The World We Left Behind is the seventh studio album by American psychedelic black metal band Nachtmystium, released in August 2014. Nachtmystium's vocalist and frontman, Blake Judd was struggling with a heroin addiction while working on the album. Judd's addiction drew public attention when he was arrested for misdemeanor theft charges, and later accused of defrauding multiple fans and business partners. Many of the album's songs include references to Judd's struggle with heroin and recovery. The album received a mixed reception.