User blog comment:Druidinhiding/Alternate Ending Theories and Thoughts/@comment-4650675-20121227214802/@comment-5674726-20121228152245

As the High Priestess of the Triple Goddess, Morgana doesn't know about the prophecy when even Gaius and Kilgharrah know about it?

That depends on what kind of prophecy it was.

If Arthur as the Once and Future King uniting Albion and restoring magic with Merlin by his side was just one of countless possible futures rather than a destiny that was set in stone, as recent events would suggest was the case, I can see why the High Priestesses wouldn't place their faith in it without question, even if other sects chose to believe in it. If that's the case, it's also possible that, while Kilgharrah tried to nudge people down the path that he believed would lead to Albion, the Triple Goddess favoured another potential future and was nudging her followers in a different direction.

Morgana has also had comparatively little training in the Old Religion compared to other High Priestesses. Morgause was trained from birth, and Nimueh was at least a couple of decades older than she looked but Morgana had, at most, one uninterrupted year with a healthy Morgause, one uninterrupted year with a dying Morgause and one year that they saw one another infrequently between plots. It stands to reason that Morgana's education in the Old Religion would have been a crash course of the things that Morgause believed were most vital for her to learn. Morgause's own education may not have been as complete as it should have been, depending on the impact of the Great Purge on the Isle of the Blessed.

If there was a prophecy, it's very possible that it was lost to Morgana's predecessors and that the knowledge of it didn't pass to her.