Nachtmystium is a black metal band from DeKalb, Illinois, USA that has featured members from other American black metal acts such as Weltmacht, Krieg, and Judas Iscariot.

Formed in 2000 by guitarist Blake Judd (aka Azentrius), Nachtmystium debuted with their first demo, Holocaust of Eternity , and a split with USBM band Zalnik. Their first full-length, Reign of the Malicious , was released in 2002, and since then, they have released 4 EPs, Nachtmystium (2003), Eulogy IV (2004), Worldfall (2008) and Doomsday Derelicts (2009), and 5 full-length albums, Demise (2004), Instinct: Decay (2006), Assassins: Black Meddle, Part 1 (2008), Addicts: Black Meddle Part 2 (2010) and Silencing Machine (2012). Nachtmystium has had various splits with the major USBM bands, including Xasthur and Krieg, and an upcoming split with Leviathan. A new song entitled Pitch Black Cadence has been posted on their Myspace-page.

Azentrius is the owner of Battle Kommand Records. He also is an active member in USBM supergroup Twilight.

In October 2013, Blake Judd was arrested and retained on grounds of theft, forcing the band to cancel several shows.

In November 2013, Blake Judd announced Nachtmystium's split.

The complete line-up consisted of:
Blake Judd Guitars, Vocals
Aamonael Guitars
Sanford Parker Effects, Keyboards
Charlie Fell Drums
Will Lindsay Bass
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