[s3e5] The Crystal Cave Now

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.

But destiny is a cruel weaver. Back in the stone halls of Camelot, every move Merlin made to save the King only drew the noose tighter. A warning to Gaius was met with skepticism; an attempt to intervene led to a fall that nearly claimed Morgana’s life. He watched in horror as the very dagger he feared was placed into her hands—a gift from the Prince, just as the crystals had promised. [S3E5] The Crystal Cave

This request refers to the fifth episode of the third series of the BBC show , titled " The Crystal Cave ". In this episode, the young warlock Merlin is shown a glimpse of the future by the sorcerer Taliesin, leading to a series of events where Merlin’s attempts to change fate inadvertently bring it to pass. As the episode ends, the vision is fulfilled,

The air in the cave did not breathe. It was still, heavy with the scent of ancient earth and the hum of power that had existed before the first king of Camelot drew breath. Merlin stood amidst the jagged glass, his own reflection shattered a thousand times over in the facets of the crystals. Back in the stone halls of Camelot, every

Merlin remains the silent guardian, standing in the courtyard as the sun sets over the citadel, knowing now that some paths are carved in stone, and even magic cannot wash them away.

I can stop it, he thought, the heartbeat of the cave pulsing in his ears. I have seen the threads; I can cut them.