« You left right at the end of Highbright. It’s the first week of Brightdusk. » look i appreciate the attempt but english is not german
you can't just stick two words together and call it a month
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english month names would be boring shit like “summer month” “harvest month” “spooky month”
in general i think fantasy authors try to make coinages which sound cool and interesting and unique; this is a MISTAKE, your coinage should sound boring and painfully obvious if you actually want to sell it as a thing people say all the time