Merlin S03E08 : The Eye of the Phoenix

Arthur leaves on a solitary quest to retrieve the Golden Trident from the Fisher King so that he can prove that he is worthy of being the next king of Camelot. Morgana decides that she has an opportunity to use her dark magic and she ends up gives him a precious bracelet containing a Phoenix Eye which puts him in danger. Merlin with Gwaine's help tries to save Arthur.