Reviewers from Encyclopaedia Metallum highlight Ossian's thrash-inspired guitar riffs and the masterful keyboard work as highlights that keep the long, 10-minute tracks dynamic. Tracklist
The album's Latin subtitle translates to . Lyrically and visually, it explores themes of: Occult rituals and ancient legends. Paganism and Celtic nature worship. Dark eroticism and supernatural power. Opera IX - Reviews - Encyclopaedia Metallum Opera IX - The Black Opera
The album is composed as a conceptual "opera" divided into six distinct acts. Opera IX - The Black Opera