Board Thread:General Discussion/@comment-25758988-20151007145122/@comment-27603417-20151008015948

I think they have Norse myths in mind, but they just can't fit every classical mythology in the show. In the Season 4 DVD special, one of the "Three Who Stayed" is Freya, the Norse goddess. I know the special is not canon, but clearly, with her appearance there, we know that the creators and writers want every possible myth in the show; they just can't fit everybody in. So I'm okay with some of them appearing in special features, even though they're not canon.