How did the tv series Merlin end?

The TV series "Merlin" concluded with its fifth season, where the final episodes culminate in a dramatic confrontation between Merlin and the forces threatening Camelot. In the series finale, titled "The Diamond of the Day," Arthur faces betrayal and is mortally wounded in battle. To protect Arthur's legacy and ensure that magic can one day return to Camelot, Merlin uses a powerful spell, ultimately revealing his true identity as a sorcerer. The series ends on a poignant note, with Merlin waiting for the day when Arthur will return, emphasizing themes of friendship, sacrifice, and the enduring power of hope.