Board Thread:Show-Related Questions and Answers/@comment-25926288-20151112042649/@comment-27971057-20151112044102

I dunno.

The Seer was in a previous season, so the writers probably didn't come up with the entire Merlin / Nimue / Holy Grail specifics at that time.

Maybe only Merlin mastered the power of foresight since he has gained a substantial amount of knowledge over the 500+ years he has lived? Even then, he stated he can only partially see the future.

What I'm more interested in is how Nimue (Dark Version) died since she seemed to be the most powerful Dark One..