Nachtmystium was an American psychedelic black metal band formed by Blake Judd, formerly known as Azentrius, and Pat McCormick. The band's name is derived from the German word Nacht meaning "night", and the made-up term mystium which resembles the Latin adjective mysticum. Judd and McCormick combined the words to create the band's name, which they state means "Encompassing Darkness". After nearly a 13-year run, Judd disbanded the band in 2013. Nachtmystium released six full-length studio albums and headlined multiple concert tours.