An old flame of Gaius's returns to Camelot, but Merlin's loyalty is tested when he learns she is using dark magic to plot against Uther
They wanted me to join them
Child of the Dark Prophecy
Before his magic kills the king, drastic measures are to be taken
The internal conflict as well as the post battle emotions are down very well
They wanted me to join them
They spent 5 seasons promising Merlin was helping Arthur be the greatest king, promising Arthur was going to change the world and bring magic back