Chicago's Nachtmystium initially started pushing outward on the boundaries of black metal in 2006, with the expansive, psychedelic Instinct: Decay. Their sonic explorations were intensified on 2008's magnificent and unclassifiable Assassins: Black Meddle Part 1, and exponentially more so on 2010's Addicts: Black Meddle Part 2, which drifted so far from the genre as to be something else entirely. The ...