"The birthplace of magic," Taliesin had called it. But to Merlin, it felt like a cage.
As the episode ends, the vision is fulfilled, yet the cost is higher than he imagined. Morgana lives, her secret parentage revealed to her in the shadows, her hatred for Uther now fueled by the very blood they share. [S3E5] The Crystal Cave
I can stop it, he thought, the heartbeat of the cave pulsing in his ears. I have seen the threads; I can cut them. "The birthplace of magic," Taliesin had called it