Wow, I was going to say that's quite the twist until I read on.

Because I could have sworn that Nael had a male's voice through 1.0 unless he just wasn't voiced at all. They made no mistake in making livia female in body as well, so I was a tad confused. Then I realized, like in dragon age, Nael's physical form is merely a manifestation of something from the void.

So as it is, that is Nael, sort of, just possessed by something or someone similar.