(n.) The art of revealing future events by means of a pretended communication with the dead; the black art; hence, magic in general; conjuration; enchantment. See Black art.
Example Sentences:
(1) They also set out a clear thrash blueprint: grow your hair, call your fan club something provocative like Slatanic Wermacht, wear denim and write songs about Nazis, necromancy and general evil stuff.
(2) Oh, you expect the usual stampede of misbehaviour; the filth and necromancy, the lying and preening.