Released on December 31, 2015, Obscur represents a unique and highly atmospheric entry in ARIA's catalog. Departing significantly from their established reputation for high-velocity, traditional heavy metal and power metal, this 10-track album leans heavily into gothic metal, alternative metal, and progressive rock. The tracklist, featuring Spanish titles such as 'Trenzas ~tu cabello~', 'carmesí', and 'Patio de atrás', highlights a linguistic and thematic shift toward intimate, poetic, and dark romantic themes.
Sonically, the album is characterized by slower tempos, dense synth layering, and a reverb-heavy production style that emphasizes mood over raw speed. The vocals are a major focal point, delivering operatic, dramatic performances that soar over heavy, down-tuned guitar riffs. Tracks like 'SEX DRIVE' introduce a pulsing, electronic-tinged groove, while the closing track 'Aún' stretches past the seven-minute mark, showcasing the band's progressive arrangements and slow-building dynamic peaks. Obscur stands as a moody, experimental snapshot that showcases a completely different, nocturnal side of the band's musical identity.