uses powerful magic to tear "the mystical veil between our world and the next." The Cailleach a "terrifying gatekeeper to the spirit world and her people The Dorocha (or shadow people) creatures are released and wander around, killing everyone who succumbs to their touch. With Uther but a mere shadow of his former self, it comes down to Arthur and his loyal knights to safeguard the kingdom. However, swords won't be enough to vanquish the newest threat and Merlin is utterly shocked to find out what it'll take to restore the equilibrium of the world: a sacrifice of unimaginable proportions is required.