Aparently in this series Arthur is indeed female, I liked how Merlin called her Arturia.

@Kraco, it's not a matter of knowing Shirou's skills, Ilya simply thinks that he can't do anything because of the spell (or whatever) she did on him. It seems that it should've rendered him useless, incapable of doing anything.

And I agree with Ryllharu, I think all problems will be solved with Shirou materializing the real Excaliber, or whatever that other sword was.