I thought this one was ok, and it was definitely not one of their better episodes.
It would have been nice if we'd gotten at least a little bit more information about the keys and the ship in the mines.
And what was with the kid Irisa saw? Was it literally supposed to be Irzu, or was all of it some kind of a hallucination brought about by the keys? I've never been entirely clear how literally we're supposed to take all of the Irathient spirituality.
I was disappointed to see them kill off Kenya, I've always liked Mia Kirshner. I didn't have that much of a problem with Stahma killing her though, I wouldn't have expected her to go against Datak like that.