User blog comment:Emily Windsnap/Where did the Euchdag, Sefa, and Aithusa go?/@comment-78.97.13.141-20130103110718

Well this is my theory:

First of all the Euchdag was the key off all knowledge,so he knew how Arthur will die,that`s why Morgana was searching so hardly for it. Morgana was wise enough to admit she had lost it,so she abandoned his researching..well she was wondering what is he going to tell her which is Arthur`s Bane...as you know,Arthur`s Bane was himself(he made Mordred a knight-this was the first mistake).The Euchdag was lost in the Fortress of Ismere where Morgana didn`t return after her little fight with Mordred.It was a lost cause:)

"Sefa did not appear again on the show after Arthur's Bane. It is unknown what became of her after her father's death. " This is what the producers said about her, I guess she was just a poor villain, a girl who was sentenced to death,but managed to escape and fade away:)

In the legends, the red dragon - symbolising Wales, king Arthur and Christianity -  kills the white dragon - symbolising the Saxons, Morgana  and magic. The red dragon is most likely represented by Kilgharrah  and the white dragon by Aithusa. Perhaps after the battle of Camlann Aithusa got wounded by Emrys`s magic and just fade away,symbolising that the battle for Morgana and her allies was over.

These are my thoughts.Let me know what you think about them:)

Added by Dragonfire8