Board Thread:General Discussion/@comment-11464223-20151109020125/@comment-25926288-20151109040448

Farerb wrote: I don't get why they contradicted what they said in 4x23 about Merlin fighting the Darkness and tethering it onto a person. It happened 7 episodes ago! I'll simply say that Apprentice was hyping it up. Merlin did try fight the Darkness  in Nimue and the Dark One she became and eventually tethered her soul to the dagger. So, not the Darkness to a human soul, but the Darkness of her soul (or heart) to the dagger.

Now for their explanation: Apprentice was an old man and probably mixed up a few things.

Now, you should actually be made at how Rumple offered Lacey a way to be immortal, Blue has made Archie practically long lived (because he lives as long as Geppetto neds him which is vague), Apprentice is hundreds of years old (Around 500 years old) yet still living, yet Merlin acted as if there was no way for her to be immortal (or perhaps he doesn't like his immortality and didn't think she would like it.)