Utawarerumono: Vol.5 (2006)

Episodes 19-22 of the fantasy anime series. In a warring land,blood runs deep and trust wears thin. Just when Hakuoro thinks he has gained a trustworthy ally, he finds that he must defend his people against a power-hungry onslaught from an invincible mechanised force, the likes of which have never been seen in this primitive world. When Hakuoro is backed into a corner, his inner beast is unleashed and pieces of the mystery begin to unfold.