The Hollow Queen (S05E08)

Merlin finds himself compelled to embark on a perilous quest when he agrees to assist a young Druid boy, leaving Camelot behind. With the citadel preoccupied by the menacing presence of the Sarrum of Amata, his departure goes unnoticed. However, as ominous clouds gather, Merlin's instincts kick in—he begins to question Daegal's true nature. Can someone as merciless as the Sarrum ever be trusted? It soon becomes clear to the young warlock that he may have made a grave error in judgment.