Reddit mentions of Immortals' Requiem: An Epic Grimdark Fantasy

Yup, there's quite a mix. I can't say if any of them are any good and not knockoff YA as you say.... except for my book "Immortals' Requiem" which is an epic grimdark fantasy and is the exact opposite of YA fiction.

Free on the promo but reviews and details here:
https://www.amazon.com/Immortals-Requiem-Epic-Grimdark-Fantasy-ebook/dp/B07DDDVDR5/

All those authors applying were told to only join the promotion if their books fell in to the following categories FYI.

Sci-fi
Fantasy
Thriller/Suspense
Historical
Literary
Paranormal
Action/Adventure
Western