For starters, even though my knowledge remains fairly surface level, I can confidently say that this is *not* a book you should pick up if you want to learn more about the Eldar/Aeldari and their culture, as it very intentionally sets out to be something different. It's a Craftworld that has isolated itself from all others and, in so doing, has lost touch with Aeldari society.
Ultimately, that leads this book to feel like a generic fantasy novel wrapped in Aeldari colours, which could have been good, nonetheless, but unfortunately I found the story slow without any endearing characters to make it tolerable. It took at least half of the book for any of them to really establish their own identity, and by then I was struggling to care.
Still, I stuck with it, hoping for at least some good action or a resolution that would make everything fall into place. Alas, the action was very much glossed over, the resolution felt rushed, the revelations were lacklustre, and I continued to not care about the characters.
There was no emotional weight, no attachment, and this world's isolation meant any disaster that may befall them is ultimately inconsequential for the wider Warhammer 40K universe. The latter wouldn't be a point against the story were it not for the aforementioned lack of meaning to anything else. Only a few times did I think "oh, interesting", but those moments quickly faded due to the blandness of their surroundings.
I really can't recommend this one. A big disappointment.