High Quality Content by WIKIPEDIA articles! Nachtmystium is 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."