nachtmystium=black metal skrewdriver?
Nachtmystium = suburban black metal with hilarious (and not-very-kvlt) stories about them. I was once in the back seat of a car driven by Blake "Azentrius" Judd that pulled up to the drive-thru at a KFC, and between the money window and the food window, he said something about "but we hate you because you're n*gg*rs!". Then there was that time his girlfriend walked in on him banging some other chick. Years later, they're still together and she's still painting his album covers.
And yes, he came up with the "Azentrius" name in some art class. Possibly pottery. (and yes, the racism has probably gone out the window since then, but it was present in the early, impressionable days, when "Lords of Chaos" was pretty much his bible).
Certain TOUAMBers summon the Kips of Fail to open the Nachmystinomicon and shed light on the grim and frostbitten forbidden lore of Illinois Black Metal. Tip your waitresses.