Osgar, a sorcerer who has killed one of Arthur’s knights and is in turn slain, gives the king a runemark from the Disir, a trio of priestesses for the gods of the Old Religion, urging Arthur to allow magic or face fatal consequences for himself and Camelot. Arthur and his men go to meet the Disir where Mordred is wounded, apparently fatally, saving Arthur’s life when the women attack. Arthur begs for Mordred’s life and is told that the price he must pay is to legalise sorcery and embrace the Old Religion. Under advice from Merlin, who is aware of the prophecy and …
Watch It Here : Merlin Season 5 Episode 5