i’ve seen this compared to 2 of my favorite fantasy books ever (Emily Wilde’s Encyclopedia of Faeries and Someone You Can Build a Nest In), but sadly i ended up not liking this much.
on the positive side, this incorporates a lot of Arthurian myth/medieval-era Britain/folklore of that era, and that’s stuff i love to see used in stories. the beginning of this book when Jenny was waxing poetic about her pond was delightful.
the negative: every conflict felt like it was resolved much too quickly,

except for the really annoying third-act-breakup-esque time where Jenny, a thousand-year-old lake monster, and Temperance, a wife and mother,

act like two petty children towards each other for what feels like several chapters. that especially got old fast.

not sure where to go to hunt the Big Magic Boar? no problem, the fairy queen of the hunt will drop by for a picnic (then barely show up ever again) and explain to you every single detail of where to go and when to catch it. a bit of moral conflict between characters over whether it is okay to kill an endangered unicorn for its horn?? never fear, an elderly unicorn will conveniently come and die in your lap, fading completely away except for the horn.

the immediate solutions for nearly every situation got quite frustrating, it never felt like the characters actually struggled much at all in their quest.