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Artist's commentary
Patreon request: Archdemon showdown with heroes
The common term for the fantasy big bad in Japanese is é”王 "Maou." It's a great word in Japanese because it's vague, flexible and easy to say, but there's no fits-all English translation for it. ("Demon King" is too long.)
Source: https://twitter.com/baalbuddy/status/1358331010711248899