Where does “暗黒面” come from?

暗黒面 (Japanese) comes from Japanese 面, from Old Japanese おも.

暗黒面 (Japanese): the dark, cruel side of a matter or situation;...

Definitions

  1. the dark, cruel side of a matter or situation;...

Ancestry of “暗黒面”, step by step

暗黒面 traces back through two separate lines of ancestry.

via Japanese

StepLanguageWordMeaning
1Japaneseface; surface; mask
2Old Japaneseおも

via Japanese 暗黒

StepLanguageWordMeaning
1Japanese暗黒darkness
Every word from Old Japanese おもEvery word from Japanese