[s3e5] The Crystal Cave -

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.

In one shard, he saw a birthday celebration—Morgana, radiant and smiling, accepting a gift from Arthur. In another, a darker image: a dagger, silver and sharp, held by a hand he recognized too well, poised over a sleeping Uther. [S3E5] The Crystal Cave

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