[greatfire]

Regarding Episode 17 mysterious voice actress:

Spoiler:

Hild is voiced by Takashima Gara (not Sara), who already voiced her in one game (remember, we are talking about japanese voice acting: an original voice must be kept if it is possible).
Her most recent "popular" role is Kisaki Eri, Mouri Ran's mother in Detective Conan among a few others.