Wiktionary
dark art
n. (alternative form of black art English)
Usage examples of "dark art".
Weapons of evil, they were called by the catalysts, demonic creations of the Dark Art of Technology.
That's why the dark art is so seductive, and it gives black wizards certain advantages.
The conjuring of strange and varied abilities-of instilling unnatural attributes in people-willing or not, had once been a dark art, the results always being at the least unpredictable, often uncertain, and sometimes dangerously unstable.