Board Thread:General Discussion/@comment-4962906-20151007080647/@comment-6175354-20151007153947

Hmcooper4 wrote: And yes, I think it was the same Lady of the Lake that is responsible for leading Arthur to Excalibur (at least in some of the legends). Actually, it was a different Lady of the Lake.

Depending on the version.... the Lady of the Lake seduced Merlin, and manipulated him into training her. When powerful enough she betrayed him, by trapping him within a tree.